Mode: RFC‑A
The following table shows various definitions associated with controlling the motor. In each case the paramters used and the effect are given.
Function | Parameters | Usage |
Rated Current | Rated Current (05.007) | General definition of motor rated current Motor pre-heat Motor thermal model |
Stator resistance | Stator Resistance (05.017) | Sensorless control reference frame High performance current control |
Transient inductance | Transient Inductance (05.024) | Motor flux level Sensorless control performance Voltage feed-forwards due to flux Control at voltage based torque limit of the motor High performance current control Standard performance current control cross-coupling compensation |
Rated voltage | Rated Voltage (05.009) | Flux controller gains Flux control voltage limit Stator inductance auto-tune |
Rated frequency | Rated Frequency (05.006) | Flux controller voltage control gains Motor flux level Ratio used to compensate for frequency varying gains Sensorless control minimum flux at low speeds Sensorless control flux estimate Stator inductance measurment auto-tune Sensorless control low/high speed mode thresholds |
Rated magnetising current | Rated Current (05.007) Rated Frequency (05.006) Rated Voltage (05.009) Stator Resistance (05.017) Transient Inductance (05.024) Stator Inductance (05.025) Rated Power Factor (05.010)* *Used if stator inductance is not provided. |
Motor flux level Maximum flux producing current Sensorless control minimum flux producing current limit Flux estimate including break point effects Flux ratio for torque to current conversion |
Rated torque producing current | Parameters used to define the rated magnetising current. | Flux controller gains Flux optimisation characteristic Torque reference conversion to current Slip calculation Kt calculation |
Motor poles | Number Of Motor Poles (05.011) | Position feedback phasing error checking Mechanical to electrical position conversion Stator inductance measurement auto-tune Sensorless control maximum rate of change of flux angle Sensorless control electrical to mechanical speed conversion |
Rated slip frequency | Rated Frequency (05.006) Rated Speed (05.008) Number Of Motor Poles (05.011) |
Flux controller gains Slip frequency |
Rotor electrical time constant | Parameters used to define RatedIsx, RatedIsy and RatedSlipFrequency. | Flux controller integral gain Flux estimation |
Maximum current limits | Parameters used to define the rated magnetising current. Symmetrical Current Limit (04.007) Motoring Current Limit (04.005) |
Current limit variable maximums, i.e. VM_MOTOR1_CURRENT_LIMIT. |
Motor thermal model | Motor Thermal Time Constant 1 (04.015) Thermal Protection Mode (04.016) Motor Thermal Time Constant 2 Scaling (04.038) Rated Iron Losses As Percentage Of Losses (04.039) Motor Thermal Time Constant 2 (04.037) Rated Current (05.007) Rated Frequency (05.006) |
|
Rated speed optimisation | Stator Resistance (05.017) Transient Inductance (05.024) Stator Inductance (05.025) |
Auotmatic rated speed optimisation |
Torque estimation | Stator Resistance (05.017) Transient Inductance (05.024) Stator Inductance (05.025) No-load core loss (04.045) Rated Core Loss (04.046) |
Estimated percentage torque |
Parameter | 05.001 Output Frequency | ||
---|---|---|---|
Short description | Displays the frequency applied to the motor | ||
Mode | RFC‑A | ||
Minimum | -2000.0 | Maximum | 2000.0 |
Default | Units | Hz | |
Type | 32 Bit Volatile | Update Rate | 4ms write |
Display Format | Standard | Decimal Places | 1 |
Coding | RO, FI, ND, NC, PT |
The output frequency is not controlled directly, but the Output Frequency (05.001) is a measurement of the frequency applied to the motor.
Parameter | 05.002 Output Voltage | ||
---|---|---|---|
Short description | Displays the r.m.s. line to line voltage at the a.c. terminals of the drive | ||
Mode | RFC‑A | ||
Minimum | −VM_AC_VOLTAGE | Maximum | VM_AC_VOLTAGE |
Default | Units | V | |
Type | 16 Bit Volatile | Update Rate | 4ms write |
Display Format | Standard | Decimal Places | 0 |
Coding | RO, FI, VM, ND, NC, PT |
The Output Voltage (05.002) is the r.m.s. line to line voltage at the a.c. terminals of the drive.
Parameter | 05.003 Output Power | ||
---|---|---|---|
Short description | Displays the power flowing via the a.c. terminals of the drive | ||
Mode | RFC‑A | ||
Minimum | −VM_POWER | Maximum | VM_POWER |
Default | Units | kW | |
Type | 32 Bit Volatile | Update Rate | 4ms write |
Display Format | Standard | Decimal Places | 3 |
Coding | RO, FI, VM, ND, NC, PT |
The Output Power (05.003) is the power flowing via the a.c. terminals of the drive. The power is derived as the dot product of the output voltage and current vectors, and so this is correct even if the motor parameters are incorrect and the motor model does not align the reference frame with the flux axis of a motor in RFC-A mode. For Open-loop, RFC-A and RFC-S modes a positive value of power indicates power flowing from the drive to motor. For Regen mode a positive value of power indicates power flowing from the supply to the regen drive.
Parameter | 05.005 D.c. Bus Voltage | ||
---|---|---|---|
Short description | Displays the voltage across the d.c. link of the drive | ||
Mode | RFC‑A | ||
Minimum | −VM_DC_VOLTAGE | Maximum | VM_DC_VOLTAGE |
Default | Units | V | |
Type | 16 Bit Volatile | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RO, FI, VM, ND, NC, PT |
D.c. Bus Voltage (05.005) gives the voltage across the d.c. link of the drive.
Parameter | 05.006 Rated Frequency | ||
---|---|---|---|
Short description | Set to the rated frequency of the motor | ||
Mode | RFC‑A | ||
Minimum | 0.0 | Maximum | 550.0 |
Default | See exceptions below | Units | Hz |
Type | 16 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 1 |
Coding | RW |
Region | Default Value |
50Hz | 50.0 |
60Hz | 60.0 |
Rated Frequency (05.006), Rated Speed (05.008) and Number Of Motor Poles (05.011) are used to calculate the rated slip of the motor which is used by the motor control algorithm. An incorrect estimate of rated slip has the following effects:
The rated speed on the motor nameplate is normally the value for a hot motor, however, some adjustment may be required when the drive is commissioned if this is inaccurate. Either a fixed value can be entered for Rated Speed (05.008) or the optimisation system within the drive may be used to automatically adjust the Rated Speed (05.008). See Rated Speed Optimisation Select (05.016). It should be noted that the optimisation system does not operate when sensorless RFC-A mode is used (i.e. Sensorless Mode Active (03.078) = 1).
Parameter | 05.007 Rated Current | ||
---|---|---|---|
Short description | Set to the rated current rated of the motor | ||
Mode | RFC‑A | ||
Minimum | −VM_RATED_CURRENT | Maximum | VM_RATED_CURRENT |
Default | 0.000 | Units | A |
Type | 32 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 3 |
Coding | RW, VM, RA |
Rated Current (05.007) is used as follows:
Parameter | 05.008 Rated Speed | ||
---|---|---|---|
Short description | Set to the rated speed of the motor | ||
Mode | RFC‑A | ||
Minimum | 0.00 | Maximum | 33000.00 |
Default | See exceptions below | Units | rpm |
Type | 32 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 2 |
Coding | RW |
Region | Default Value |
50Hz | 1500.00 |
60Hz | 1800.00 |
Parameter | 05.009 Rated Voltage | ||
---|---|---|---|
Short description | Set to the rated voltage of the motor | ||
Mode | RFC‑A | ||
Minimum | −VM_AC_VOLTAGE_SET | Maximum | VM_AC_VOLTAGE_SET |
Default | See exceptions below | Units | V |
Type | 16 Bit User Save | Update Rate | 4ms read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW, VM, RA |
Voltage | Region | Default Value |
200V | All | 230 |
400V | 50Hz | 400 |
400V | 60Hz | 460 |
575V | All | 575 |
690V | All | 690 |
The Rated Voltage (05.009) is the maximum continuous voltage that is applied to the motor. Normally this should be set to the motor nameplate value. If the drive is supplied through its own diode rectifier the maximum possible output voltage is just below the supply voltage level, and so the output voltage will not reach Rated Voltage (05.009) if this is equal to or above the supply voltage. If high transient performance is required at higher speeds then Rated Voltage (05.009) should be set to 95% of the minimum d.c. link voltage divided by √2 to allow some headroom for the drive to control the motor current. If the drive is fed through its own diode rectifier the minimum d.c. link voltage is approximately supply voltage x √2.
In some cases it may be necessary to set the Rated Voltage (05.009) to a value other than the motor nameplate value. If this is the case the Rated Frequency (05.006) and Rated Speed (05.008) should be set up as follows:
K = Rated Voltage (05.009) / motor rated voltage
Rated Frequency (05.006) = motor rated frequency x K
Rated Speed (05.008) = motor rated speed + [(K - 1) x motor rated frequency x 60 / (number of motor poles / 2)]
The Rated Voltage (05.009), Rated Frequency (05.006) and Number Of Motor Poles (05.011) are used during the auto-tuning process to determine the flux level required in the motor for normal operation. Therefore if the Rated Voltage (05.009) is set to a value other than the nameplate value and the above adjustment is not applied the motor may be under or over-fluxed
Parameter | 05.010 Rated Power Factor | ||
---|---|---|---|
Short description | Set to the rated power factor of the motor. This value can be measured by the drive during a rotating autotune. | ||
Mode | RFC‑A | ||
Minimum | 0.000 | Maximum | 1.000 |
Default | 0.850 | Units | |
Type | 16 Bit User Save | Update Rate | Background read/write |
Display Format | Standard | Decimal Places | 3 |
Coding | RW, RA |
Rated Power Factor (05.010) is the true power factor of the motor under rated conditions, i.e. the cosine of the angle between the motor voltage and current. If Stator Inductance (05.025) is set to a non-zero value then the stator inductance is used to calculate the rated magnetising current for the motor and the rated power factor can be calculated by the drive. Therefore if Stator Inductance (05.025) is non-zero Rated Power Factor (05.010) is continuously set to the calculated value of rated power factor by the drive. If Stator Inductance (05.025) is set to zero then Rated Power Factor (05.010) is used to estimate the rated magnetising current which is an approximation and not as accurate. Stator Inductance (05.025) can be measured by the drive during auto-tuning and this is the preferred option, however, if it is not possible to obtain the value for Stator Inductance (05.025) then Rated Power Factor (05.010) should be set to the motor nameplate value.
Parameter | 05.011 Number Of Motor Poles | ||
---|---|---|---|
Short description | Set to the number of poles of the motor | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 240 |
Default | 0 | Units | PolePairs |
Type | 8 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW, BU |
* The units relate to the text string of the parameter and not the numeric value.
The numeric value in Number Of Motor Poles (05.011) should be set to the number of motor pole pairs (i.e. number of motor poles / 2). The text strings associated with Number Of Motor Poles (05.011) show the number of motor poles (i.e. the parameter value x 2). If a linear position feedback device is used Number Of Motor Poles (05.011) should be set to 1 (2 Pole).
If Number Of Motor Poles (05.011) = 0 the number of motor poles are calculated automatically as given below.
Pole pairs = 60 x Rated Frequency (05.006) / Rated Speed (05.008) rounded down to the nearest integer.
Parameter | 05.012 Auto-tune | ||
---|---|---|---|
Short description | Defines the auto-tune test to be performed | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 5 |
Default | 0 | Units | |
Type | 8 Bit Volatile | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW, NC |
The following describes how an auto-tune test can be initiated and normal operation can be resumed after the test for RFC-A mode:
The following describes the effects of the auto-tune test on the drive parameters for RFC-A mode:
The table below shows the parameters required for motor control indicating which should be set by the user and which can be measured with an auto-tune test.
*Torque feedback is provided in Percentage Torque (04.026). The estimated value can be improved by setting up the No-load Core Loss (04.045) and Rated Core Loss (04.046) for the motor. It should be noted that the core loss characteristic for a motor is complex and depends to some extent on the switching frequency, but the drive can include an approximation to the core losses based on these two parameters. The value for the no-load core losses measured by the auto-tuning is likely to be higher than the actual value, but can be used to significantly reduce the difference that will be seen in the estimate torque between motoring and regenerating operation. If more accurate core loss compensation is required No-load Core Loss (04.045) and Rated Core Loss (04.046) must be set up based on testing the motor using a torque transducer.
Auto-tune test 1: Basic control parameters
This test measures the basic control parameters without moving the motor.
Auto-tune test 2: Basic control and improved performance parameters
This test measures the parameters for improved performance by rotating the motor.
Auto-tune test 3: Mechanical load measurement using signal injection
This test measures the mechanical characteristic of the motor and load by rotating the motor at the speed defined by the present speed reference and injecting a series of speed test signals. This test should only be used provided all the basic control parameters have been set-up correctly and the speed controller parameters should be set to conservative levels, such as the default values, so that the motor is stable when it runs. The test measures the motor and load inertia, which can be used in automatic set-up of the speed controller gains and in producing a torque feed-forward term. If Mechanical Load Test Level (05.021) is left at its default value of zero then the peak level of the injection signal will be 1% of the maximum speed reference subject to a maximum of 500rpm. If a different test level is required then Mechanical Load Test Level (05.021) should be set to a non-zero value to define the level as a percentage of the maximum speed reference, again subject to a maximum of 500rpm. The user defined speed reference which defines the speed of the motor should be set to a level higher than the test level, but not high enough for flux weakening to become active. In some cases however, it is possible to perform the test at zero speed provided the motor is free to move, but it may be necessary to increase the test signal from the default value. The test will give the correct results when there is a static load applied to the motor and in the presence of mechanical damping. This test should be used if possible, however for sensorless mode, or if the speed controller cannot be set up for stable operation an alternative test is provided (Auto-tune (05.012) = 4 ) where a series of torque levels are applied to accelerate and decelerate the motor to measure the inertia.
Auto-tune test 4: Mechanical load measurement using applied torque
Auto-tune test 3 should normally be used for mechanical load measurement, but under some circumstances this test may be used as an alternative. This test will not give such accurate results as test 3 if the motor rated speed is not set to the correct value for the motor. Also this test is likely to give incorrect results if standard ramp mode is active. A series of progressively larger torque levels are applied to the motor (20%, 40% ... 100% of rated torque) to accelerate the motor up to 3/4 x Rated Speed (05.008) to determine the inertia from the acceleration/deceleration time. The test attempts to reach the required speed within 5s, but if this fails the next torque level is used. When 100% torque is used the test allows 60s for the required speed to be reached, but if this is unsucessful a trip is initiated. To reduce the time taken for the test it is possible to define the level of torque to be used for the test by setting Mechanical Load Test Level (05.021) to a non-zero value. When the test level is defined the test is only carried out at the defined test level and 60s is allowed for the motor to reached the required speed. It should be noted that if the maximum speed allows for flux weakening then it may not be possible to acheive the required torque level to accelerate the motor fast enough. If this is the case, the maximum speed reference should be reduced.
Auto-tune test 5:
To be defined.
The table below shows the trips that can occur during an auto-tune test:
Trip | Reason |
Autotune Stopped | The final drive enable or the final drive run were removed before the test was completed. |
Resistance.001 | The measured value of Stator Resistance (05.017) exceeded a value of (VFS / √2) / Full Scale Current Kc (11.061), where VFS is the full scale d.c. link voltage. |
Resistance.002 | It has not been possible to measure the drive inverter characteristic to define Maximum Deadtime Compensation (05.059) and Current At Maximum Deadtime Compensation (05.060). |
Autotune 1.001 |
The position feedback did not change when position feedback is being used. |
Autotune 1.002 |
The motor did not reach the required speed. |
Autotune 1.008 |
An auto-tune has been attempted while the AMC is selected. |
Autotune 2.001 | Position feedback direction is incorrect when position feedback is being used. |
Autotune 2.002 |
A SINCOS encoder with comms is being used for position feedback and the comms position is rotating in the opposite direction to the sine wave based position. |
Autotune 3.001 | The measured inertia exceeds the parameter range. |
Autotune 3.003 | The mechanical load test has failed to identify the inertia. |
Autotune 7 | The motor poles or the position feedback resolution have been set up incorrectly where position feedback is being used. The trip will not occur if Number Of Motor Poles (05.011) ≥ 6 (i.e. 12 poles). |
If Sensorless Mode Active (03.078) = 1 then trips Autotune 1 (except Autotune 1.008), Autotune 2 and Autotune 7 are disabled.
Parameter | 05.013 Flux Optimisation Select | ||
---|---|---|---|
Short description | Set to 1 to enable Flux Optimisation | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 1 |
Default | 0 | Units | |
Type | 1 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
If Flux Optimisation Select (05.013) = 0 the rated level of flux is used in the motor when flux weakening is not active. If Flux Optimisation Select (05.013) = 1 the flux is reduced so that the Id, Magnetising Current (04.017) is approximately equal to the Iq, Torque Producing Current (04.002) to optimise copper losses and reduce iron losses in the motor under low load conditions. The flux can be reduced from the rated level down to half the rated level. This feature is not available with sensorless mode (i.e. when Sensorless Mode Active (03.078) = 1).
Parameter | 05.015 Low Frequency Voltage Boost | ||
---|---|---|---|
Short description | Defines the level of low voltage boost when performing auto-tune test 2 | ||
Mode | RFC‑A | ||
Minimum | 0.0 | Maximum | 25.0 |
Default | 3.0 | Units | % |
Type | 8 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 1 |
Coding | RW, BU |
The default value for this parameter depends on the frame size of the drive as follows:
During auto-tune test 2 the drive uses the Open-loop mode control strategy with fixed voltage boost. Low Frequency Voltage Boost (05.015) is used to define the level of low voltage boost used during the test. See Open-loop Control Mode (05.014) in Open-loop mode for more details.
Parameter | 05.016 Rated Speed Optimisation Select | ||
---|---|---|---|
Short description | Rated Speed Optimisation Select | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 5 |
Default | 0 | Units | |
Type | 8 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW, TE |
Value | Text |
0 | Disabled |
1 | Classic Slow |
2 | Classic Fast |
3 | Combined |
4 | VARs Only |
5 | Voltage Only |
The Rated Frequency (05.006) and Rated Speed (05.008) are used to define the rated slip of the motor. The rated slip is used in sensorless mode (Sensorless Mode Active (03.078) = 1) to correct the motor speed with load. When this mode is active Rated Speed Optimisation Select (05.016) has no effect.
If sensorless mode is not active (Sensorless Mode Active (03.078) = 0) the rated slip is used in the motor control algorithm and an incorrect value of slip can have a significant effect on the motor performance. If Rated Speed Optimisation Select (05.016) = 0 then the adaptive control system is disabled. However, if Rated Speed Optimisation Select (05.016) is set to a non-zero value the drive can automatically adjust the Rated Speed (05.008) to give the correct value of rated slip. Rated Speed (05.008) is not saved at power-down, and so when the drive is powered-down and up again it will return to the last value saved by the user. The rate of convergence and the accuracy of the adaptive controller reduces at low output frequency and low load. The minimum frequency is defined as a percentage of Rated Frequency (05.006) by Rated Speed Optimisation Minimum Frequency (05.019). The minimum load is defined as a percentage of rated load by Rated Speed Optimisation Minimum Load (05.020). The adaptive controller is enabled when a motoring or regenerative load rises above Rated Speed Optimisation Minimum Load (05.020) + 5%, and is disabled again when it falls below Rated Speed Optimisation Minimum Load (05.020). For best optimisation results the correct values of Stator Resistance (05.017), Transient Inductance (05.024), Stator Inductance (05.025), Saturation Breakpoint 1 (05.029), Saturation Breakpoint 2 (05.062), Saturation Breakpoint 3 (05.030) and Saturation Breakpoint 4 (05.063) should be used.
A number of different adaptive control methods can be selected as follows:
Rated Speed Optimisation Select (05.016) | Adaptive Method |
0 - Disabled | None |
1 - Classic Slow | VARs at low speed and vsy at higher speeds with low adaptive gain |
2 - Classic Fast | VARs at low speed and vsy at higher speeds with high adaptive gain |
3 - Combined | VARs when flux weakening is not active, vsy when flux weakening is active with medium adaptive gain |
4 - VARs | VARs with medium adaptive gain |
5 - Vsy | vsy with medium adaptive gain |
The classic methods normally operate correctly, but can diverge from the corrected rated speed especially with regenerative operation. These are provided for legacy applications. The "Combined" method is the preferred method as this is more robust against divergence. However the VARs method can be affected if the value of Transient Inductance (05.024) used by the drive is incorrect for the motor. It is possible to select the VARs or vsy methods alone if required. All except the "Classic Slow" adaptive method use high adaptive gain which gives faster convergence.
Parameter | 05.017 Stator Resistance | ||
---|---|---|---|
Short description | Defines the resistance of the motor stator | ||
Mode | RFC‑A | ||
Minimum | 0.000000 | Maximum | 1000.000000 |
Default | 0.000000 | Units | Ω |
Type | 32 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 6 |
Coding | RW, RA |
The Stator Resistance (05.017), Transient Inductance (05.024) and Stator Inductance (05.025) are derived from the star connected per phase equivalent circuit of an induction motor shown below.
The steady state parameters are converted to equivalent transient model parameters:
Rs = R1
Lm = Lm
Ls = L1 + Lm
Lr = L2 + Lm
σLs = Ls - (Lm2 / Lr)
The equivalent drive parameters are:
Stator Resistance (05.017) = Rs
Transient Inductance (05.024) = σLs
Stator Inductance (05.025) = Ls
Parameter | 05.018 Maximum Switching Frequency | ||
---|---|---|---|
Short description | Defines the maximum switching frequency that can be used by the drive | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | VM_SWITCHING_FREQUENCY |
Default | 1 | Units | kHz |
Type | 8 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW, TE, VM, RA |
Value | Text |
0 | 2 |
1 | 3 |
2 | 4 |
3 | 6 |
4 | 8 |
5 | 12 |
6 | 16 |
Maximum Switching Frequency (05.018) should be set to the required PWM switching frequency. The drive inverter will operate at this frequency unless the inverter temperature becomes too hot. Under these conditions the drive will reduce the switching frequency in an attempt to avoid tripping (see Auto-switching Frequency Change (05.035) ). The actual switching frequency is shown in Switching Frequency (05.037). The switching frequency has a direct effect on the sample rate for the current controllers (see Current Controller Kp Gain (04.013)). All other control tasks are at a fixed rate.
Task | |
Speed controller (RFC-A, RFC-S) | 250μs |
D.c. link voltage controller | 1ms |
Flux controller (RFC-A, RFC-S) | 1ms |
Parameter | 05.019 Rated Speed Optimisation Minimum Frequency | ||
---|---|---|---|
Short description | Rated Speed Optimisation Minimum Frequency | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 100 |
Default | 10 | Units | % |
Type | 8 Bit User Save | Update Rate | Background Read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
See Rated Speed Optimisation Select (05.016).
Parameter | 05.020 Rated Speed Optimisation Minimum Load | ||
---|---|---|---|
Short description | Rated Speed Optimisation Minimum Load | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 100 |
Default | 50 | Units | % |
Type | 8 Bit User Save | Update Rate | Background Read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
See Rated Speed Optimisation Select (05.016).
Parameter | 05.021 Mechanical Load Test Level | ||
---|---|---|---|
Short description | Mechanical Load Test Level | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 100 |
Default | 0 | Units | % |
Type | 8 Bit User Save | Update Rate | Background Read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
See Auto-tune (05.012).
Parameter | 05.023 D.c. Bus Voltage High Range | ||
---|---|---|---|
Short description | Displays the d.c. bus level but with a higher range | ||
Mode | RFC‑A | ||
Minimum | −VM_HIGH_DC_VOLTAGE | Maximum | VM_HIGH_DC_VOLTAGE |
Default | Units | V | |
Type | 16 Bit Volatile | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RO, FI, VM, ND, NC, PT |
D.c. Bus Voltage High Range (05.023) provides voltage feedback that has lower resolution and a higher range than D.c. Bus Voltage (05.005), and so it is possible to determine the d.c. link voltage even if this exceeds the level of the over-voltage trip. It should be noted that due to tolerances, D.c. Bus Voltage High Range (05.023) may not correspond exactly with the level given by D.c. Bus Voltage (05.005). In a system with parallel power modules where the control pod is remote from any of the power modules, this parameter always shows zero.
Parameter | 05.024 Transient Inductance | ||
---|---|---|---|
Short description | Defines the inducatance of the transient components in the motor stator | ||
Mode | RFC‑A | ||
Minimum | 0.000 | Maximum | 500.000 |
Default | 0.000 | Units | mH |
Type | 32 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 3 |
Coding | RW, RA |
See Stator Resistance (05.017).
Parameter | 05.025 Stator Inductance | ||
---|---|---|---|
Short description | Defines the inductance of the motor stator | ||
Mode | RFC‑A | ||
Minimum | 0.00 | Maximum | 5000.00 |
Default | 0.00 | Units | mH |
Type | 32 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 2 |
Coding | RW, RA |
See Stator Resistance (05.017).
Parameter | 05.026 High Dynamic Performance Enable | ||
---|---|---|---|
Short description | Set to 1 to enable High Dynamic Performance | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 1 |
Default | 0 | Units | |
Type | 1 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
Whatever the value of High Dynamic Performance Enable (05.026) a feed-forward term based on the estimated level of flux in the motor and the motor speed is used to improve the performance of the current controllers and to avoid transients during spinning start. However, if High Dynamic Performance Enable (05.026) = 1 additional feed-forward terms are provided to remove the effects of cross-coupling between the flux and torque axes. This improves the performance of the current controllers under dynamic conditions at high speeds. It should be noted that High Dynamic Performance Enable (05.026) has no effect if sensorless control is active (i.e. Sensorless Mode Active (03.078) = 1).
Parameter | 05.027 Flux Control Gain | ||
---|---|---|---|
Short description | Flux Control Gain | ||
Mode | RFC‑A | ||
Minimum | 0.1 | Maximum | 10.0 |
Default | 1.0 | Units | |
Type | 8 Bit User Save | Update Rate | Background Read |
Display Format | Standard | Decimal Places | 1 |
Coding | RW |
If Flux Control Gain (05.027) is set to the default value of unity the system that controls the flux and motor voltage is automatically set up based on the motor parameters to give stable operation under most conditions. However, with high speed operation it may be necessary to increase the gain of the motor voltage limit controller, and this can be done with Flux Control Gain (05.027).
Parameter | 05.028 Flux Compensation | ||
---|---|---|---|
Short description | Determines the method used for flux compensation | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 2 |
Default | 0 | Units | |
Type | 8 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
To maintain the system gain if speed control is being used, or to maintain the correct relationship between the torque reference and the actual torque, the conversion from Final Torque Reference (04.003) to Final Current Reference (04.004) normally includes the level of flux in the motor. If Flux Compensation (05.028) is left at its default value of 0, the drive uses an estimate of motor flux to perform the conversion. This is the preferred method of operation. There can be stability problems especially at very high speeds under some circumstances and Flux Compensation (05.028) can be used to change the method of compensation to overcome the issues. If Flux Compensation (05.028) = 1, then torque to torque producing current compensation is disabled altogether. This can be used for example, if Rated Speed (05.008) is set up incorrectly. If Flux Compensation (05.028) = 2, Final Current Reference (04.004) = Final Torque Reference (04.003) x Rated Frequency (05.006) / |Output Frequency (05.001)|. This is not as accurate as using the calculated flux, and does not boost the torque on starting as the flux is increased in the motor, but it reduces the likelihood of instability at high speeds and high levels of flux weakening.
Parameter | 05.029 Saturation Breakpoint 1 | ||
---|---|---|---|
Short description | Defines Saturation Breakpoint 1 within the saturation characteristic | ||
Mode | RFC‑A | ||
Minimum | 0.0 | Maximum | 100.0 |
Default | 50.0 | Units | % |
Type | 16 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 1 |
Coding | RW |
The relationship between the Id, Magnetising Current (04.017) and the motor flux is non-linear because of saturation. For accurate control of torque and good dynamic performance when flux weakening is active it is important that the control system can estimate the flux level from the Id, Magnetising Current (04.017). The saturation characteristic is provided with a set of breakpoints as shown below.
The default values for the breakpoints are Saturation Breakpoint 1 (05.029) = 50.0%, Saturation Breakpoint 2 (05.062) = 0.0%, Saturation Breakpoint 3 (05.030) = 75.0% and Saturation Breakpoint 4 (05.063) = 0.0%. For compatibility with Unidrive SP, Saturation Breakpoint 2 (05.062) and Saturation Breakpoint 4 (05.063) are ignored if they are left at their default values of 0.0%. Therefore the default values give a linear relationship between the Id, Magnetising Current (04.017) and the flux. The required values are not normally available from the motor manufacturer and should be obtained by auto-tuning.
Parameter | 05.030 Saturation Breakpoint 3 | ||
---|---|---|---|
Short description | Defines Saturation Breakpoint 3 within the saturation characteristic | ||
Mode | RFC‑A | ||
Minimum | 0.0 | Maximum | 100.0 |
Default | 75.0 | Units | % |
Type | 16 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 1 |
Coding | RW |
See Saturation Breakpoint 1 (05.029).
Parameter | 05.031 Voltage Controller Gain | ||
---|---|---|---|
Short description | Defines the proportional gain of the d.c. link voltage controller | ||
Mode | RFC‑A | ||
Minimum | 1 | Maximum | 30 |
Default | 1 | Units | |
Type | 8 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
Voltage Controller Gain (05.031) can be used to modify the proportional gain of the d.c. link voltage controller used for standard ramp and supply loss control.
Parameter | 05.032 Torque Per Amp | ||
---|---|---|---|
Short description | Displays the calculated value of kt for the attached motor | ||
Mode | RFC‑A | ||
Minimum | 0.00 | Maximum | 500.00 |
Default | Units | Nm/A | |
Type | 16 Bit Volatile | Update Rate | Background write |
Display Format | Standard | Decimal Places | 2 |
Coding | RO, ND, NC, PT, BU |
Torque Per Amp (05.032) is automatically calculated from the motor parameters assuming a motor efficiency of 90%.
Torque Per Amp (05.032) = Estimated rated shaft power / [Rated Speed (05.008) x ITRated]
where
ITRated is the rated torque producing current
and
Estimated rated shaft power = √3 x Rated Voltage (05.009) x Rated Current (05.007) x Rated Power Factor (05.010) x 0.9
Torque Per Amp (05.032) is used in the automatic calculation of the speed controller gains. See Speed Controller Set-up Method (03.017).
Parameter | 05.034 Percentage Flux | ||
---|---|---|---|
Short description | Displays the flux level in the motor | ||
Mode | RFC‑A | ||
Minimum | 0.0 | Maximum | 150.0 |
Default | Units | % | |
Type | 16 Bit Volatile | Update Rate | Background write |
Display Format | Standard | Decimal Places | 1 |
Coding | RO, FI, ND, NC, PT |
Percentage Flux (05.034) gives an indication of the flux level in the motor where a value of 100% is equivalent to the rated flux level for the motor.
Parameter | 05.035 Auto-switching Frequency Change | ||
---|---|---|---|
Short description | Defines auto-switching frequency control with thermal model | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 2 |
Default | 0 | Units | |
Type | 8 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW, TE |
Value | Text |
0 | Enabled |
1 | Disabled |
2 | No Ripple Detect |
The drive inverter can be damaged if the temperature is too high. The inverter can also be damaged or the lifetime of the power devices reduced, if the temperature ripple of the devices is too high. Auto-switching Frequency Change (05.035) defines the action taken if the drive inverter becomes too hot or the temperature ripple becomes too high.
Enabled:
If the inverter becomes too hot or the ripple temperature is higher than the level defined by Maximum Inverter Temperature Ripple (05.039) the switching frequency is reduced in an attempt to prevent tripping.
Disabled:
The switching frequency is not reduced, and so the drive will trip if the inverter is too hot or the temperature ripple is too high.
No Ripple Detect:
The switching frequency is reduced if the inverter temperature, but not the temperature ripple is too high. If the temperature ripple exceeds the level defined by Maximum Inverter Temperature Ripple (05.039) then the drive will trip.
The switching frequency is changed in steps defined by Auto-switching Frequency Step Size (05.036). For example with a switching frequency of 16kHz and a step size of two, the frequency will be reduced to 8kHz, then 4kHz etc. Minimum Switching Frequency (05.038) defines the minimum switching frequency that the system will attempt to use. If the switching frequency needs to switch to a lower level, then the drive will trip. If Minimum Switching Frequency is changed the new value will only become active when Switching Frequency is at or above the minimum value.
Parameter | 05.036 Auto-switching Frequency Step Size | ||
---|---|---|---|
Short description | Auto-switching frequency redcution step size | ||
Mode | RFC‑A | ||
Minimum | 1 | Maximum | 2 |
Default | 2 | Units | |
Type | 8 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
See Auto-switching Frequency Change (05.035).
Parameter | 05.037 Switching Frequency | ||
---|---|---|---|
Short description | Displays the current switching frequency used by the drive | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 6 |
Default | Units | kHz | |
Type | 8 Bit Volatile | Update Rate | Background write |
Display Format | Standard | Decimal Places | 0 |
Coding | RO, TE, ND, NC, PT |
Value | Text |
0 | 2 |
1 | 3 |
2 | 4 |
3 | 6 |
4 | 8 |
5 | 12 |
6 | 16 |
Shows the actual inverter switching frequency after the auto-change function.
Parameter | 05.038 Minimum Switching Frequency | ||
---|---|---|---|
Short description | Minuimum Switching Frequency | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | VM_MIN_SWITCHING_FREQUENCY |
Default | 0 | Units | kHz |
Type | 8 Bit User Save | Update Rate | Background Read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW, TE, VM |
Value | Text |
0 | 2 |
1 | 3 |
2 | 4 |
3 | 6 |
4 | 8 |
5 | 12 |
6 | 16 |
See Auto-switching Frequency Change (05.035).
Parameter | 05.039 Maximum Inverter Temperature Ripple | ||
---|---|---|---|
Short description | Maximum Inverter Temperature Ripple | ||
Mode | RFC‑A | ||
Minimum | 20 | Maximum | 60 |
Default | 60 | Units | °C |
Type | 8 Bit User Save | Update Rate | Background Read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
Maximum Inverter Temperature Ripple (05.039) defines the maximum inverter temperature ripple allowed before the switching frequency is reduced. See Auto-switching Frequency Change (05.035).
Parameter | 05.040 Spin Start Boost | ||
---|---|---|---|
Short description | Defines the level of spin start boost used by the algorithm that detects the speed of a spinning motor | ||
Mode | RFC‑A | ||
Minimum | 0.0 | Maximum | 10.0 |
Default | 1.0 | Units | |
Type | 8 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 1 |
Coding | RW |
Spin Start Boost (05.040) is used by the algorithm that detects the speed of a spinning motor when the drive is enabled and Catch A Spinning Motor (06.009) ≥ 1. This algorithm is not used if position feedback is being used, and so in these applications Spin Start Boost (05.040) has no effect. For most motors Spin Start Boost (05.040) does not need to be changed from the default value, but for some larger motors Spin Start Boost (05.040) may need to be increased. If Spin Start Boost (05.040) is too small the drive will detect zero speed whatever the speed of the motor, and if Spin Start Boost (05.040) is too large the motor may accelerate away from standstill when the drive is enabled.
Parameter | 05.041 Voltage Headroom | ||
---|---|---|---|
Short description | Voltage Headroom | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 20 |
Default | 0 | Units | % |
Type | 8 Bit User Save | Update Rate | Background Read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
The voltage applied to the motor is always limited by Rated Voltage (05.009). When Voltage Headroom (05.041) is set to its default value of zero the output voltage of the inverter is also limited to a level equivalent to full modulation, which is the supply voltage minus voltage drops within the inverter itself. Depending on the relative values of the supply voltage and Rated Voltage (05.009) there may be some headroom between the rated voltage limit and the maximum possible voltage from the inverter to allow the current control system to give good dynamic performance. In some applications it is useful to enforce some headroom between the maximum allowed motor voltage and the inherent limit imposed by the inverter. If the supply voltage is known this can be done by setting Rated Voltage (05.009) to a suitable value below the supply voltage level, however, it is more convenient to set Rated Voltage (05.009) to the actual rated voltage of the motor, and to use Voltage Headroom (05.041) to enforce the voltage headroom. This parameter can be used to increase the headroom between the maximum modulation limit and the maximum motor voltage from zero up to 20% of the maximum modulation limit. For example, if the supply voltage is 400V then a value of 10% will give a voltage headroom of approximately 40V.
Parameter | 05.042 Reverse Output Phase Sequence | ||
---|---|---|---|
Short description | Set to 1 to reverse the sequence on the output phases | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 1 |
Default | 0 | Units | |
Type | 1 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
If Reverse Output Phase Sequence (05.042) = 0 the output phase sequence is U-V-W when Output Frequency (05.001) is positive and W-V-U when Output Frequency (05.001) is negative. If Reverse Output Phase Sequence (05.042) = 1 the output phase sequence is reversed so that the phase sequence in W-V-U for positive frequencies and U-V-W for negative frequencies.
Parameter | 05.044 Stator Temperature Source | ||
---|---|---|---|
Short description | Defines the source of the stator temperature | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 6 |
Default | 1 | Units | |
Type | 8 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW, TE |
Value | Text |
0 | An In 3 |
1 | User |
2 | P1 Drive |
3 | P1 Slot1 |
4 | P1 Slot2 |
5 | P1 Slot3 |
6 | P1 Slot4 |
The stator temperature can be used to compensate for changes in stator resistance. See Stator Temperature Coefficient (05.047). Stator Temperature Source (05.044) is used to select the source for the stator temperature measurement.
Stator Temperature Source (05.044) | Source | Comments |
0 | Analog Input 3 Thermistor Temperature (07.050) | Analog input 3 must be set up for the correct temperature feedback device |
1 | User Stator Temperature (05.045) | The user can provide a stator temperature value. If an alternative feedback device is to be used or the user provides an algorithm to model the stator temperature. |
2 | P1 Thermistor Temperature (03.122) | P1 position feedback interface must be set up for the correct temperature feedback device |
3-6 | Option slot P1 Thermistor Temperature (xx.080) | A position feedback category option module must be fitted and the P1 position feedback must be set up for the correct temperature feedback device |
Parameter | 05.045 User Stator Temperature | ||
---|---|---|---|
Short description | Defines the stator temperature as set by the user | ||
Mode | RFC‑A | ||
Minimum | -50 | Maximum | 300 |
Default | 0 | Units | °C |
Type | 16 Bit Volatile | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
See Stator Temperature Source (05.044).
Parameter | 05.046 Stator Temperature | ||
---|---|---|---|
Short description | Displays the temperature of the motor stator | ||
Mode | RFC‑A | ||
Minimum | -50 | Maximum | 300 |
Default | Units | °C | |
Type | 16 Bit Volatile | Update Rate | Background write |
Display Format | Standard | Decimal Places | 0 |
Coding | RO, ND, NC, PT |
See Stator Temperature Source (05.044).
Parameter | 05.047 Stator Temperature Coefficient | ||
---|---|---|---|
Short description | Defines the coefficient used to calculate the temperature of the motor stator | ||
Mode | RFC‑A | ||
Minimum | 0.00000 | Maximum | 0.10000 |
Default | 0.00390 | Units | 1/°C |
Type | 16 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 5 |
Coding | RW |
Temperature Compensated Stator Resistance (05.050) shows the stator resistance from the active motor that is being used by the drive for motor control. If Enable Stator Compensation (05.049) = 0 and motor 1 is selected then Temperature Compensated Stator Resistance (05.050) is equal to Stator Resistance (05.017). If Enable Stator Compensation (05.049) = 1 the value of Stator Resistance (05.017) is not changed, but Temperature Compensated Stator Resistance (05.050) is derived as follows:
Temperature Compensated Stator Resistance (05.050) = Stator Resistance (05.017) x [1 + ((Stator Temperature (05.046) – Stator Base Temperature (05.048)) x Stator Temperature Coefficient (05.047))]
Stator Resistance (05.017) and Stator Base Temperature (05.048) can be set up by the user with the stator resistance at a given temperature. The preferred method is for the Stator Resistance (05.017) to be measured and set up using the auto-tuning system (See Auto-tune (05.012)). If Enable Stator Compensation (05.049) = 1 when the auto-tuning is carried out the Stator Base Temperature (05.048) will be updated automatically with Stator Temperature (05.046).
The temperature compensation system can only function correctly if the Stator Temperature Coefficient (05.047) is set up correctly. The default value is suitable for copper or aluminium windings and should not need to be adjusted for these materials provided the temperature measurement is a reasonable measure of the winding temperature. If the temperature measurement is not closely coupled to the winding it may be necessary to adjust Stator Temperature Coefficient (05.047) for correct compensation.
Parameter | 05.048 Stator Base Temperature | ||
---|---|---|---|
Short description | Defines the base temperature used to calculate the temperature of the motor stator | ||
Mode | RFC‑A | ||
Minimum | -50 | Maximum | 300 |
Default | 0 | Units | °C |
Type | 16 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
See Stator Temperature Coefficient (05.047).
Parameter | 05.049 Enable Stator Compensation | ||
---|---|---|---|
Short description | Set to 1 to enable stator compensation | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 1 |
Default | 0 | Units | |
Type | 1 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
See Stator Temperature Coefficient (05.047).
Parameter | 05.050 Temperature Compensated Stator Resistance | ||
---|---|---|---|
Short description | Final stator resistance value used by the drive including temperature compensation | ||
Mode | RFC‑A | ||
Minimum | 0.000000 | Maximum | 1000.000000 |
Default | Units | ||
Type | 32 Bit Volatile | Update Rate | Background write |
Display Format | Standard | Decimal Places | 6 |
Coding | RO, ND, NC, PT |
Temperature Compensated Stator Resistance (05.050) shows the stator resistance value for the active motor that is being used by the drive including the effect of temperature compensation.
Parameter | 05.051 Rotor Temperature Source | ||
---|---|---|---|
Short description | Defines the source of the rotor temperature | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 6 |
Default | 1 | Units | |
Type | 8 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW, TE |
Value | Text |
0 | An In 3 |
1 | User |
2 | P1 Drive |
3 | P1 Slot1 |
4 | P1 Slot2 |
5 | P1 Slot3 |
6 | P1 Slot4 |
The rotor temperature can be used to compensate for changes in rotor resistance that affects the motor slip and hence the rated speed in Open-loop or RFC-A mode, or the magnet flux that affects motor torque in RFC-S mode. See Rotor Temperature Coefficient (05.054) for details. Rotor Temperature Source (05.051) is used to select the source for the rotor temperature measurement.
Rotor Temperature Source (05.051) | Source | Comments |
0 | Analog Input 3 Thermistor Temperature (07.050) | Analog input 3 must be set up for the correct temperature feedback device |
1 | User Rotor Temperature (05.052) | The user can provide a rotor temperature value if an alternative feedback device is to be used or the user provides an algorithm to model the rotor temperature |
2 | P1 Thermistor Temperature (03.122) | P1 position feedback interface must be set up for the correct temperature feedback device |
3-6 | Option Slot P1 Thermistor Temperature (xx.080) | A position feedback category option module must be fitted and the P1 position feedback must be set up for the correct temperature feedback device |
Parameter | 05.052 User Rotor Temperature | ||
---|---|---|---|
Short description | Defines the temperature of the motor as set by the user | ||
Mode | RFC‑A | ||
Minimum | -50 | Maximum | 300 |
Default | 0 | Units | °C |
Type | 16 Bit Volatile | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
See Rotor Temperature Source (05.051).
Parameter | 05.053 Rotor Temperature | ||
---|---|---|---|
Short description | Displays the temperature of the motor rotor | ||
Mode | RFC‑A | ||
Minimum | -50 | Maximum | 300 |
Default | Units | °C | |
Type | 16 Bit Volatile | Update Rate | Background write |
Display Format | Standard | Decimal Places | 0 |
Coding | RO, ND, NC, PT |
See Rotor Temperature Source (05.051).
Parameter | 05.054 Rotor Temperature Coefficient | ||
---|---|---|---|
Short description | Defines the coefficient used to calculate the temperature of the rotor | ||
Mode | RFC‑A | ||
Minimum | 0.00000 | Maximum | 0.10000 |
Default | 0.00390 | Units | 1/°C |
Type | 16 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 5 |
Coding | RW |
The slip of an induction motor is proportional to the rotor resistance, and so as the motor becomes hotter the slip increases. Therefore the rated speed of a motor, which is used by the drive control algorithm, changes with rotor temperature. To avoid less than optimal control the rated speed value used by the drive should be modified with changing rotor temperature. Temperature compensated rated speed (05.057) shows the rated speed from the active motor that is being used by the drive control system. If Enable Rotor Compensation (05.056) = 0 and motor 1 is selected (i.e. Motor 2 Active (21.015) = 0) then Temperature compensated rated speed (05.057) is equal to Rated Speed (05.008). If Enable Rotor Compensation (05.056) = 1 then Temperature compensated rated speed (05.057) is calculated as follows:
Uncompensated Rated Slip = Synchronous Speed - Rated Speed (05.008) = (Rated Frequency (05.006) x 60 / Number Of Motor Poles (05.011)) - Rated Speed (05.008)
Compensated Rated Slip = Uncompensated Rated Slip x [1 + ((Rotor Temperature (05.053) - Rotor Base Temperature (05.055)) x Rotor Temperature Coefficient (05.054))]
Temperature compensated rated speed (05.057) = (Rated Frequency (05.006) x 60 / Number Of Motor Poles (05.011)) - Compensated Rated Slip
If sensorless mode is not being used (i.e. Sensorless Mode Active (03.078) = 0) then an adaptive system is provided to adjust the Rated Speed (05.008) value (see Rated Speed Optimisation Select (05.016)). The adaptive control system cannot operate at low speeds or light loads, and so the rated speed may be incorrect if the motor runs under these conditions for a long period of time. If adaptive control is selected (i.e.Rated Speed Optimisation Select (05.016) > 0) and Enable Rotor Compensation (05.056) = 1 then Rotor Base Temperature (05.055) is updated with Rotor Temperature (05.053) while the adaptive controller is active, and so the rotor compensation system has no effect. When the adaptive controller changes to the inactive state because of the speed and load conditions, the Rotor Base Temperature (05.055) is no longer updated and the difference between this and the Rotor Temperature (05.053) is used to adjust the Rated Speed (05.008). When the adaptive controller becomes active again the rotor compensation system is disabled and Rated Speed (05.008) is again adjusted by the adaptive controller. Therefore the rotor compensation system provides the necessary adjustment of the rated speed when the adaptive controller cannot operate. To give a smooth change when the adaptive controller becomes active Temperature compensated rated speed (05.057) is copied to the rated speed parameter for the active motor once during the transition.
Parameter | 05.055 Rotor Base Temperature | ||
---|---|---|---|
Short description | Defines the base temperature used to calculate the temperature of the rotor | ||
Mode | RFC‑A | ||
Minimum | -50 | Maximum | 300 |
Default | 0 | Units | °C |
Type | 16 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
See Rotor Temperature Coefficient (05.054).
Parameter | 05.056 Enable Rotor Compensation | ||
---|---|---|---|
Short description | Set to 1 to enable rotor compensation | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 1 |
Default | 0 | Units | |
Type | 1 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
See Rotor Temperature Coefficient (05.054).
Parameter | 05.057 Temperature compensated rated speed | ||
---|---|---|---|
Short description | Final rated speed value used by the drive including temperature compensation | ||
Mode | RFC‑A | ||
Minimum | 0.00 | Maximum | 50000.00 |
Default | Units | rpm | |
Type | 32 Bit Volatile | Update Rate | Background |
Display Format | Standard | Decimal Places | 2 |
Coding | RO, ND, NC, PT |
Temperature compensated rated speed (05.057) shows the rated speed value for the active motor that is being used by the drive including the effect of temperature compensation.
Parameter | 05.059 Maximum Deadtime Compensation | ||
---|---|---|---|
Short description | |||
Mode | RFC‑A | ||
Minimum | 0.000 | Maximum | 10.000 |
Default | 0.000 | Units | µs |
Type | 16 Bit User Save | Update Rate | Background Read |
Display Format | Standard | Decimal Places | 3 |
Coding | RO, NC, PT |
Maximum Deadtime Compensation (05.059) is the deadtime compensation used to compensate for dead-time effects in the inverter. This level of compensation is used when the drive output current is above Current At Maximum Deadtime Compensation (05.060). Both of these values related to dead-time compensation are measured during auto-tuning and cannot be set by the user. It should be noted that if the auto-tuning test is not performed and Maximum Deadtime Compensation (05.059) = 0 then dead-time compensation is disabled. Although it is not recommended, it is possible to disable dead-time compensation by setting Disable Deadtime Compensation (05.061) = 1.
Parameter | 05.060 Current At Maximum Deadtime Compensation | ||
---|---|---|---|
Short description | Current at which maximum deadtime compensation is applied | ||
Mode | RFC‑A | ||
Minimum | 0.00 | Maximum | 100.00 |
Default | 0.00 | Units | % |
Type | 16 Bit User Save | Update Rate | Background Read |
Display Format | Standard | Decimal Places | 2 |
Coding | RO, NC, PT |
See Maximum Deadtime Compensation (05.059).
Parameter | 05.061 Disable Deadtime Compensation | ||
---|---|---|---|
Short description | Disable Deadtime Compensation | ||
Mode | RFC‑A | ||
Minimum | 0 | Maximum | 1 |
Default | 0 | Units | |
Type | 1 Bit User Save | Update Rate | Background Read |
Display Format | Standard | Decimal Places | 0 |
Coding | RW |
See Maximum Deadtime Compensation (05.059).
Parameter | 05.062 Saturation Breakpoint 2 | ||
---|---|---|---|
Short description | Defines Saturation Breakpoint 2 within the saturation characteristic | ||
Mode | RFC‑A | ||
Minimum | 0.0 | Maximum | 100.0 |
Default | 0.0 | Units | % |
Type | 16 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 1 |
Coding | RW |
See Saturation Breakpoint 1 (05.029).
Parameter | 05.063 Saturation Breakpoint 4 | ||
---|---|---|---|
Short description | Defines Saturation Breakpoint 4 within the saturation characteristic | ||
Mode | RFC‑A | ||
Minimum | 0.0 | Maximum | 100.0 |
Default | 0.0 | Units | % |
Type | 16 Bit User Save | Update Rate | Background read |
Display Format | Standard | Decimal Places | 1 |
Coding | RW |
See Saturation Breakpoint 1 (05.029).