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    Filling sequence

    The Tracker 244 and 225 have 2 relays with volt free contact or 4 TTL outputs respectively. These outputs can be used for alarms or for a batch control filling sequence.

     

    The filling modes can be "Fill", where the container to be filled is on the load cells, or "Loss of weight" where the product's reservoir/tank is on the load cells.

    Typical Fill Control Sequence

    This sequence will detect a new empty container is in position and will fill to 97Kg (Setpoint 1 / Output 1) and then trickle feed to 100Kg (Setpoint 2 / Output 2) to avoid over filling.

    1. Start Trigger - detects the weight of a empty container (Optionally triggered by a logic input or front panel push button)
    2. Wait Predetermined time (seconds)
    3. Tare Load cell value
    4. Zero and start cut-off Timer (Pre-set maximum fill time)*
    5. Switch Outputs 1 and 2 on (Fill and Trickle feed valves open)
    6. Wait until 97Kg is measured or cut-off timer pre set time exceeded*
    7. Turn Off Output 1 and 2
    8. Wait Pre set in-flight time
    9. Store actual weight (e.g. 97.35Kg)**
    10. Turn on output 2 (trickle feed valve open only)
    11. Wait until 100Kg delivered or cut-off timer exceeded*
    12. Turn off Output 2
    13. Wait in-flight time
    14. Store weight value (e.g. 100.12Kg)**

     

    * The sequence will be terminated immediately if the cut-off time is exceeded.

    ** The actual fill weights are stored to calculate the in-flight setpoint ajustments for the next sequence to improve filling accuracy.