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Functional Safety

Safer machines with integrated safety

 

What is functional safety? 

Functional Safety entails the detection of a potentially dangerous condition resulting in the activation of a protective or corrective device or mechanism to prevent hazardous events arising or providing mitigation to reduce the consequence of the hazardous event.

In the design of a machine, a risk assessment must be performed and then updated regularly. As far as possible, the machine should be designed to be inherently safe, so that hazards are eliminated from the basic design. However, in most cases some risks remain at an unacceptable level and must be actively reduced using suitable control measures.

Why integrated safety? 

The integration of motion safety functions in the drive supports a decentralized approach to the machine's functional safety that brings many benefits

  •  Reduced complexity and therefore design time
  •  Reduced wiring and consequential costs
  •  Ease of commissioning
  •  Speed of actuation due to close-coupling of safety function and drive

Functional-Safety-Conventional-Integrated-Approach-Diagrams

 
 
Reduce downtime with motion safety

When human intervention is required to carry out inspection and repair or simply during production, it is essential to protect personnel from interaction with dangerous moving parts.

A comprehensive selection of Motion Safety Functions offers the flexibility to provide maximum protection whilst minimizing the impact on machine availability.

Brake and stop
Safe-Torque-Off-Diagram Safe Torque Off (STO) prevents the drive from generating toque in the motor.
The drive’s DC link stays energized, allowing for a fast restart
Safe-Brake-Control-Diagram Safe Brake Control (SBC) can be used in conjunction with STO for the safe control of an electromechanical brake
 Safe-Operating-Stop-Diagram Safe Operating Stop (SOS) keeps the energized motor in a safely monitored standstill condition
Safe-Stop-1-Diagram Safe Stop 1 (SS1) allows a controlled stop of the motor before removing power via the Safe Torque Off
Safe-Stop-2-Diagram Safe Stop 2 (SS2) allows a controlled stop of the motor followed by a Safe Operating Stop condition
Speed and acceleration monitoring
Safely-Limited-Speed Safely Limited Speed (SLS) safely monitors the motor speed to keep it within a specified limit
Safely-Speed-Monitor-Diagram Safe Speed Monitor (SSM) provides a safe signal to indicate the motor is operating below a
specified speed limit
Safety-Limited-Acceleration-Diagram Safely Limited Acceleration (SLA) safely monitors the motor acceleration to keep it within
a specified limit
Safe-Direction-Diagram Safe Direction (SDI) safely monitors the motion direction
Position monitoring
Safely-Limited-Position Safely Limited Position (SLP) monitors the absolute position of the motor to prevent it from
moving outside of the specified range
Network safety
Safe-Value-Transfer Safe Value Transfer safe position and speed value transfer over safety fieldbus for further
processing by safety controller
Additional functions
STHC3-Safe-Two-Handed-Control STHC3 – Safe Two-Handed Control safely monitors the contemporary application
of two push-buttons
Safe-Emergency-Stop-Icon Safe Emergency Stop (SES) safe monitoring of an emergency stop button
 
 

 


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