Unidrive
Secure Disable Function

Secure Disable Applications

Case 1: Simple Start / Stop
Case 2: Interlock to EN 954-1 Cat 2
Case 3: Fail safe interlock to EN 954-1 Cat 3
Case 4: Secure Disable used in EN 954-1 Cat 4
Case 5: Provision of braking through drive
Case 6: Elevators to EN 81-1: 1998

As well as in conventional non-safety-related applications, Secure Disable can also be used in any position where contactors with connected movement are used to achieve safe disable.


Case 1 – Simple stop/start control to EN 954-1 Cat1

The benefits of using Secure Disable on the Unidrive are:

  • Power contactor replaced by a signal relay (cost and space saving)
  • Drive can now have power applied continuously, so that its auxiliary functions remain active
  • 24V DC logic supply can be taken from the drive, eliminating an external supply (cost and space saving)