Rockwell Automation Publication 6000-IN006F-EN-P - March 2018 35
Drive Electrical Installation Chapter 2
Connect Electrical Safety
Interlock Circuit to Input
Circuit Breaker
Introduction
The electrical safety interlock circuit is part of the overall control signal wiring
activity. However, it is mentioned separately in this document due to its critical
importance related to the safe operation of the drive and personnel safety.
The circuits connected between the drive and the input circuit breaker:
• allow the drive to trip the input circuit breaker if a drive cabinet door is
opened. This applies to the cabinet doors where medium voltage is
present. The LV Control cabinet door can be opened while the drive is
energized.
• allow the drive to prevent the input circuit breaker from closing when
required.
• indicate to the drive when the input circuit breaker is closed.
MV Door Safety Interlock
If the MV cabinet door is opened, the Allen-Bradley Guardmaster Limit Switch
(440P-CRPS11D4B) on the cabinet door will actuate. The drive will send a trip
signal to the input circuit breaker to disconnect the medium voltage power
supply to the drive.
Figure 24 - Interlock for Cabinet Doors
ATTENTION: The door position interlock is a safety feature. It must not be used
solely as a part of the plant operation process to ensure the drive has been
disconnected from input medium voltage. Keep the medium voltage doors
locked as standard practice. Always go to the input circuit breaker feeding the
drive to verify if it is open. Lock out and tagout the input circuit breaker before
performing any work on the drive or bypass units.
Door Position Limit Switch
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