User`s manual

APPENDIX C – RESTART INTERLOCK CIRCUITS C-3
CDS7324 (FORMERLY LSF-0819)
Rev. A INSTALLATION & USER’S MANUAL
When a controlled stop of category 1, according to EN 60204-1:1997, is requested, the condition of stopped
motor must be assured. The external machine control must be able to stop the motor.
When the intervention time of the safety devices can be set up, appropriate precautions must be adopted to limit
the use only to qualified personnel. The intervention time of the restart interlock safety function must be higher
than the braking time of the deceleration ramp set by the drive with the maximum speed and the maximum load at
the axis.
When active, the restart interlock function removes the output torque and the motor is free to rotate. Adequate
protections must be provided when external forces act on the axis (e.g. gravity force on vertical axes), such as a
self-locking mechanical system or a weight equalization system.
The restart interlock function does not provide electrical isolation. It does not provide protection against "electric
shock". The complete machine or system must always be electrically isolated from the line supply through the
main disconnection contactor, secured on the open position, before any work is carried out on the machine or
system, e.g. maintenance, service or cleaning work (refer to EN 60204-1:1997, par. 5.3). Personnel must be
aware that Bus Bar's can have dangerous voltage even after switching off (capacitive voltage). Discharge time is
approx. 6 minutes.
When correctly used, the restart interlock function must be looped in the line contactor circuit in order to switch off
the power supply of the axis in case of fault.
The associated drive must be electrically isolated from the supply if the RIC relay function is not consistent (input
and output not compatible). Only after the fault has been removed, may the restart interlock and the associated
operating mode be used again.