User`s manual

APPENDIX C – RESTART INTERLOCK CIRCUITS C-13
CDS7324 (FORMERLY LSF-0819)
Rev. A INSTALLATION & USER’S MANUAL
C.8 CHECKING THE RESTART INTERLOCK
The following checks must always be made at commissioning and when possible must be repeated at defined
intervals during the operating lifetime. A check should also be made after extended production shutdowns. Each
individual drive must be checked.
Only qualified personnel, taking into account the necessary safety procedures, must make the following checks:
• Check that the motor is at standstill.
• Inhibit the IGBT drivers by removing the voltage at position 2 (Channel 1) of RESTART INTERLOCK
connector. The acknowledge contacts 5-6 (Channel 1 verification) of RESTART INTERLOCK connector must
be closed. The drive must not provide output current.
• If “Channel 2” is also used: inhibit the IGBT drivers by removing the voltage at position 4 (Channel 2) of
RESTART INTERLOCK connector. The acknowledge contacts 7-8 (Channel 2 verification) of RESTART
INTERLOCK connector must be closed. The drive must not provide output current.
• Put the drive in the starting condition, with Drive Enable OFF. Send a reference signal to the motor velocity
and verify that the motor does not rotate.
• Disable the protective devices, e.g. by opening the protective doors while the motor is running. If the stop is
category 1, check that the motor is braked in a controlled stop and that the Restart Interlock function is
activated after the stop. This must not result in a hazardous condition.
• All possible fault situations, which could occur, must be individually simulated in the signal paths between the
verification contacts and the external control as well as the signal consistency functions of this control.
Example: by disconnecting the Restart Interlock monitoring circuit at positions 5-6 of RESTART INTERLOCK
connector (condition 1) or by simulating a short circuit within the cable (condition 2) when this cannot be
excluded.
For all of the simulated fault situations, the line contactor must disconnect all of the machine or plant drives from
the line supply.