SECTION EIGHT – Safety function RESTART INTERLOCK (Optional)
DS2000 USER’S MANUAL (rev.C)
8.12
8.8 SEQUENCE AND PROCEDURE USING THE RESTART INTERLOCK
The motor must be stopped before the hardware and software channels are inhibited and the
Restart Interlock is activated.
WARNING:
If a fault occurs when actuating the Restart Interlock, then this fault must
be removed before the mechanically isolating protective guards to the working zone of
the machine or plant are opened. After the fault has been removed, this procedure
must be repeated for the Restart Interlock. Under fault conditions, alI of the drives,
machine and plant must be shut down.
If one of the following faults should occur with the contacts of the “hardware channel
verification” opened (0V) and the protective guards withdrawn, then the EMERGENCY STOP
must start immediately:
• The acknowledgement contact “Channel 1 verification” remains open after the
intervention of the Restart Interlock.
• If also “Channel 2” is used: the acknowledgement contact “Channel 2 verification” remains
open after the intervention of the Restart Interlock.
• There is a fault in the external control circuit itself.
• There is a fault in the signal lines of the verification contacts.
AlI the drives associated with the machine/plant must be disconnected and isolated from the
line supply through the line contactor.
WARNING:
the line contactor must have a NC contact linked to safety NO contacts.
If the Restart Interlock control has been correctly integrated into the external safety-related
control and has been checked to ensure correct functioning, then the drives in the separate
working zone of the machine are protected against undesirable starting, and personnel can
enter or operate in the hazardous zone which has been defined.
CAUTION:
where the equipment requires manual intervention the relevant regulations
must be taken into account
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