SECTION EIGHT – Safety function RESTART INTERLOCK (Optional)
DS2000 USER’S MANUAL (rev.C)
8.11
Hardware Channel
• When the door is opened, the door control module (delayed output 33-34 of A1) opens,
after a delay t1, the inputs of the hardware channels.
• If the NC contacts of the safety relays 1 and 2 do not close, the KM1 contactor is de-
energized (delayed output 37-38 of A1) and the power supply to the drive is switched off
• If the drop-out time of the relays 1 and 2 (approx.100 ms) is less than the drop-out time of
the KM1 contactor, the KM1 contactor will be de-energized at the opening of the doors. In
this case it is possible to add a capacitor in parallel to the coil of KM1 or delay the
intervention of output 37-38 of A1 in comparison with output 33-34 of A1, in order to avoid
the de-energization when the door is opened.
• The application example checks the status of relays 1 and 2 only at the de-energization
(NC contacts closed) and not at the energization (NC contacts opened). This way it is not
possible to find a short circuit. Then, the cables must be mechanically protected.
Requirements
• The delayed output of the control module which drives the hardware channels (safety
relays) and the PLC output which drives the SW channel must be set taking care that the
intervention of the safety function should occur only with motor at standstill.
• When it is possible to stay with the complete human body inside the hazardous zone over
the protective guards, the restart must be available only after a separate reset following
the closure of the protective guards confirming that no personnel is inside the hazardous
zone
• The door control module must be compliant with at least category 3 of EN 954-1.
• See par.8.6 for the technical data
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