Rockwell Automation 440F MatGuard, 440F-C4000 Mat Controllers - Manual (Page 40)

8.5.2 Symptom – Machine does not stop or can be started with presence on the mat.
DO NOT ALLOW USE OF THE MACHINE
1. With presence on the mat, is the MACHINE ENABLED LED illuminated on the mat control
unit ?
2. If the MACHINE ENABLED LED is not illuminated there is a probable fault on the machine or its
control system external to the mat system.– DO NOT ALLOW USE OF THE MACHINE
UNTIL THE FAULT HAS BEEN RECTIFIED AND TESTED.
3. If the MACHINE ENABLED LED is illuminated.– DO NOT ALLOW USE OF THE MACHINE AND
CONTACT THE SUPPLIER IMMEDIATELY.
8.5.3 Symptom – Machine stops unexpectedly with no presence on the sensor mat but can be
restarted after stepping on and off the mat (and resetting when in manual reset
mode).
1. Check that all indicator lights are operating correctly. If they are, the problem is likely to be caused by
a dip in supply power of a certain value and duration. This can cause one of the internal relays in the
control unit to drop out, thus simulating a fault condition. This is a very unlikely occurrence and no
remedial action is required. In the unusual event of the problem persisting, measures may be required to
ensure a smoother power supply to the mat system.
8.6 REPAIR
Prior to working on the mat system or machine control system, isolate power source to the machine and
mat system. Observe electrical safety precautions.
User repairs are limited to replacement by new mat system parts. In the event of problems, the units
should be returned to the supplier.
Any repairs to the connecting wires should be made using the recommended butt splice connectors.
TAMPERING WITH COMPONENT PARTS WILL INVALIDATE WARRANTY.
WARRANTY INVALID IF QUALITY SEAL IS BROKEN ON DIN RAIL CONTROL UNIT.
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