Rockwell Automation 440F MatGuard, 440F-C4000 Mat Controllers - Manual (Page 39)

8.4 DISMANTLING AND DISPOSAL
Dismantling the mat system is the reverse of the installation procedure and no extra hazards are
presented.
ENSURE THAT THE MACHINE AND MAT SYSTEM POWER IS ISOLATED AND LOCKED OFF AT
SOURCE BEFORE STARTING WORK.
If the system is to be reconfigured or relocated, observe the handling precautions given in section 1.
The mat system does not contain any hazardous materials which require special precautions for
disposal.
8.5 FAULT FINDING
Disconnect prime mover prior to working on mat control system with power applied.
Observe electrical safety precautions.
8.5.1 Symptom – With no presence on the mat and after the correct reset procedure has been
followed, the machine cannot be started.
1. If the MACHINE ENABLED LED on the mat control unit is ON there is a probable fault on the
machine or its control system external to mat system. Check the external fuses in the control
unit safety output wiring and replace if necessary. ENSURE THAT THE CORRECT VALUE OF
FUSE IS USED (2A max). Record the replacement in the inspection log. If either fuse blows
immediately or requires early replacement there is a probable fault in the machine
control circuit between the safety output of the mat control unit and the machine’s final control
element(s) (contactors).
2. If the MACHINE ENABLED LED on the mat control unit is OFF, take the following actions:
Check that the the POWER LED is illuminated.
If it is not, check the power supply to the mat control unit.
Check that the power supply is connected to the appropriate terminals.
Check the primary and secondary fuses in the control unit and replace if necessary. ENSURE
THAT THE CORRECT VALUE OF FUSE IS USED (500mA anti-surge) for both
primary and secondary fuses. Record the replacement in the inspection log. If either fuse
blows immediately or requires early replacement please contact the supplier.
3. If the the MACHINE ENABLED LED on the mat control unit is OFF and the POWER LED is ON.
On dual channel systems with contactor monitoring, if the external safety output fuses have
not blown, it is still probable that there is a fault external to the control unit. A single fault in
either wiring channel will cause the mat control unit to lock off the safety outputs until the fault
is rectified and the control unit is reset. Check that all connecting wiring in the
system is configured correctly and has not been damaged and that both contactors are
functioning correctly.
Rectify any faults and if in manual reset mode press and release the control unit reset
button.
4. If the problem is not resolved please contact the supplier.
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