Caution:
If the top and bottom access covers have been removed, some more screws with
smaller diameter heads are made accessible. Do NOT remove these screws, as they
secure the front panel to the device.
Note:
There are four possible types of terminal block: RTD/CLIO input, heavy duty, medium duty, and MiDOS. The terminal blocks are
fastened to the rear panel with slotted or cross-head screws depending on the type of terminal block. Not all terminal block
types are present on all products.
Figure 322: Possible terminal block types
2.3
REPAIRING THE DEVICE
If your product should develop a fault while in service, depending on the nature of the fault, the watchdog
contacts will change state and an alarm condition will be flagged. In the case of a fault, either the complete unit or
just the faulty PCB, identified by the in-built diagnostic software, should be replaced.
Replacement of printed circuit boards and other internal components must be undertaken by approved Service
Centres. Failure to obtain the authorization of after-sales engineers prior to commencing work may invalidate the
product warranty.
We recommend that you entrust any repairs to Automation Support teams, which are available world-wide.
2.4
REMOVING THE FRONT PANEL
Warning:
Before removing the front panel to replace a PCB, you must first remove the auxiliary
power supply and wait 5 seconds for the internal capacitors to discharge. You should
also isolate voltage and current transformer connections and trip circuit.
Chapter 26 - Maintenance and Troubleshooting P543i/P545i
702 P54x1i-TM-EN-1
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