Repairing The Device; Removing The Front Panel; Figure 302: Possible Terminal Block Types - GE MiCOM P40 Technical Manual

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Chapter 25 - Maintenance and Troubleshooting

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.

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.

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.

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.

P446SV-TM-EN-1