Alstom MiCOM P545 - 1. INTRODUCTION; 2. INITIAL PROBLEM IDENTIFICATION; 3. POWER UP ERRORS

Troubleshooting P54x/EN TS/La4
MiCOM P543, P544, P545 & P546
(TS) 12-3
1. INTRODUCTION
Before carrying out any work on the equipment, the user should be familiar with the
contents of the Safety Guide (SFTY/4L M/H11) or later issue, or the Safety and
Technical Data sections of this Technical Manual and also the ratings on the
equipment’s rating label.
The purpose of this section of the service manual is to allow an error condition on the relay
to be identified so that appropriate corrective action can be taken.
Should the relay have developed a fault, it should be possible in most cases to identify which
relay module requires attention. The Maintenance chapter (P54x/EN MT) advises on the
recommended method of repair where faulty modules need replacing. It is not possible to
perform an on-site repair to a faulted module.
In cases where a faulty relay/module is being returned to the manufacturer or one of their
approved service centers, completed copy of the Repair/Modification Return Authorization
Form located at the end of this section should be included.
2. INITIAL PROBLEM IDENTIFICATION
Consult the table below to find the description that best matches the problem experienced,
then consult the section referenced to perform a more detailed analysis of the problem.
Symptom Refer to
Relay fails to power up Section 3
Relay powers up - but indicates error and halts during
power-up sequence
Section 4
Relay Powers up but Out of Service LED is illuminated Section 5
Error during normal operation Section 6
Mal-operation of the relay during testing Section 7
Table 1: Problem identification
3. POWER UP ERRORS
If the relay does not appear to power up then the following procedure can be used to
determine whether the fault is in the external wiring, auxiliary fuse, power supply module of
the relay or the relay front panel.
Test Check Action
1
Measure auxiliary voltage on
terminals 1 and 2; verify voltage
level and polarity against rating
the label on front.
Terminal 1 is –dc, 2 is +dc
If auxiliary voltage is present and correct,
then proceed to test 2. Otherwise the
wiring/fuses in auxiliary supply should be
checked.
2
Do LEDs/and LCD backlight
illuminate on power-up, also check
the N/O watchdog contact for
closing.
If they illuminate or the contact closes and no
error code is displayed then error is probably
in the main processor board (front panel). If
they do not illuminate and the contact does
not close then proceed to test 3.
3
Check Field voltage output
(nominally 48 V DC)
If field voltage is not present then the fault is
probably in the relay power supply module.
TS
Table 2: Failure of relay to power up