Power Up Errors - GE MiCOM P40 Agile Technical Manual

Troubleshooting
MiCOM P40 Agile P442, P444
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
Measure auxiliary voltage on terminals 1
and 2; verify voltage level and polarity
1
against rating the label on front.
Terminal 1 is –dc, 2 is +dc
Do LEDs/and LCD backlight illuminate on
power-up, also check the N/O watchdog
contact for closing.
2
Check Field voltage output (nominally
3 48 V DC)
Table 2: Failure of relay to power up
Action
If auxiliary voltage is present and correct,
then proceed to test 2. Otherwise the
wiring/fuses in auxiliary supply should be
checked.
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.
If field voltage is not present then the fault
is probably in the relay power supply
module.
P44x/EN TS/Hb6
(TS) 11-7