3 TROUBLESHOOTING
3.1 SELF-DIAGNOSTIC SOFTWARE
The device includes several self-monitoring functions to check the operation of its hardware and software while in
ser
vice. If there is a problem with the hardware or software, it should be able to detect and report the problem, and
attempt to resolve the problem by performing a reboot. In this case, the device would be out of service for a short
time, during which the ‘Healthy’ LED on the front of the device is switched OFF and the watchdog contact at the
rear is ON. If the restart fails to resolve the problem, the unit takes itself permanently out of service; the ‘Healthy’
LED stays OFF and watchdog contact stays ON.
If a problem is detected by the self-monitoring functions, the device attempts to store a maintenance record to
allow the nature of the problem to be communicated to the user.
The self-monitoring is implemented in two stages: firstly a thorough diagnostic check which is performed on boot-
up, and secondly a continuous self-checking operation, which checks the operation of the critical functions whilst
it is in service.
3.2 POWER-UP ERRORS
If the IED does not appear to power up, use the following checks to determine whether the fault is in the external
wiring, auxiliar
y fuse, IED power supply module or IED front panel.
Test Check Action
1
Measure the voltage on terminals 13 and 14. Verify
the v
oltage level and polarity against the rating label
If the auxiliary voltage is correct, go to test 2. Otherwise check the wiring
and fuses in the auxiliary supply.
2
Check the LEDs and LCD backlight switch on at
power-up. Also check the N/O (normally open)
watchdog contact on terminals 4 and 6 to see if they
close.
If the LEDs and LCD backlight switch on, or the Watchdog contacts close
and no error code is displayed, the error is probably on the main processor
board.
If the LEDs and LCD backlight do not switch on and the N/O Watchdog
contact does not close, the fault is probably in the IED power supply
module.
3.3 ERROR MESSAGE OR CODE ON POWER-UP
The IED performs a self-test during power-up. If it detects an error, a message appears on the LCD and the power-
up sequence stops. If the err
or occurs when the IED application software is running, a maintenance record is
created and the device reboots.
Test Check Action
1
Is an error message or code permanently displayed
during pow
er up?
If the IED locks up and displays an error code permanently, go to test 2.
If the IED prompts for user input, go to test 3.
If the IED reboots automatically, go to test 4.
2 Record displayed error and re-apply IED supply.
Record whether the same error code is displayed when the IED is
r
ebooted, then contact the local service centre stating the error code
and product details.
3
The IED displays a message for corrupt settings and
pr
ompts for the default values to be restored for the
affected settings.
The power-up tests have detected corrupted IED settings. Restore the
default settings to allow the power-up to complete, and then reapply
the application-specific settings.
Chapter 20 - Maintenance and Troubleshooting P24xM
424 P24xM-TM-EN-2.1
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