Locating The Defective Board - GE ALPS Instruction Manual

9.2 TROUBLESHOOTING
Use Section 9.2.7: SERVICE SYSTEM STATUS FAILURES on page 9–5 or the Information Status command to isolate the
cause of the failure. Then refer to Figure 3–3: CIRCUIT BOARD LOCATIONS on page 3–3 to determine which board con-
tains the defective logic module. When the suspected board is found, power down the ALPS and replace the board.
The proper sequence for replacing a board is as follows:
1. Remove the four thumbscrews holding the plastic cover in place and lay aside with the plastic cover.
2. Turn the power switch off on the front panel.
3. Remove DC power from the ALPS.
Completely power down the relay by disconnecting the control DC power and by removing all voltage
inputs to the rear terminals prior to opening the unit. Dangerous or lethal voltages may be present inside
WARNING
the unit even if the power switch is OFF.
4. Remove the four 3/16" hex nuts at the four corners of the front panel and carefully remove the front panel.
5. Disconnect the power and the ribbon cables from the front panel and lay the panel aside.
6. Remove the two ribbon cables and power cables from the front of the PC boards and lay aside.
7. Remove the PC board that connects the other PC board and lay aside in an anti-static bag.
8. Remove the defective PC board and place into an anti-static bag for storage or shipment.
9. Remove the replacement board from its anti-static container and insert into the ALPS case.
10. Reinstall the connecting PC board.
11. Reinstall the ON/OFF switch cable and the two ribbon cables.
12. Reconnect the LCD display ribbon cable and the RESET/METERING cable to the front panel with the four 3/16" hex
nuts.
13. Restore DC power to the ALPS.
14. Turn on the front panel power switch.
15. Reinstall the plastic cover with the four thumbscrews.
If the FAIL message is gone, then the unit has been successfully repaired. If the message has changed, it is possible that
another board requires replacement.
A non-critical failure indicates an interruption potential in the ALPS protection, but not a total loss. When a non-critical fail-
ure occurs, the ALPS non-critical alarm contact closes, but the LED remains green. Turn off the DC input power, then reap-
ply it. The WARN xxx message reappears if the failure still exists.
The non-critical failure message has the format WARN xxx. The xxx field is the numeric code that indicates the nature of
the failure. The WARN message remains on the display until a key is pressed or until the ALPS restarts successfully with
no self-test failures. See Section 9.2.7 SERVICE SYSTEM STATUS FAILURES for the list of Warning codes and their
meanings.
As an alternative, the Information Status command can be used to display the warning type directly on the LCD
Display.
NOTE
9
Use Section 9.2.7: SERVICE SYSTEM STATUS FAILURES or the Information Status command to isolate the cause of the
failure. Power down the ALPS and replace the suspected board, if appropriate. Reapply power; if the WARN message is
gone, then the unit has been successfully repaired. If the message has changed, it is possible that another board requires
replacement.
9-4 ALPS Advanced Line Protection System

9.2.4 LOCATING THE DEFECTIVE BOARD

9.2.5 SERVICING A NON-CRITICAL FAILURE
9.2.6 LOCATING THE DEFECTIVE BOARD
GE Power Management
9 SERVICING