T M 1 0 - 4 6 1 0 - 2 3 2 - 12
Table 4-2. Unit Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Continuity and short circuit test arrangements for pump motor are shown in Figures
4-3 and 4-4.
NOTE
Ensure that all circuit breakers are set before troubleshooting.
1. High pressure pump will not start (Reference Schematic Diagram FO-1, Sheet 6, schematic lines 632-637-
control circuits, Reference Schematic Diagram FO-1, Sheet 5, schematic lines 502-510-power circuits).
Step 1. Shutdown the ROWPU. Open the main control panel lower door. Check that the overload reset button
on MS8-1M (Reference Interconnection Diagram FO-2, Sheet 10) is in by pushing it.
(a) If the reset button is in, notify direct support maintenance to troubleshoot the high pressure
pump motor circuits.
(b) If the button is out and won’t reset, notify direct support maintenance to replace the overload
heaters on MS8-1M and troubleshoot the high pressure pump motor circuits.
(c) If the reset button is out but resets when pushed, notify direct support maintenance to adjust
the door reset assembly for MS8-1M and then restart the pump.
(d) If the pump won’t start or starts and shuts down, notify direct support maintenance to
troubleshoot the high pressure pump motor circuits.
2. High pressure pump motor hums but won’t turn. High pressure pump turns over easily.
Notify direct support maintenance to check for shorted motor.
3. High pressure pump starts, but generator loads down and won’t let the pump come up to full speed. Lights may
dim. Generator circuit breaker may open. Generator exhaust is thick and black.
W A R N I NG
Do not start the high pressure pump if water is not flowing freely out of the waste
hose.
Check that water is flowing from the waste hose when the raw water and booster pump are running.
(a) If water is not flowing, check through the system and find where the water flow stops. Repair
as necessary.
(b) If operating in freezing conditions check that the high pressure hoses on the high pressure
pump skid are not frozen.
(c) Notify direct support maintenance.
RAW WATER PUMP.
W A R N I NG
Electrical high voltage can cause serious injury or death. Some tests performed in
troubleshooting require power to be connected. Always take proper measures to en-
sure personal safety.
NOTE
Continuity and short circuit test arrangements for pump motor are shown in Figures
4-1 and 4-2.
4-64 Change 1
