Table 3-1. Direct Support Troubleshooting - continued
TEST OR INSPECTION
RAW WATER PUMP ASSEMBLY NO. 2
RAW WATER PUMP NO. 2 STOPS AND/OR FAILS TO START.
High voltages in this equipment can cause serious injury or death.. When applying
power during a test, take proper measures to ensure safety of personnel. Never work on
electrical equipment unless there is another person nearby who is familiar with the
operation and hazards of the equipment.
Step 1. Check if circuit breaker CB4 and/or heater assembly are tripped. Heater assembly is tripped if
resistance is felt when reset plunger is pushed in.
If circuit breaker or heater assembly is tripped, go to Malfunction 2, Raw Water Pump Assembly No 2.
Step 2. Check if other pumps operate.
If other pumps do not work, go to Malfunction 1, ROWPU Assembly.
Step 3. Check if relay K4 is ON.
If relay is not ON, go to step 7.
Step 4. Turn off power at pump switch and disconnect pump at junction box. Momentarily flip pump switch to
START and check for three phase power at RAW WATER PUMP NO. 2 connector, J4.
If voltage is measured, go to step 6.
Step 5. Turn power off at power source and perform a continuity check of power circuit as follows. Make
additional point-to-point checks as necessary to find defective components.
To check continuity through K4 it is necessary to physically push up on relay plunger
while making the check.