Table 2-2. Unit Troubleshooting - continued
TEST OR INSPECTION
RAW WATER PUMP NO. 2 ASSEMBLY - continued
PUMP ASSEMBLY SHUTS DOWN 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 and see if CB4 and or heater assembly of motor starter K4 are tripped.
TRIPPED window in heater assembly of motor starter K4 will indicate white, if
heater assembly is tripped.
If CB4 and/or heater assembly are not tripped, go to step 4.
Step 2 Turn CB3 and CB4 to OFF and connect raw water pump no. 2 to RAW WATER PUMP
NO. 1 jack, J3. Turn CB3 to ON.
If CB3 and/or heater assembly of motor starter K3 do not trip, trouble is in ROWPU,
Direct Support Maintenance.
Step 3. Turn CB3 to OFF and disconnect raw water pump no. 2 cable assembly at junction
box and at pump motor (paragraph 2-19). Check cable assembly for shorts.
If cable assembly is defective (shorted), replace it (Refer to Paragraph 2-19).
If cable assembly is not defective, replace centrifugal pump (Paragraph 2-20).
Step 4. Turn CB4 to OFF and disconnect raw water pump no. 2 at junction box. Turn CB4 back
on. Check for 208 VAC three phase power at RAW WATER PUMP NO 2jack, J4.
If 208 VAC is not measured in all three tests (A-B, A-C and B-C, notify Direct
Step 5. Disconnect cable assembly at motor of raw water no. 2 (Paragraph 2-19) and check
cable assembly for continuity.
If continuity is absent (open) in any wire, replace cable assembly (Paragraph 2-19).
If cable is not open, replace centrifugal pump assembly (Paragraph 2-20).