Table 2-2. Unit Troubleshooting - continued
TEST OR INSPECTION
RAW WATER PUMP NO. 1 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 CB3 and or heater assembly of motor starter K3 are tripped.
TRIPPED window in heater assembly of motor starter K3 will indicate white, if
heater assembly is tripped.
If CB3 and/or heater assembly are not tripped, go to step 4.
Step 2. Turn offCB3 and CB4 and connect raw water pump no.1 to RAW WATER PUMP
NO. 2 jack, J4. Flip CB4 to ON.
If CB4 and/or heater assembly of motor starter, K4 trip, trouble is in. ROWPU, notify Direct Support
Step 3. Turn CB4 to OFF and disconnect raw water pump no. 1 cable at junction box and at pump motor
(Paragraph 2-19). Check cable assembly for shorts.
If defective (shorted), replace pump cable assembly (Paragraph 2--19).
If cable assembly is not defective, replace centrifugal pump (Paragraph 2-20).
Step 4. Turn CB3 to OFF and disconnect raw water pump no.1 from junction box. Turn CB3 back on and check
for 208 VAC three phase power at RAW WATER PUMP NO 1 jack, J3.
If 208 VAC is not measured in all three tests (A-B, A-C and B-C, notify Direct Support Maintenance.
Step 5. Disconnect cable assembly at motor of raw water no. 1 (Paragraph 2-19) and check cable assembly for
If continuity is absent (open) in any wire, replace cable assembly. Refer
to Paragraph 2-19