Table 3-1. Direct Support Troubleshooting- continued
TEST OR INSPECTION
DISTRIBUTION PUMP ASSEMBLY
DISTRIBUTION PUMP 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 CB5 and/or heater assembly are tripped. Heater assembly is tripped if resistance
is felt when it is reset.
If circuit breaker, heater assembly, or both are tripped, go to Malfunction 2, Distribution Pump Assembly.
Step 2. Check if other pumps operate.
If other pumps are inoperable, go to Malfunction 1 ROWPU Assembly.
Step 3. Visually check if relay K5 is ON or OFF.
If relay is OFF, go to step 7.
Step 4. Check if 208 VAC is available between T1-T2, T2-T3 and T1-T3 on heater assembly.
If voltage is measured in all three tests, go to step 6.
Step 5. Remove power at power source and perform a continuity check of power circuit as follows. Make
additional point-to-point continuity checks as necessary to find defective component:
To check continuity through K6 it is necessary to physically push in on relay plunger while making the
L1, CB4 - J5(A)
L2, CB4 - J5(B)
L3, CB4 - J5(C)