Table 3-1. Direct Support Troubleshooting-continued
TEST OR INSPECTION
REVERSE OSMOSIS (R.O.) PUMP ASSEMBLY - continued
UNABLE TO JOG REVERSE OSMOSIS (R.O.) PUMP (Models WPES-20 and H-9518-2).
Step 1. Check if circuit breaker, CB 1 and/or heater assembly are tripped. TRIPPED window will show white if
If either one or both are tripped, go to Malfunction 3, R.O. Pump Assembly.
Check if other pumps operate.
If other pumps do not operate, go to Malfunction 1, ROWPU Assembly.
Step 3. Check if relay, K1 comes ON when jog switch is held to ON position.
If relay does not come on when jog switch is held to ON, go to step 7.
Step 4. Turn off power at pump switch and disconnect pump cable at J6 (back ofjunction box). Check if 208
VAC, three phase power is available at J6 when jog switch is held to ON position.
If power is available in all three tests (A-B, A-C and B-C), go to step 6.
step 5. Turn off power source and check power circuit for continuity as follows. Make additional point-to-point
continuity checks as necessary to find defective component:
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.
To check continuity through K1, it is necessary to physically push up relay plunger while
making the check.
If CB 1 is open (CB 1 ON), replace CB 1. Refer to Paragraph 3-53.
If K1 is open, replace motor starter. Refer to Paragraph 3-61.
3-62 Change 1