T M 1 0 - 4 6 1 0 - 2 3 2 - 1 2
Table 4-2. Unit Troubleshooting Guide (Continued)
TEST OR INSPECTION
(a) If it does not pull in, or, if it pulls in but does not stay in, notify direct support maintenance to
troubleshoot the booster pump circuits.
(b) If it pulls in and stays in, go to step 3.
Shut down the generator. Remove connector P21 (Reference Interconnection Diagram FO-2, Sheet
16) from the side of the control panel. Set the multimeter to Ohms x 1000 scale. Check each pin, P21A,
P21B, and P21C for a circuit to P21D. Each reading should be infinity.
If any reading is zero, there is a short circuit, go to step 5.
Set the multimeter to Ohms x 1 scale and check for continuity between all pin pairs; P21A and P21B,
P21B and P21C, and P21A and P21C. Readings should be zero or near zero for each step.
If the checks performed in both steps 3 and 4 are okay return the ROWPU to operation.
Check connectors J/P21 and J/P23 (Reference Interconnection Diagram FO-2, Sheet 16) for Ioose
pins and for signs of arcing.
Replace any cable that shows damage (para. 4-27 and 4-43).
Check continuity, point-to-point, from P21A to J23A, P21B to J23B, P21C to J23C, and P21D to J23D.
Check each lead for shorts between phases and shorts to the ground wire. The reading should be
infinity for each check.
(a) Replace any cable or connector that shows open during continuity checks (pare. 4-27).
(b) Replace an cable or connector that shows a short between phases or a short to ground
Remove the booster pump cover (para. 4-42). Tag and disconnect motor leads (T1, T2, T3). Set multi-
meter to Ohms x 1000 scale and connect test leads between each motor lead and the motor frame.
Readings should be infinity for each step.
Replace booster pump/motor assembly if the meter reading is zero (para. 4-43).
Set multimeter to Ohms x 1 scale and check for continuity between all pairs of motor leads, T1 and
T2, T1 and T3, T2 and T3. Readings should be zero or near zero for each step.
Replace booster pump/motor assembly if reading is infinity (para. 4-43).
Check motor cable for continuity on each read and for shorts between phases and ground. Replace
the cable if open or shorted (para. 4-43).
2. Booster pump will not start in SYSTEM NORMAL when forward flushing the media filter (Reference Schematic
Diagram FO-1, Sheet 6, schematic line 625).
Open the cartridge filter block valve. Start the raw water pump and then the booster pump.
(a) If the pump won't start, refer to booster pump won't start in SYSTEM NORMAL troubleshoot-
ing (malfunction 1).
(b) Notify direct support maintenance.
3. Booster pump circuit breaker opens whenever booster pump is stated. ROWPU shuts down when booster
pump is started (Reference Schematic Diagram FO-1, Sheet 5, schematic lines 540-542).
Check for short circuits.
(a) Shut down the ROWPU. Shutdown the generator.
(b) Refer to booster pump wont start (SYSTEM NORMAL), steps 5-9 (malfunction 1).
(c) Notify direct support maintenance.
4. Booster pump motor hums but wont turn (Reference Schematic Diagram FO-2, Sheet 15, schematic lines
Step 1. Check generator voltage on all 3-phases. If must be 435-445 VAC on each phase.
(a) Adjust to correct voltage.
(b) If voltage is not correct on all 3-phases, refer to generator troubleshooting.
Step 2. Check system air pressure and use an air manifold drain valve to lower it below 1400 psig (9653 kPa).
Turn the air compressor switch on and note if the air compressor runs.
If the air compressor does not operate, notify direct support maintenance.
4-62 Change 1