TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8.
9.
10.
11.
12.
Booster pump will not start in the system “STANDBY” mode (Ref. Schematic diagram FO-2, sheet 6, schematic Iine
629).
Step 1. Check if the pump runs in system “NORMAL”.
Refer to that problem troubleshooting if it does not operate correctly (malfunction 1).
Step 2. Check if the pump runs in system “CLEAN”.
Refer to that problem troubleshooting if it does not operate correctly (malfunction 6).
Step 3. Shut down the ROWPU. Open the control panel. Restore power to the panel, push “INITIATE’ and select
system “STANDBY”. Check the indicating plunger on relay K5 (REF: Interconnection diagram FO-2, Sheet
7). it should be in.
If it is out, refer to system on/system standby circuit troubleshooting (control circuits malfunction 1).
Step 4. Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Check continuity, point-to-
point, from relay K9(A1Y) (REF: Interconnection diagram FO-2, Sheet 8) to relay K19(A2X) (REF:
Interconnection diagram FO-2, sheet 6). Check continuity, point-to-point, from relay K21(A4Y) to relay
K3(B4X) (REF: Interconnection diagram FO-2, Sheet 6). Depress the indicating plunger on K5 (REF:
Interconnection diagram FO-2, Sheet 7) while testing both of its contacts.
(a) Repair any loose or damaged wires (para. 2-20).
(b) Replace relay K5 if either of its contacts do not close when testing (para. 2-23).
Booster pump runs but pilot light does not work. Light test okay. (Ref. Schematic diagram FO-1, sheet 6, schematic line
629).
Shut down ROWPU and generator. Refer to electrical drawings in appendix D. Remove wire #243 from the MS7 (REF:
Interconnection diagram FO-2, Sheet 10) coil. Check continuity, point-to-point, from wire #243 on MS7 to pilot light
PL10 (REF: Interconnection diagram FO-2, Sheet 11), wire #244.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace LTK1 (REF: Interconnection diagram FO-2, Sheet 7) if its contact is open (para. 2-23).
Booster pump motor starter (MS7) does not putt In. (Ref. Schematic diagram FO-1, sheet 6, schematic lines 626-631,
control circuits; and Schematic diagram FO-1, sheet 5, schematic lines 540-542, power circuits).
Shut down ROWPU and generator. Remove the motor starter coil wires. Use a multi meter and check resistance across
the coil connections. It should be near zero.
Replace the coil if resistance is infinity (open) or zero (shorted) (para. 2-25).
Booster pump motor starter (MS7) pulls in but pump does not run. (Ref. schematic diagram FO-1, sheet 6, schematic
lines 625-631, control circuits, and schematic diagram FO-1, sheet 5, schematic lines 540-642 power circuits).
Step 1. Shutdown ROWPU and generator. Turn circuit breaker CB5 (REF: Interconnection diagram FO-2, Sheet 10)
off and disconnet connector panel. Use a multi meter and check continuity across each pair of motor control
contractors. Manually engage the starter contacts during testing. The reading should be zero.
Replace the contactor if any pair is open (para. 2-25).
Step 2. Remove the contactor block from the starter and check for burned, arced over contacts.
Replace the contactor if they are damaged (para. 2-25).
Booster pump motor starter auxiliary contact does not operate correctly. (Ref. Schematic diagram FO-1, sheet 6,
schematic lines 627 and 632).
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Remove the wires from the auxiliary
contact. Use a multimeter and check for correct operation when the starter contacts are manually engaged and when
they are open.
(a) If the hold-in contact (line 627) does not operate correctly, replace the auxiliary contact block (para.
2-25).
(b) If the control contact (line 832) does not operate correctly, replace the auxiliary contact block (para.
2-25).
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