TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
WARNING
Electrical high voltage can cause serious injury or death. Some tests performed in
troubleshooting required power to be connected. Always take proper measure to ensure
personal safety.
NOTE
Ensure that all circuit breakers are set. Refer to electrical drawings in Appendix D.
NOTE
Several of the following procedures require that the ROWPU be setup in “NORMAL”
operating mode to check if the pump works properly. If it is known that the pump
functions properly in that mode, it is not necessary to check again.
1. Booster pump will not start - system running normal. (Ref. Schematic diagram FO-1, sheet 6, schematic Iines 625-632,
control circuits schematic diagram FO-1, sheet 5, schematic lines 540-542, power circuits).
Step 1. Shut down the ROWPU. Open the control panel. Check that the overload reset button on MS7 (REF:
Interconnection diagram FO-2, Sheet 10) is in by pushing it.
(a) If the reset button is in, go to step 3.
(b) If the button is out and will not reset, replace the overload heaters on MS7 (para. 2-25) and then go to
step 2.
(c) If the reset button is out, but resets when pushed, adjust the door reset assembly for MS7. Refer to
para. 2-24 and then go to step 2.
Step 2. Check each lead, 7T1, 7T2 and 7T3 from MS7 to J21 (REF: Interconnection diagram FO-2, Sheet 16) for
damage and tightness.
Repair any loose or damaged wires (para. 2-20).
Step 3. Refer to the operator’s manual and start ROWPU in system “NORMAL”. Observe MS7 when the Booster
Pump start switch is pushed. The indicating plunger should go in and stay in, which indicates the control
circuits are working properly.
(a) If the indicating plunger goes in and stays in, go to step 8.
(b) If the indicating plunger goes in, but comes out when the start button is released, go to step 6.
Step 4. Observe the indicating plungers on relays K15 (REF: Interconnection diagram FO-2, Sheet 7), K21 and K22
(REF: Interconnection diagram FO-2, Sheet 6). They should all be in.
If any of the indicating plungers aer out, refer to pressure switch troubleshooting as follows:
K15 — Feed Low Pressure Malfunction 16
K21 — High Pressure Pump High Pressure Malfunction 1
K22 — Product High Pressure Malfunction 4
Step 5. Shutdown ROWPU and generator. Refer to electrical drawings in Appendix E and remove the #243 wire from
MS7 coil. Check continuity, point-to-point, from transformer T1(X1) to wire #243 on MS7. Repeat the
procedure from T1(X2) (REF: Interconnection diagram FO-2, Sheet 10) to the #2B wire on MS7. Depress
switch PB12 (REF: Interconnection diagram FO-2, Sheet 11) when checking across its contact. Push in the
indicating plungers on relays K15, K21 and K22 when checking continuity across their respective contacts.
(a) Repair any loose or damaged wires (para. 2-20).
(b) Replace circuit breaker CB7 (REF: Interconnection diagram FO-2, Sheet 8) if open (para. 2-23).
Normally closed.
(c) Replace switch PB3 (REF: Interconnection diagram FO-2, Sheet 11) if open (para. 2-22), Normally
(d) Replace switch PB4 (REF: Interconnection diagram FO-2, Sheet 12), PB11 or PB12 (REF:
Interconnection diagram FO-2, Sheet 11) if open (para. 2-22
c l o s e d .
2-64
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