TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
(d) Replace switch SS5 (REF: Interconnection diagram FO-2, Sheet 11) if open (para. 2-22).
(e) Replace/repair connector J11 if open (para. 2-21 ).
Step 6. Remove wire #326 and #2A from the MS1 coil. Check continuity from J11C to MS1 (wire 326) and from
transformer T1(X2) to MS1 (wire 2A).
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace/repair J11 if open (para. 2-21).
(c) If all the above checks are satisfactory, replace/repair MS1 (para. 2-25).
Step 7. Check generator voltage on all three phases. It must be 435-445 VAC on each phase.
(a) Adjust to correct voltage.
(b) If voltage is not correct on all three phases, refer to generator troubleshooting.
Step 8. Check for correct voltage by starting the raw water pump. Alternately, turn on both switches for the
distribution pump and note if it runs.
If the 3 phase motors listed do not operate, go to step 10.
Step 9. Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Check continuity, point-to-
point, from the power distribution block (PDB) (REF: Interconnection diagram FO-2, Sheet 10). to J20 (REF:
Interconnection diagram FO-2, Sheet 16) on the following lines: AL1 to J20A, AL2 to J20B, and AL3 to J20C.
Depress the operating plunger MS1 when checking across its contacts. Disconnect the J20 connector when
testing.
NOTE
When checking continuity in the power circuits it is important to watch the wire numbers
on each phase. Each wire is tagged identically on both ends, but in some instances, a #1
phase wire will enter the top of a starter or circuit breaker and come out the bottom of the
same device as a #2 phase wire. This is done to change the rotation of a motor so that its
associated pump will turn in the correct direction. Any two wires may be interchanged to
accomplish this rotational change.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace circuit breaker CB2 (REF: Interconnection diagram FO-2, Sheet 10) if open on any phase
(para. 2-25).
(c) If MS1 shows open on any phase, replace/repair it (para. 2-25).
(d) Replace/repair J20 if faulty (para. 2-21).
Step 10. Shut down the ROWPU and generator. Disconnect the cable from the ROWPU to the generator, at the
generator end. Check continuity, point-to-point, from the generator end of the cable to the power distribution
block (PDB) on each phase.
(a) Replace the main power cable if open on any phase (para. 2-18).
(b) Replace circuit breaker CB1 (REF: Interconnection diagram FO-2, Sheet 10) if open (para. 2-25).
(c) Repair any loose or damaged wire (para. 2-20).
(d) If the above checks have not revealed the problem, refer to generator troubleshooting.
Air compressor motor hums but will not turn. (Ref. Schematic diagram FO-1, sheet 5, schematic lines 518-521).
Step 1. Check generator voltage on all three phases. It must be 435-445 VAC on each phase.
(a) Adjust to correct voltage.
(b) If voltage is not correct on all three phases, refer to generator troubleshooting.
Step 2. Check for correct voltage by starting the raw water pump. Alternately, turn on both switches for the
distribution pump and note if it runs.
If the 3 phase motors listed do not operate, go to step 4.
Step 3. Shut down ROWPU and generator. Refer to electrical drawings in Appendix D and check continuity,
point-to-point, from the power distribution block (PDB) (REF: Interconnection diagram FO-2, Sheet 10) to
J20 (REF: Interconnection diagram FO-2, Sheet 16) on the following lines: AL1 to J20A, LA2 to J20B, and AL3
to J21C (REF: Interconnection diagram FO-2, Sheet 16). Depress the operating plunger MS1 (REF:
Interconnect ion diagram FO-2, Sheet 10) when checking across its contacts. Disconnect the J20 connector
when testing.
2-62
Change 1
