TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Step 8.
Step 9.
Push the chemical pump start pushbutton,
If the chemical pumps start running (as indicated by relay K7 (REF: interconnection diagram FO-2, Sheet
7) pulling in or a pulsing noise from the pumps), go to step 4.
Observe the indicating plungers on the following relays: K3 should be out, K4 in, K21 in, and K22 (REF:
Interconnection diagram FO-2, Sheet 6) in.
(a) If K3 is in, refer to operation mode troubleshooting.
(b) If K4 is out, refer to system on/system standby circuit troubleshooting.
(c) If K21 or K22 is out, refer to pressure switch troubleshooting (malfunction 1 and 4 respectively).
Observe the indicating plunger on K12 (REF: Interconnection diagram FO-2, Sheet 6). it should be out.
(a) If it is in, refer to backwash circuit troubleshooting.
(b) If the chemical pumps ran in step 2, shut down the ROWPU and the generator and go to step 6.
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Check continuity, point-to-
point, from transformer T1(X1) (REF: interconnection diagram FO-2, Sheet 10) to PB6(1B2) (REF:
interconnection diagram FO-2, Sheet 11). Push in the indicating plungers on relays K4, K21 and K22 when
checking across their contacts.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace circuit breaker CB7 (REF: Interconnection diagram FO-2, Sheet 8) if open (para. 2-23).
(c) Replace switch PB3 (REF: Interconnection diagram FO-2, Sheet 11) if open (para. 2-22).
(d) Replace switch PB4 (REF: Interconnection diagram FO-2, Sheet 12) if open (para. 2-22).
(e) Replace relay K3 if its contact is open (para. 2-23).
(f) Replace relay K4, K21 or K22 if their respective contacts do not close when the indicating plunger is
pushed in (para. 2-23).
Remove the #231 wire from MS3, Check continuity, point-to-point, from PB6(1B2) (REF: interconnection
diagram FO-2, Sheet 11) to MS3 (wire #231), Push in PB7 (REF: interconnection diagram FO-2, Sheet 11)
when checking across its terminals.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace PB6 if open (para. 2-22).
(c) Replace PB7 if it does not close when pushed in (para. 2-22).
(d) Replace K12 if open (para. 2-23). Normally closed.
Check continuity, point-to-point, from transformer T1(X2) to the MS3 neutral side.
(a) Repair any loose or damaged wire (para. 2-20).
(b) If all the preceding checks and repairs are satisfactory, replace/repair MS3.
Check the indicating plunger on K1. it should be in.
If it is out, refer to operation mode circuit troubleshooting.
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Check continuity. point-to-
point, from PB7(1A4) to PB7(1A3) and K12(A1Y). Depress the indicating plunger on MS3 and K1 when
checking continuity across their contacts.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace relay K1 if its contact does not show continuity when the indicating plunger is depressed
(para. 2-23).
(c) Replace/repair MS3 if its contact does not show continuity.
Step 10. 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 11. Check system air pressure and use an air manifold drain valve to lower it below 1400 psig. Turn the air
compressor switch on and note if the air compressor runs. 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 13.
Step 12. Shut down the ROWPU and generator. Refer to electrical drawings in Appendix D. Check continuity,
point-to-point, from the power distribution block (PDB) to J21 (REF: interconnection diagram FO-2, Sheet
16) on the following lines: AL1 to J21E, AL2 to J21F and AL3 to J21G. Depress the operating plunger on MS3
when checking across its contacts. Disconnect the J21 connector when testing.
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