TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ALARM CIRCUITS.
~ 1. Alarm test does not work. (Ref. Schematic diagram FO-1, sheet 10, schematic lines 1002 and 1013).
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 J12A (REF: Interconnection diagram FO-2,
Sheet 9), T1(X1) to J12F and T1(X2) J12J.
(a) Repair any loose or damaged wires (para. 2-20).
(b) Replace circuit breaker CB7 or CB10 (REF: Interconnection diagram FO-2, Sheet 8) if either is open
(para. 2-23). Normally closed.
(c) Replace switch PB3 (REF: Interconnection diagram FO-2, Sheet 11) or PB17 (REF: Interconnection
diagram FO-2, Sheet 12) if either is open (para. 2-22).
(d) Replace/repair connector J12 if faulty (para. 2-21).
2. Alarm(s) will not reset. (Ref. Schematic diagram FO-1, sheet 6, schematic line 636 and schematic diagram FO-1, sheet 9,
schematic lines 902-936.
Step 1.
Step 2.
Step 3.
NOTE
The alarm will not reset if conditions which cause the alarm have not been fixed. The
chemical tanks and the clean/flush tank must have sufficient solution in them to raise the
level switches. Operating pressure must be below the setpoint of pressure switches or
they will not reset. Check the operating pressure of the ROWPU against the setpoints
shown on the electrical schematic before troubleshooting.
Shut down the ROWPU. Open the control panel and close the main circuit breaker CB1 (REF:
Interconnection diagram FO-2, Sheet 10). Pull the emergency stop pushbutton out. Watch relay K6 (REF:
Interconnection diagram FO-2, Sheet 7) and push the alarm reset. The indicating plunger on it should go in
and then come out when the reset button is released. All alarm lights should turnoff (if alarm conditions noted
above are met) with the exception of low feed pressure.
(a) If the indicating plunger does not go in, go to step 2.
(b) If the plunger goes in but does not come out and the results are not as noted above, go to step 3.
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Remove the K1 and K2 (REF:
Interconnection diagram FO-2, Sheet 6) wires from K6. Check continuity, point-to-point, from transformer
T1(X1) (REF: Interconnection diagram FO-2, Sheet 10) to K6(K1) wire. Push alarm reset during testing.
Repeat the procedure from T1(X2) to relay K6(K2).
(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).
Normally closed.
(c) Replace switch PB3 or PB15 (REF: Interconnection diagram FO-2, Sheet 11) if open (para. 2-22).
(d) Replace relay K6 if continuity checks are good (para. 2-23).
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Locate the alarm(s) that did
not turn off and note the K6 contacts for that particular alarm. (Example: Product high pressure K6 contacts
are A3X/A3Y.) Disconnect those wires from the K6 relay. Test continuity across the disconnected contacts by
depressing the K6 indicating plunger.
(a) If the relay contacts show continuity when the plunger is pushed in, refer to individual pressure switch
troubleshooting.
(b) If there is no continuity across the contacts when the plunger is pushed in, replace relay K6 (para.
2-23).
NOTE
K6 contacts A1X/A1Y, B3X/B3Y and B4X/B4Y are the contacts used to reset the level
switches and feed low pressure switch. Test all three contacts when checking continuity
on relay K6 for those items.
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