TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 4.
Step 5.
Step 6.
Step 7.
Step 8.
If the control paneI is powered up, turn it off and turn it back on. Watch relay K20 (REF: Interconnection
diagram FO-2, Sheet 6) when the alarm reset is pushed. The indicating plunger should go in and stay in. All
the level switch alarms should turn off if the tanks have enough solution in them to raise the level switch. The
only alarm light left on should be the feed low pressure light.
(a) If the indicating plunger does not go in, go to step 5.
(b) If the indicating plunger goes in but the results are not as noted above, go to step 6.
(c) If the plunger goes in and comes back out, go to step 7.
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D and remove the K1 and K2
wires from K20. Check continuity, point-to-point, from transformer T1(X1 to the K20(K1) wire. Push alarm
reset during testing. Repeat the procedure from T1(X2) to relay K20(K2).
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace circuit breaker CB7 if open (para. 2-23).
(c) Replace circuit breaker CB10 (REF: Interconnection diagram FO-2, Sheet 8) if open (para. 2-23).
(d) Replace switch PB3 if open (para. 2-22).
(e) Replace relay K20 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 K20 contacts for that particular alarm. (Example: Chlorine low level K20 contacts are
B1X/B1Y.) Disconnect those wires from the K20 relay. Test continuity across the disconnected contacts by
depressing the K20 indicating plunger.
(a) If the relay contacts show continuity when the plunger is pushed in, refer to individual level switch
troubleshooting.
(b) If there is no continuity across the contacts when the plunger is pushed in, replace relay K20 (para.
2-23).
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Disconnect the wires from the
A3 contact on relay K20. Depress the indicating plunger on K20 and check continuity across the A3 contacts.
If there is no continuity across the A3 contact, replace relay K20 (para. 2-23).
Reconnect the wires on the A3 contact of K20. Check continuity, point-to-point, from transformer T1(X1) to
TDK5 (terminal 9) (REF: Interconnection diagram FO-2, Sheet 8). Push in the indicating plunger of K20
during testing. Check continuity from TDK5 (terminal 10) to K20(K1). Check continuity from T1(X2) to
K20(K2).
(a) Repair any loose or damaged wire (para. 2-20).
(b) If all the continuity checks are okay, replace TDK5 (para. 2-23).
3. Alarm horns turn on when initiate is pushed.
Step 1. Refer to alarm circuit troubleshooting, malfunction 2, “alarm will not reset.”
Step 2. Shut down ROWPU and generator. Remove the wires on contacts A2Y/A2X and A1X/A1Y of relay K20.
Check that continuity is broken on each contact when the indicating plunger of K20 is pushed in.
Replace K20 if either contact does not open (para. 2-23).
4. Alarm horn did not sound and ROWPU shut down. Alarm horns did not sound and chemical tanks ran dry.
NOTE
This situation is normal whenever alarm reset has been pushed and any chemical tank,
the clean/flush tank, or feed low pressure switch has not been satisfied. Clear those
alarms before troubleshooting this symptom.
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