TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
Corrective ACTION
2.
Step 3. Check the wires removed in step 2 for continuity and damage to their next connection point.
Repair any loose or damaged wires (para. 2-20).
Step 4. Remove the wires from 2A3 and 2A4 on SS2. Check that this part of the switch is open when SS2 is in the
system on position.
Replace SS2 if the contact is closed (para. 2-22).
Step 5. Shut down ROWPU and generator. Refer to electrical drawings in Appendix D and place SS2 in the system
standby position. Remove the K1 and K2 wire from K5 (REF: interconnection diagram FO-2, Sheet 7). Check
continuity, point-to-point, from transformer T1(X1) to relay K5(K1). Repeat procedure from T1(X2) to relay
K5(K2).
(a) Repair any loose or damaged wires (para. 2-20).
(b) Replace circuit breaker CB7 if open (para. 2-23).
(c) Replace switch PB3 if open (para. 2-22).
(d) Replace switch SS2 if open (para. 2-22).
(e) If all continuity checks are good but problem still exists, replace relay K5 (para. 2-23).
Step 6. Remove the wires from A1Z/A1Y on relay K5. Check for continuity across the Al contact when the indicating
plunger on K5 is pushed in.
If there is no continuity, replace K5 (para. 2-23).
Step 7. Check the wires removed in step 6 for continuity and damage to their next connection point.
Repair any loose or damaged wire (para. 2-20).
Step 8. Remove the wires from 1B2 and 1B1 on SS2. Check that this part of the switch is open when SS2 is in the
system standby position.
Replace SS2 if the contact is closed (para. 2-22).
Operation mode circuits do no work - backwash mode starts at step 5- clean mode starts at step 9. (Ref. Schematic
diagram FO-1. sheet 6. schematic lines 613-618. 607-609).
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Shut down ROWPU and generator.’ Refer to electrical drawings in Appendix D and place SS3 (REF:
Interconnection diagram FO-2, Sheet 12) in the system normal position. Remove the K1 and K2 wires from K1
(REF: Interconnection diagram FO-2, Sheet 6). Check continuity, point-to-point, from transformer T1(X1)
(REF: Interconnection diagram FO-2, Sheet 10) to relay K1(K1). Push initiate, PB4 (REF: Interconnection
diagram FO-2, Sheet 12), when checking continuity across it. Repeat the procedure from T1(X2 to relay
K1(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).
(c) Replace switch PB3 (REF: Interconnection diagram FO-2, Sheet 11) if open (para. 2-22).
(d) Replace switch SS3 if open (para. 2-22).
(e) Replace PB4 if it does not show continuity when pressed (para. 2-22).
Check continuity, point-to-point, from PB4(3A4) to relay K1(K1). Depress the indicating plunger on K1 when
checking across its contacts.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace K1 if its contact does not show continuity when the plunger is depressed (para. 2-23).
(c) Replace K2 if its contact is open (para. 2-23).
(d) Replace K3 (REF: Interconnection diagram FO-2, Sheet 6) if its contact is open (para. 2-23).
Remove the wires from A2X/A1Y on relay K1. Check for continuity across the Al contact when the indicating
plunger on K1 is pushed in.
If there is no continuity, replace K1 (para. 2-23).
Check the wires removed in step 3 for continuity and damage to their next connection point.
(a) Repair any loose or damaged wire (para. 2-20).
(b) If all the checks performed in steps 1-4 are satisfactory, replace K1 (para. 2-23).
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D and place SS3 in the backwash
position. Remove the K1 and K2 wires from K2. Check continuity, point-to-point, from transformer T1(X1) to
relay K2(K1). Push initiate, PB4, when checking continuity across it. Repeat the procedure from T1(X2) to
relay K2(K2).
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