TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 6.
Step 7.
Step 8.
Step 9.
(e) Replace relays K15, K21 or K22 if their contact does not show continuity (para. 2-23).
(f) Replace/repair the booster pump starter MS7 if all the above checks and repairs are okay (para. 2-25).
Shut down the ROWPU. Open the control panel and repower the control panel. Check the indicating
plungers on relays K2 and K3 (REF: Interconnection diagram FO-2, Sheet 6). They should be out. Check the
indicating plunger on K4 (REF: Interconnection diagram FO-2, Sheet 6). It should be in.
(a) if the indicating plungers on K2 of K3 are in, refer to operating mode circuit troubleshooting (control
circuits malfunction 3).
(b) If the plunger on K4 is out, refer to system on/system off circuit troubleshooting (control circuits
malfunction 1).
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Check continuity, point-to-
point, from PB12(1A4) to relay K22(A4Y). Push the indicating plungers on relay K4 and on the booster pump
starter MS7 when testing continuity across their contacts.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace relays K2, K3 or K4 if their respective contacts do not show continuity when tested (para.
2-23).
(c) Replace/repair starter MS7 if its contact does not show continuity (para. 2-25).
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.
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Check continuity, point-to-
point, from the power distribution block (PDB) to J21 on the following lines: AL1 to J21A, AL2 to J21 B, and
AL3 to J21C. Depress the operating plunger MS7 when checking across its contacts. Disconnect the J21
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)
(b)
(c)
(d)
2. Booster pump will not start in system “NORMAL” when flushing the media filter. (Schematic diagram FO-1, sheet 6,
Repair any loose or damaged wire (para. 2-20).
Replace circuit breaker CB5 (REF: Interconnection diagram FO-2, Sheet 10) if open on any phase
(para. 2-25). Normally closed.
If MS1 (REF: Interconnection diagram FO-2, Sheet 10) shows open on any phase, replace/repair it
(para. 2-25).
Replace/repair J21 if faulty (para. 2-21).
schematic line 625).
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D and remove the #243 wire from the
booster pump starter, MS7 (REF: Interconnection diagram FO-2, Sheet 10). Check continuity, point-to-point, from
relay K21(A4Y) (REF: Interconnection diagram FO-2, Sheet 6) to wire #243 on MS7. Push in PB16 (REF:
Interconnection diagram FO-2, Sheet 12), media filter flush switch, when testing its contact for continuity.
NOTE
PB16 is a “Push On, Push Off” switch. If continuity is not obtained in one position, push
the switch again and check for continuity.
(a)
(b)
(c)
Repair any loose or damaged wires (para. 2-20).
Replace PB16 if it does not have continuity after pushing the switch twice during
testing (para. 2-22).
If the MS8-2M (REF: Interconnection diagram FO-2, Sheet 10) contact is open,
replace the contact (para. 2-25).
Change 1 2-65
