TM 10-4610-232-34Table 2-1. Direct Support Troubleshooting Guide (Continued)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONStep 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 indicatingplungers on relays K2 and K3 (REF: Interconnection diagram FO-2, Sheet 6). They should be out. Check theindicating 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 (controlcircuits malfunction 3).(b) If the plunger on K4 is out, refer to system on/system off circuit troubleshooting (control circuitsmalfunction 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 pumpstarter 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, andAL3 to J21C. Depress the operating plunger MS7 when checking across its contacts. Disconnect the J21connector when testing.NOTEWhen checking continuity in the power circuits it is important to watch the wire numberson each phase. Each wire is tagged identically on both ends, but in some instances, a #1phase wire will enter the top of a starter or circuit breaker and come out the bottom of thesame device as a #2 phase wire. This is done to change the rotation of a motor so that itsassociated pump will turn in the correct direction. Any two wires may be interchanged toaccomplish 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 thebooster pump starter, MS7 (REF: Interconnection diagram FO-2, Sheet 10). Check continuity, point-to-point, fromrelay 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.NOTEPB16 is a “Push On, Push Off” switch. If continuity is not obtained in one position, pushthe 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 duringtesting (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
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