TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Shut down ROWPU and generator. Refer to electrical drawings in Appendix D and check continuity,
point-to-point, from transformer T1(X1) (REF: Interconnection diagram FO-2, Sheet 10) to J11A(REF:
Interconnection diagram FO-2, Sheet 9). Repeat the procedure from T1(X2) to relay K24(K2) (REF:
Interconnection diagram FO-2, Sheet 7). Remove the K1/K2 wires on K24 before testing.
(a) Repair any loose or damaged wire (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 emergency stop PB3 (REF: Interconnection diagram FO-2, Sheet 11) if open (para. 2-22).
Normally closed.
(d) Replace/repair connector J11 if faulty (para. 2-21).
Step 3. Check continuity, point-to-point, from J11N to K24(K1). Depress the indicating plungers on K6(REF:
Interconnection diagram FO-2, Sheet 7) and K24 when testing continuity across their contacts.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace/repair connector J11 if faulty (para. 2-21).
(c) Replace relay K6 or K24 if their set of contacts does not show continuity when the indicating plunger is
depressed (para. 2-23).
(d) Replace relay K24 if all above checks have not pin pointed the problem (para. 2-24).
11. Media filters high differential light or horn does not work. (Ref. Schematic diagram FO-1, sheet, 9, schematic lines
912-913 and schematic diagram FO-1, sheet 10, schematic line 1007).
NOTE
Refer to malfunction 10 and 12 for additional troubleshooting. Also, see light test and
alarm circuit troubleshooting.
Step 1. Shut down the ROWPU and generator. Refer to electrical drawings in Appendix D. Remove the wires from
A3X/A3Y and A2X/A2Y on relay K24 (REF: Interconnection diagram FO-2, Sheet 7). Check for continuity
across each contact with the indicating plunger of K24 out. Push the indicating plunger in and check that
there is no continuity across the contact.
If the continuity checks are not as noted above, replace relay K24 (para. 2-23).
Step 2. Check the wires that were removed in step 1 for looseness or damage at their preceding connections.
Repair any loose or damaged wires (para. 2-20).
12. Media filter plugged light is on at a differential less than 20 psig or, is not on at a pressure greater than 30 psig.
Test media filter differential switch (PDSH2) for accuracy. Disconnect P24(REF: interconnection diagram FO-2,
Sheet 14) from the pressure switch panel. Disconnect the pressure sensing lines from the switch. Remove the cover on
the switch and tag/remove the wires from the pressure switch. Check for internal water leakage. Set a multimeter to the
Ohms x 1 scale and attach the leads to the switch terminals that the wires were on. Connect a dead-weight tester or
another known calibrated pressure control device to the switch high pressure (or inlet) port. The multimeter should
read zero resistance with no pressure on the inlet pressure port. Slowly apply pressure to the switch. The switch
should open on an increasing pressure of 24 to 26 psig.
(a) Replace the switch if there is internal leakage (para. 2-27).
(b) Adjust the switch to the correct setting if it does not actuate as described above. Remove the
adjustment cover and turn the adjuster clockwise to increase the actuation point counterclockwise to
lower it (para. 2-29).
(c) Replace the switch if it cannot be adjusted (para. 2-27).
(d) If the switch checks are okay, check the accuracy of the gauge that led to this malfunction.
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