Direct Support Troubleshooting Guide (Continued)

Direct Support Troubleshooting Guide (Continued) - TM-10-4610-232-34_65

Direct Support Troubleshooting Guide (Continued) . - TM-10-4610-232-34_67

TM-10-4610-232-34 Water Purification Unit Reverse Osmosis 3 000 GPH Trailer Mounted Flatbed Cargo 22-1/2 Ton 8 Wheel Tandem Model No. WTA-060 Manual
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TM 10-4610-232-34 Table 2-1. Direct Support Troubleshooting Guide (Continued) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 7. Raw water pump circuit breaker trips repeatedly, raw water ground fault trips repeatedly. (Ref. schematic diagram FO-1, sheet 5, schematic Iines 532-537). NOTE This problem is hard to pin point directly as the two circuit breakers are electrically tied together so that what affects one will usually trip the other even though each is sensing different levels of short circuit. The direct-acting circuit breaker will only trip when overcurrents exceed its setpoint, such as a direct bolted short circuit. By contrast, an arcing short circuit may amount to only a fraction of the direct-acting circuit breaker setpoint and not cause it to trip. Arcing faults are typically caused by loose connections, the presence of vermin, rodents, and insects in equipment, or insulation deterioration as a result of mechanical damage, heat, aging, moisture, dust, and other contaminants. Since the arcing type fault usually involves a flow of current in the ground path, the ground fault circuit breaker monitors the ground circuit for current flow. When it senses current in the ground circuit it will trip and also trip out the pump circuit breaker. Under other circuit conditions: balanced, unbalanced, or single-phase load currents, or single or three phase short circuits not involving ground, it will not trip even though the pump breaker does. For these reasons the following troubleshooting steps are very general and success in isolating the problem relies on the electrician to carefully inspect all cables, connectors, and connections for signs of damage or moisture intrusion. In some cases only the substitution of known reliable components will identify the cause. Step 1. Shutdown ROWPU and generator. Refer to electrical drawings in Appendix D. Check all connections on the ground fault interrupt (GFI 1) (REF: Interconnection diagram FO-2, Sheet 13), the current sensor (CS1) (REF: Interconnection diagram FO-2, Sheet 10), and the CB4 (REF: Interconnection diagram FO-2, Sheet 10) shunt wires for tightness. (a) Tighten any loose wires. (b) Refer to para. 2-24 and follow the procedures for testing the ground fault relay. Step 2. If none of the above checks reveal the problem, do the following in the order shown. (a) Replace GFI 1 and CS1 (para. 2-25). (b) Replace CB4 (para. 2-24). 8. Raw water pump circuit breaker will not reset, raw water pump ground fault will not reset. (Ref. Schematic diagram FO-1, sheet 5, schematic lines 532-537). Step 1. Check raw water pump ground fault reset switch. Reset the ground fault and then reset the raw water pump circuit breaker. Step 2. Shut down ROWPU and generator. Refer to electrical drawings in Appendix D and replace circuit breaker CB4 (REF: Interconnection diagram FO-2, Sheet 10) if it will not stay set. Reset the raw water pump circuit breaker. Step 3. Remove wires #204 and #2B from GFI 1 (REF: Interconnection diagram FO-2, Sheet 13). Check continuity, point-to-point, from transformer T1(X1) (REF: Interconnection diagram FO-2, Sheet 10) to wire #204. Repeat the procedure from T1(X2) to wire #2B. (a) Repair any loose or damaged wire (para. 2-20). (b) Replace circuit breakers 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) If all the above checks are okay, replace GFI 1 (para. 2-24). Change 1 2-45

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