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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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