IB131006EN
Page 53
Effective 07/2017
6-11 TROUBLESHOOTING CHART (Continued Next Page)
SYMPTOM INSPECTION AREA PROBABLE DEFECTS
Fails To Close
• Closing Springs not charged •Control Circuit
• Control Power
(fuse blown or switch off)
• Secondary Disconnects
• Motor Cut-off Switch
(Poor or burned contacts,
Lever not operational)
• Terminals and connectors
(Poor or burned contacts)
• Motor
(Brushes worn or commutator
segment open)
• Mechanism
• Pawls
(Slipping or Broken)
• Ratchet Wheel
(Teeth worn or broken)
• Cam Shaft Assembly
(Sluggish or jammed)
• Oscillator
(Reset spring off or broken)
• Closing Spring charged but
breaker does not close
• No Closing Sound
(Close Coil does
not pick up)
• Control Power
(Fuse blown or switch off)
• Secondary
Disconnects
• Anti-Pump Relay
(Y relay N. C. contact open or
burned or relay picks up)
• Close Coil
(Open or burned)
• Latch Check Switch
(Contact open-bad switch or
trip bar not reset)
• Auxiliary Switch
(b contact open or burned)
• Motor Cut-off
(Contacts open or burned)
• Trip Coil Assembly
(Clapper fails to reset)
Courtesy of NationalSwitchgear.com
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