Eaton DST-2-VR+ Series Instruction Book page 34

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DST-2-VR
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VR-Series Replacement Circuit Breaker
Tablt 6.3. Troubltshooting Chart
SYMPTOM
FAILS TO CLOSE
Closing Springs Not Charged
Closing Springs Not Charged
Circuit Breaker Does Not Close
UNDESIRABLY CLOSES
FAILS TO CLOSE
No Trip Sound
Trip Sound But No Trip
UNDESIRABLY TRIPS
34 Instruction Book
INSPECTION AREA
Control Circuit
Mechanism
Control Circuit
(Close Coil does not pick up)
Closing sound but no close
Control Circuit
Mechanism
Control Circuit
Trip Mechanism
Trip Mechanism
Vacuum Interrupter (One Or More Welded)
Control Circuit
Mechanism
IB182942EN July 2018 www.eaton.com
PROBABLE DEFECTS
• Control Power (Fuse blown or switch off)
• Secondary Disconnect Contacts
• 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)
• Pawls (Slipping or broken)
• Ratchet Wheel (Teeth worn or broken)
• Cam Shaft Assembly (Sluggish or jammed)
• Oscillator (Reset Spring off or broken)
• Control Power (Fuse blown or switch off)
• Secondary Disconnect Contacts
• 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)
• Pole Shaft (Not open fully)
• Trip Latch Reset Spring (Damaged or missing)
• Trip Bar-D Shaft (Fail to remain reset)
• Trip Latch-Hatchet (Fails to remain reset)
• Trip Floor Tripper (Fails to remain reset)
• Close Latch (Binding)
• Close Latch Roller (Binding)
• Trip Circuit Energized
• Close Circuit (CS/C getting shorted)
• Close Release Latch (Fails to reset)
• Close Floor Tripper (Fails to reset)
• Control Power (Fuse blown or switch off)
• Secondary Disconnect Contacts
• Auxiliary Switch (A contact not making poor or burned)
• Trip Coil (Burned or open)
• Terminals and connections (Poor or burned or open)
• Trip Clapper (Jammed)
• Trip Bar, Trip Latch (Jammed)
• Pole Shaft (Jammed)
• Operating Rod Assembly (Broken or pins out)
• Control power (CS/T Switch, remains made)
• Trip Coil Clapper (Not resetting)
• Trip Bar or Trip Latch (Poor engagement of mating or worm surfaces)
• Trip Bar Reset Sprint (Loss of torque)