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Page 175

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Condition

Possible Cause

Suggested Remedy

| Unnecessary tripping (when tripping should not occur) |

Calibration set too low

| Set device or relay for proper value according to ampere load of circuit. |

| Worn latches | Replace with new parts.

| Failure to close or to latch close |

| Mechanism binding or sticking: Lack of lubrication |

Lubricate mechanism.

| Improper adjustment of breaker mechanism |

Adjust toggles, links, stops, buffers, springs, etc.

| Burnout of closing coil: Operator holding control switch closed too long |

| Replace coil and educate operator, or rewire to include an auxiliary switch that automatically cuts off closing coil as soon as breaker closes. |

| Closing relay sticking | Check or adjust closing relay.
| Cut-off switch operating too soon | Adjust switch to delay cut-off and allow breaker to close fully.

| Cut-off switch operating too late, causing the breaker to bounce open |

| Readjust switch to reduce power at end of stroke and eliminate bounce. |

| Insufficient control voltage: Too much drop in leads |

Install larger wires. Improve contact at connections.

On ac control: poor regulation

| Install larger control transformer. Check rectifier to be sure it is delivering adequate dc voltage from adequate ac supply. |

| On dc control: battery not fully charged or in poor condition |

Give battery a sustaining charge or replace cells.

| Blown fuse in control circuit; faulty connection or broken wire in control circuit; damaged or dirty contacts in control switch |

| Replace blown fuse. Repair faulty connections or broken wire. Dress or replace damaged contacts or clean dirty contacts in control switch. |

Insufficient oil (in tanks) | Leakage of oil | Find leak and repair. Tighten up joints in oil lines.
| Oil thrown during operation | Fill tanks to proper level.

Dirty oil

Carbonization from many operations

| Drain dirty oil, and filter or replace with new oil. Clean inside of tank and internal parts of breaker. |

Moisture in oil | Condensation of moist atmosphere | Drain and filter oil or put in new oil. Check mufflers.

| Entrance of water from rain or other source |

Locate and repair source of water entrance.

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