Is a bad capacitor preventing a motor's starting?
A bad run capacitor will also affect the motor's ability to start.
You can also look for signs that indicate a problem with the capacitor in a motor. A motor with a short-circuited cap will often start and run but have lower starting torque and full-load rpms than normal.
Why does a motor require a start capacitor? A capacitor connected in series with the secondary winding creates a magnetic field that is lower than the primary winding's. This creates a start torque, and the motor begins to turn. Start capacitors are capacitors that enable a motor's rotation to begin.
The same goes for a motor starter capacitor.
A start capacitor is required for many single-phase compressors. Sometimes, these capacitors can fail and cause a compressor not to start. Overheating can be a primary reason for a failing start capacitor. Failure of a start capacitor will occur if it is left in the circuit for too long.
What happens if the run capacitor is damaged?
A hard starting is the most common problem bad capacitors can create. Most cases of capacitor failure, including damage to the capacitor or loss of charge, will require replacement.
- AC not blowing cold air.
- AC takes a while to start once you turn it on.
- Humming sound coming from your air conditioner.
- AC shuts off on its own.
- AC won't turn on.
- Cracks or bulging of the capacitor.
- A burning odor coming from the capacitor.
- Smoke coming from the capacitor.
- Oozing fluid around the capacitor and circuit board.
- Insufficient charge when checked with a multimeter.
- Consult the owner's manual for your air conditioner to see if it lists the capacitor size it requires.
- Multiply the full load amps by 2,650.
- Multiply the working power of the motor (it should be listed in kilowatts in your owner's manual) by the power factor in table 1 included in the Resource below.
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