Ptc Starter (Positive Temperature Coefficient) - LG LFX21960ST Training Manual

REFRIGERATOR COMPRESSOR
PTC STARTER
The PTC (Positive Temperature Coefficient) is a non-contact semiconductor
starting device which uses ceramic material consisting of BaTiO . The higher the
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temperature is, the higher the resistance value. These features are used as a
starting device for the Motor.
The PTC is attached to the sealed compressor and is used for starting the motor.
The compressor is a single-phase induction motor. At startup, the PTC allows
current flow to both the start main windings.
It requires approximately 5 minutes for the pressure to equalize before the
compressor can restart. The PTC device generates heat during operation.
Therefore, it must be allowed to cool before the compressor can restart.
If the compressor attempts to restart before the PTC device is cooled, the PTC
device will allow current to flow only to the main winding. The OLP will open
because of the over current condition. This same process will continue (3 to 5
times) when the compressor attempts to restart until the PTC device has cooled.
The correct OLP must be properly attached to prevent damage to the
compressor. Parts may appear physically identical but could have different
electrical ratings. Replace parts by part number and model number. Using an
incorrect part could result in damage to the product, fire, injury, or possibly death.
LFX21960ST/LFX25960xx Page 32 of 75 TRAINING MANUAL