Manual Manitowoc SM50 (page 177 of 236) (English)

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Part Number 80-0111-9 6/11 177

COMPRESSOR DRAWING LOCKED ROTOR

The two likely causes of this are:

• Defective starting component

• Mechanically seized compressor

To determine which you have:

1. Install high and low side gauges.

2. Try to start the compressor.

3. Watch the pressures closely.

• If the pressures do not move, the compressor

is seized. Replace the compressor.

• If the pressures move, the compressor is

turning slowly and is not seized. Check the

capacitors and relay.

COMPRESSOR DRAWING HIGH AMPS

The continuous amperage draw on start-up should not

be near the maximum fuse size indicated on the serial

tag.

The wiring must be correctly sized to minimize voltage

drop at compressor start-up. The voltage when the

compressor is trying to start must be within 10% of

the nameplate voltage.

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Manitowoc SM50 Manual

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