Manitowoc MII 302 Especificaciones descargar pdf (Pagina 162)

160 Part Number STH038 5/12

COMPRESSOR ELECTRICAL DIAGNOSTICS

The compressor does not start or will trip repeatedly

on overload.

Check Resistance (Ohm) Values

NOTE: Compressor windings can have very low ohm

values. Use a properly calibrated meter.

Perform the resistance test after the compressor

cools. The compressor dome should be cool enough

to touch (below 120°F/49°C) to assure that the

overload is closed and the resistance readings will be

accurate.

SINGLE PHASE COMPRESSORS

1. Disconnect power then remove the wires from the

compressor terminals.

2. The resistance values between C and S and

between C and R, when added together, should

equal the resistance value between S and R.

3. If the overload is open, there will be a resistance

reading between S and R, and open readings

between C and S and between C and R. Allow the

compressor to cool, then check the readings

again.

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