Emerson SZO56, SZO44 Troubleshooting Guide, Motor Winding Resistance, Motor winding resistance

Dual-Compressor Module Troubleshooting

5.0Troubleshooting

This section offers tips for troubleshooting.

5.1Troubleshooting Guide

Refer to Table 4 for recommended solutions to typical problems.

Table 4	Troubleshooting
Problem		Recommended Actions
Low Inlet		• Closed gas inlet valve.
Gas Pressure		• Restricted or insufficient gas supply.
Fault		• Blocked inlet filter/screen (located internally on the Compressor Module inlet block).
		• Blocked air flow across oil cooler.
High Oil		• Ensure cooling fans are operating when the unit is running and up to temperature; at
Temperature		approximately 180°F (82°C), fans should start to run at minimum speed.
Fault		• Ensure adequate oil level in first-stage separator (see 4.3 - Checking the Oil Level on
		page 19).
High Discharge		• Restricted discharge and bypass valve fault.
Pressure Fault
VFD Fault		• The drive LED will display the specific fault

5.2Motor Winding Resistance

Table 5	Motor winding resistance
Compressor
Model		Motor Winding Resistance
C1A and C3A		Phase-to-phase	= 1.2 to 1.4 ohms
C2A		Phase-to-phase	= 0.7 ohms
All Compressor		Phase-to-ground	= Infinity
Modules

25 2006SSD-75 R4 (10/10)