Emerson SCROLL SZO44 - Manual (Page 31)

25 2006SSD-75 R4 (10/10) 24 2006SSD-75 R4 (10/10)
Dual-Compressor Module Troubleshooting
24 2006SSD-75 R4 (10/10)
5.0 t
roubleshootiNg
This section offers tips for troubleshooting.
5.1 Troubleshooting Guide
Refer to Table 4 for recommended solutions to typical problems.
Table 4 Troubleshooting
Problem Recommended Actions
Low Inlet
Gas Pressure
Fault
• Closed gas inlet valve.
• Restricted or insufficient gas supply.
• Blocked inlet filter/screen (located internally on the Compressor Module inlet block).
High Oil
Temperature
Fault
• Blocked air flow across oil cooler.
• Ensure cooling fans are operating when the unit is running and up to temperature; at
approximately 180°F (82°C), fans should start to run at minimum speed.
• Ensure adequate oil level in first-stage separator (see 4.3 - Checking the Oil Level on
page 19).
High Discharge
Pressure Fault
• Restricted discharge and bypass valve fault.
VFD Fault • The drive LED will display the specific fault
5.2 Motor 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
Modules
Phase-to-ground = Infinity