Emerson Copeland Scroll K5 Series Application Bulletin page 34

CoreSense
Status LED Status LED Description
Locked Rotor
Yellow Alert LED
Compressor is drawing current without
rotating or four consecutive compressor
4 Flashes
trips after run time of 1-15 seconds
Missing Phase
Yellow Alert LED
Demand signal is present but current is
6 Flashes
missing in one phase
Low Voltage Detected
Yellow Alert LED
Control voltage dips below 85V for
9 Flashes
110V or 170V for 220V
LOCKED OUT ON:
Red Alert LED
High Discharge Line Temperature Trip
See inside label to determine cut out
1 Flash
temp.
LOCKED OUT ON:
4 Consecutive Locked Rotors Detected
Red Alert LED
Compressor is drawing current without
4 Flashes
rotating or four consecutive compressor
trips after run time of 1-15 seconds
LOCKED OUT ON:
Red Alert LED
10 Missing Phase Detections
Demand signal is present but current is
6 Flashes
missing in one phase
LOCKED OUT ON:
Red Alert LED
1 Reverse Phase Detected
Demand signal is present but current is
7 Flashes
not detected in the correct sequence
© 2012 Emerson Climate Technologies, Inc.
Printed in the U.S.A.
Application Engineering
B U L
Diagnostics Module Troubleshooting (Continued)
™
L E T
Status LED Troubleshooting Information
1. Low line voltage (contact utility if voltage at
disconnect is low)
2. Verify presence of all legs of power line
3. Excessive liquid refrigerant in compressor
4. Compressor bearings are seized
5. Verify operating current
1. Improper wiring. Correct order of phases in
wires
2. Failed contactor. Check contacts for pitting
3. Compressor current could be too low. Refer to
specifications.
4. Verify presence of all legs of power line
1. Low line voltage (contact utility if voltage at
disconnect is low)
2. Check wiring connections
1. Possible loss of refrigerant charge
2. Blocked condenser
3. Verify that discharge valve is open
4. On low temperature scroll compressors check
liquid injection
1. Low line voltage (contact utility if voltage at
disconnect is low)
2. Verify presence of all legs of power line
3. Excessive liquid refrigerant in compressor
4. Compressor bearings are seized
5. Verify operating current
1. Improper wiring. Correct order of phases in
wires.
2. Failed contactor. Check contacts for pitting.
3. Compressor current could be too low. Refer to
specifications.
4. Verify presence of all legs of power line
1. Improper wiring. Correct order of phases in
wires.
2. Compressor current could be too low. Refer to
specifications.
3. Verify presence of all legs of power line
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AE4-1383 R5