Lennox LGM Series Manual page 28

Failure
Locked Rotor
Braking Mode
Hall Error
Power Module Overheat­
ed
Motor Overheated
Gate Driver Error
Phase Failure
DC Link Voltage Low
DC Link Over-voltage
Line Over-voltage
Line Under-voltage
Communication Error
DC Link Voltage Low
Electronics Temp High
Power Module Temp High
Motor Temp High
DIRECT DRIVE BLOWER MOTOR TROUBLESHOOTING
Error Warning
•
Warning, no error code set,
• Motor start not possible after
Combination of 3 hall signals
• gives false signal after one ro­
•
Motor over-temperature protec­
•
•
Input voltage has phase imbal­
•
Rectified DC link voltage is too
•
Rectified DC link voltage is too
•
•
•
Internal communication failure.
• Not connected with master/
Warning, not low enough to set
•
Warning, not high enough to
set error code, Temperature >
•
Warning, not high enough to
• set error code, Temperature >
Warning, not high enough to
• set error code, Temperature >
TABLE 7
Reason
No changes in hall signals
within 2000ms
20 sec
tation
Temperature > 115 C
tor opens
Internal software fault
ance
low
high
Line voltage too high
Line voltage too low
slave wiring
error code
95 C
105 C
130 C
Page 28
Troubleshoot
Check for obstruction keeping
impeller from rotating
Check for secondary airflow source in
the system causing the impeller to
rotate backwards when off
Measure voltage across each leg,
Check electrical connections
Check operating conditions in blower
compartment, Check for high motor
load (current draw), Check for
corrosion-free and secure electrical
connections
Measure voltage across each leg,
Check electrical connections
Measure voltage across each leg,
Check electrical connections, Repair
low/high voltage leg(s)
Check low voltage wiring connections
Measure voltage across each leg,
Check electrical connections, Repair
low/high voltage leg(s)
Check operating conditions in blower
compartment, Check for high motor
load (current draw), Check for
corrosion-free and secure
electrical connections