TABLE 13
DIRECT DRIVE BLOWER MOTOR TROUBLESHOOTING
Failure Error Warning Reason Troubleshoot
Locked Rotor o
No changes in hall signals within
2000ms
Check for obstruction keeping impeller from rotating
Braking Mode o
Warning, no error code set, Motor
start not possible after 20 sec
Hall Error o
Combination of 3 hall signals gives
false signal after one rotation
Measure voltage across each leg, Check electrical connections
Power Module Overheated o
o
C
Check operating conditions in blower compartment, Check for
secure electrical connections
Motor Overheated o
Motor over-temperature protector
opens
Gate Driver Error o Internal software fault Measure voltage across each leg, Check electrical connections
Phase Failure o Input voltage has phase imbalance
Measure voltage across each leg, Check electrical
DC Link Voltage Low o
DC Link Over-voltage o
Line Over-voltage o Line voltage too high
Line Under-voltage
o
Line voltage too low
Communication Error
Internal communication failure. Not
connected with master/slave wiring
Check low voltage wiring connections
DC Link Voltage Low o
Warning, not low enough to set error
code
Measure voltage across each leg, Check electrical
Electronics Temp High o
Warning, not high enough to set
o
C
Check operating conditions in blower compartment, Check for
secure electrical connections
Power Module Temp High o
Warning, not high enough to set
o
C
Motor Temp High o
Warning, not high enough to set
o
C
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