HP Anab EQ5 - Manual (Page 96)

EQ5 AC Drive Operations Manual
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TECO – Westinghouse Motor Company Trouble Shooting Chart 90
6-3.Trouble shooting
6-3-1 Protective function activation
(1) Overcurrent
YES
NO NO
NO
YES
NO
NO
NO
YES
YES
YES
Are the motor connecting terminals (U, V, W) short-circuited or grounded?
Reduce the load or increase
the inverter capacity.
Is the load excessive?
Can the torque boost
amount be reduced?
Remove the short-circuit
and ground fault.
Prolong time settings.
Reduce the load or increase
the inverter capacity.
Is the torque boost
correct?
Reduce the torque boost.
Is the acceleration time
setting too short
compared with the load?
YES
Has the load changed
suddenly?
NO
NO
NO
YES
NO
Can the deceleration time
setting be prolonged? YES
NO
Reduce the load or increase
the inverter capacity.
YES
Overcurrent
during acceleration
OC1
Is the deceleration time
setting too short compared
with the load?
Can the acceleration time
setting be prolonged?
YES
Overcurrent
during deceleration
OC2
Overcurrent
running at constant speed
OC3
NO
Faulty inverter or error
due to noise.
Consult with TWMC.
The braking method
requires inspection.
Contact TWMC.
(2) Ground fault
Note: The ground fault protective function is only available for inverters rated 40HP/CT,
50HP/VT and above.
(3) Fuse brown
Possible short-circuit
within the inverter.
Contact TWMC.
Fuse blown
FUS
Ground fault
EF
Remove the grounded part.
YES
Faulty inverter or error due to noise.
Contact TWMC.
NO
Is a part in the inverter output
circuit (cable, motor) grounded?