Danfoss VFD500-090G/110PT4

VFD500 high performance vector control frequency inverter user manual Chapter6 Fault diagnosis and solutions
Over current
at constant
speed
4
1: The output circuit is grounded
or
short circuited.
2: Motor auto-tuning is
notperformed.
3: The voltage is too low.
4: A sudden load is added during
operation.
5: The frequency inverter model
is of
1:Eliminate external
faults.
2: Perform the motor
auto-tuning.
3:Adjust The voltage to
normal range.
4: Remove the
addedload.
5: Select a frequency
Inverter of higher power
Overvoltage
during
acceleration
5
1:The input voltage is too high
2:The surge voltage is mixed in
the input power supply.
3: There is an external force to
drive the motor to run, or the
brake type load is too heavy
4:The acceleration time is too
short
5:The motor is shorted to ground
1:The power supply
voltage is reduced to the
normal range
2:Install DC reactor
3:Cancel the external
force of the draggable
motor or install the brake
unit
4: Increase the
acceleration time
5:Eliminate the part of the
ground short circuit
Overvoltage
during
deceleration
6
1:The input voltage is too high
2:The surge voltage is mixed in
the input power supply.
3: there is an external force to
drive the motor to run, or the
brake type load is too heavy
4:the decceleration time is too
short
5:the motor is shorted to ground
1:the power supply
voltage is reduced to the
normal range
2:install DC reactor
3:Cancel the external
force of the draggable
motor or install the brake
unit
4: increase the
decceleration time
5:eliminate the part of the
ground
Overvoltage
at constant
speed
7
1:The input voltage is too high
2:The surge voltage is mixed in
the input power supply.
3: There is an external force to
drive the motor to run, or the
brake type load is too heavy
4:The acceleration or
decceleration time is too short
5:The motor is shorted to ground
1:the power supply
voltage is reduced to the
normal range
2:install DC reactor
3:Cancel the external
force of the draggable
motor or install the brake
unit
4: increase the
acceleration or
decceleration time
Fault Name
Faul
t
cod
e
Disp
lay
Possible Causes
Solutions
Er.O
U1
Er.O
C3
Er.O
U3
Er.O
U2
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