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6. TROUBLESHOOTING
6-2
Table 6-1
Parameter
Unit Display
Protective
Function Name
Detection Level
Possible Cause (
)
and
Corrective Action (•)
Acceleration-time
overcurrent
Output current is
more than 200%
of motor rating.
The acceleration torque is beyond the drive unit
capability.
•
Increase the acceleration time.
Outputs U, V and W are in a short circuit or ground
fault.
•
Check the motor winding resistance.
•
Check the connection cables for damage.
The motor restarted during coasting.
•
Restart it after a complete stop.
Constant speed-
time overcurrent
Output current is
more than 200%
of motor rating.
Excessive load was applied instantaneously.
Outputs U, V and W resulted in a short circuit or
ground fault during constant-speed operation.
•
Check the motor winding resistance.
•
Check the connection cables for damage.
Deceleration-time
overcurrent
Output current is
more than 200%
of motor rating.
The deceleration torque is beyond the drive unit
capability.
•
Increase the deceleration time.
Outputs U, V and W resulted in a short circuit or
ground fault during deceleration operation.
•
Check the motor winding resistance.
•
Check the connection cables for damage.
The mechanical brake of the motor operates too
early.
•
Delay the operation timing.
Acceleration-time
overvoltage
Main circuit DC
voltage is more
than 400V.
Surge compounded with power during acceleration
operation.
•
Install a reactor.
•
Fit a sur
g
e suppressor or like to the sur
g
e source.
The regenerative energy handling capability is
insufficient.
•
Fit the regenerative brake option.
Constant speed-
time overvolta
g
e
Main circuit DC
voltage is more
than 400V.
Surge compounded with power during acceleration
operation.
•
Install a reactor.
•
Fit a sur
g
e suppressor or like to the sur
g
e source.
Load increased suddenly, activating the stall
prevention function.
The regenerative energy handling capability is
insufficient.
•
Fit the regenerative brake option.
Deceleration-time
overvoltage
Main circuit DC
voltage is more
than 400V.
The deceleration torque is beyond the drive unit
capability.
•
Increase the deceleration time.
The regenerative energy handling capability is
insufficient.
•
Fit the regenerative brake option.
Surge compounded with power during deceleration
operation or stop.
•
Install a reactor.
•
Fit a surge suppressor or like to the surge source.