Filter
Top Products
88
Troubleshooting
ERRORS AND PROTECTIVE FUNCTIONS
6
6.4.5 Machine operates unstably
(1) Speed control
N
Y
Y
Y
N
N
Y
Y
N
N
Y
N
Y
Y
N
N
Y
N
The machine operates
unstably.
Is the acceleration/
deceleration time longer
than the setting?
Is the acceleration/
deceleration time extremely
short?
Is the speed control
gain too high.
(Vibration/hunting)
Does speed fluctuation
occur at low speed?
Is torque insufficient?
Is the load inertia large?
Increase the acceleration/
deceleration time.
Perform easy gain tuning.
Decrease the speed control
proportional gain (Pr. 820).
Increase the speed control
integral time (Pr. 821).
Is the carrier frequency
high?
Is the speed control
gain low?
Is torque insufficient?
Set the acceleration/
deceleration time that matches
the load inertia.
Decrease the carrier
frequency (Pr. 72).
Increase the speed control
proportional gain (Pr. 820).
Decrease the speed control
integral time (Pr. 821).
The possible cause is the
adverse effect of weak
excitation.
Increase the excitation ratio
(Pr. 854). <Refer to the
Instruction Manual (detailed).>
Increase the torque restriction
value, or increase the excitation
ratio (Pr. 854).
<Refer to the Instruction Manual
(detailed).>
Increase the motor and inverter
capacities.
Please contact your sales
representative.