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Check first when you have a trouble
5.6.7 Acceleration/deceleration is not smooth
5.6.8 Motor current is too large
Check
points
Possible Cause Countermeasures
Refer
to
page
Parameter
Setting
Acceleration/deceleration time is too short. Increase acceleration/deceleration time. 61
Torque boost (Pr. 0, Pr. 46, Pr. 112) setting is improper
under V/F control, so the stall prevention function is
activated.
Increase/decrease Pr. 0 Torque boost setting value by
0.5% increments to the setting.
59
The base frequency setting and the motor
characteristic does not match.
For V/F control, set Pr. 3 Base frequency, Pr. 47 Second
V/F (base frequency), and Pr.113 Third V/F (base
frequency).
103
For vector control, set Pr.84 Rated motor frequency. 71
Regeneration avoidance operation is performed
If the frequency becomes unstable during
regeneration avoidance operation, decrease the
setting of Pr. 886 Regeneration avoidance voltage gain.
138
Load
Stall prevention (torque limit) function is activated
due to a heavy load.
Reduce the load weight. —
Parameter
Setting
Set Pr. 22 Stall prevention operation level (Torque limit
level) higher according to the load. (Setting Pr. 22 too
large may result in frequent overcurrent trip
(E.OC).)
106
(107)
Motor
Check the capacities of the inverter and the motor. —
Check
points
Possible Cause Countermeasures
Refer
to
page
Parameter
Setting
Torque boost (Pr. 0, Pr. 46, Pr. 112) setting is improper
under V/F control, so the stall prevention function is
activated.
Increase/decrease Pr. 0 Torque boost setting value by
0.5% increments to the setting.
59
V/F pattern is improper when V/F control is
performed. (Pr. 3, Pr. 14, Pr. 19)
Set rated frequency of the motor to Pr. 3 Base
frequency. Use Pr. 19 Base frequency voltage to set the
base voltage (e.g. rated motor voltage).
103
Change Pr. 14 Load pattern selection according to the
load characteristic.
105
Stall prevention (torque limit) function is activated
due to a heavy load.
Reduce the load weight. —
Set Pr. 22 Stall prevention operation level (Torque limit
level) higher according to the load. (Setting Pr. 22 too
large may result in frequent overcurrent trip
(E.OC).)
106
(107)
Check the capacities of the inverter and the motor. —
Auto tuning is not performed under Advanced
magnetic flux vector control, Real sensorless vector
control, or vector control.
Perform offline auto tuning. 71