Motor current is too large
Check points Possible Cause
Torque boost (Pr. 0, Pr. 46) setting is
improper under V/f control, so the stall
prevention function is activated.
V/f pattern is improper when V/f control is
performed. (Pr. 3, Pr. 14, Pr. 19)
Stall prevention function is activated due
to a heavy load.
Auto tuning is not performed under
Advanced magnetic flux vector control or
General-purpose magnetic flux vector
Check first when you have troubles
Increase/decrease Pr. 0 "Torque boost"
setting value by 0.5% increments to the
Set rated frequency of the motor to Pr. 3
"Base frequency". Use Pr. 19 "Base fre-
quency voltage" to set the base voltage
(e.g. rated motor voltage).
Change Pr. 14 "Load pattern selection"
according to the load characteristic.
Reduce the load weight.
Set Pr. 22 "Stall prevention operation
level" higher according to the load. (Set-
ting Pr. 22 too large may result in frequent
overcurrent trip (E.OC ).)
Check the capacities of the inverter and
Perform offline auto tuning.
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