Motor Current Is Too Large - Mitsubishi Electric FR-D720S SC EC Instruction Manual

Check first when you have troubles
7.6.11

Motor current is too large

Check points Possible Cause
Parameter
Setting
7 - 28
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
General-purpose magnetic flux vector
control.
Countermeasures
Increase/decrease Pr. 0 "Torque boost"
setting value by 0.5% increments to the
setting.
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
the motor.
Perform offline auto tuning.
Troubleshooting
Refer to
Page
6-26
6-44
6-46
—
6-33
—
6-74