Mitsubishi Electric FR-D720S SC EC, Instruction Manual

Page: 464 / 512

Check first when you have troubles Troubleshooting
7 - 28
7.6.11 Motor current is too large
Check points Possible Cause Countermeasures
Refer to
Page
Parameter
Setting
Torque boost (Pr. 0, Pr. 46) 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.
6-26
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 fre-
quency voltage" to set the base voltage
(e.g. rated motor voltage).
6-44
Change Pr. 14 "Load pattern selection"
according to the load characteristic.
6-46
Stall prevention function is activated due
to a heavy load.
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
).)
6-33
Check the capacities of the inverter and
the motor.
—
Auto tuning is not performed under
General-purpose magnetic flux vector
control.
Perform offline auto tuning. 6-74