Operation Panel (Fr-Du07) Display Is Not Operating; Motor Current Is Too Large - Mitsubishi Electric FR-F740 EC Instruction Manual

Troubleshooting
7.6.10

Operation panel (FR-DU07) display is not operating

Check points Possible cause
Main Circuit,
Control Circuit
Front cover
7.6.11

Motor current is too large

Check points Possible cause
Parameter
Setting
FR-F700 EC
No power input.
Operation panel is not properly connected
to the inverter.
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.
(Pr. 3, Pr. 14, Pr. 19)
Stall prevention function is activated due
to a heavy load.
Check first when you have troubles
Countermeasures
Input the power.
Check if the inverter front cover is installed
securely.
The inverter cover may not fit properly
when using wires whose size are 1.25mm
or larger, or when using many wires, and
this could cause a contact fault of the
operation panel.
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.
(V/f control)
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.
Refer to
page
3-5
2
2-2
Refer to
page
6-39
6-58
6-60
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6-44
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