Motor Generates Heat Abnormally; Motor Rotates In The Opposite Direction; Speed Greatly Differs From The Setting - Mitsubishi Electric FR-E700EX Instruction Manual

Check first when you have a trouble
5.5.3

Motor generates heat abnormally

Check
Points
The required space is not provided around the motor.
Motor
The mounting flange is small.
Main
The drive unit output voltage (U, V, W) are unbalanced.
Circuit

Motor current is large.
5.5.4

Motor rotates in the opposite direction

Check
Points
Phase sequence of output terminals U, V and W is
Main
incorrect.
Circuit The rotation direction of the output shaft is changed by
the reduction gear.
The start signals (forward rotation, reverse rotation) are
connected improperly.
Input
Adjustment by the rotation speed is improper during the
Signal
reversible operation with Pr.73 Analog input selection
setting.
Pr.40 RUN key rotation direction selection setting is
incorrect.
Parameter
Under position control, the sign of the position
Setting command is incorrect.
Under position control, the Pr.463 Position control rotation
direction selection setting is incorrect.
5.5.5

Speed greatly differs from the setting

Check
Points
Speed setting signal is incorrectly input.
Input
Signal The input signal lines are affected by external EMI.
Pr.1, Pr.2, calibration parameter C2 to C7 settings are
improper.
Parameter
Setting Pr.31 to Pr.36 (speed jump) settings are improper.
Under position control, the maximum speed setting is
incorrect in Pr.4 to Pr.6, and Pr.24 to Pr.27.
Load
Parameter
Torque limit function is activated due to a heavy load.
Setting
Motor
282
Possible Cause
Possible Cause
Possible Cause
Countermeasures
Improve the environment around the motor.
Use a bigger flange.
Check the output voltage of the drive unit.
Check the insulation of the motor.
Refer to "5.5.10 Motor current is too large"
Countermeasures
Connect phase sequence of the output cables (terminal
U, V, W) to the motor correctly
Check the rotation direction of the motor's output shaft.
Check the wiring. (STF: forward rotation, STR: reverse
rotation)
Check the setting of Pr.125, Pr.126, C2 to C7.
Check the Pr.40 setting.
Check the sign setting of positioning sub-function in
Pr.525 to Pr.531.
Check the Pr.463 setting.
Countermeasures
Measure the input signal level.
Take countermeasures against EMI such as using
shielded wires for input signal lines.
Check the settings of Pr.1 Maximum setting, Pr.2 Minimum
setting.
Check the calibration parameter C2 to C7 settings.
Narrow down the range of speed jump.
Check the maximum speed setting in Pr.4 to Pr.6, and
Pr.24 to Pr.27.
Reduce the load weight.
Set Pr.22 Torque limit level higher according to the load.
(Setting Pr.22 too large may result in frequent
overcurrent trip (E.OC).)
Check the capacities of the drive unit and the motor.
Refer
to
page


289
284
Refer
to
page
15
15
18
173
255
95
92
Refer
to
page

36
115
173
116
95

111
