Mitsubishi Electric FR-D720S SC EC, Instruction Manual

Page: 461 / 512

Troubleshooting Check first when you have troubles
FR-D700 SC EC 7 - 25
7.6.7 Acceleration/deceleration is not smooth
Check points Possible Cause Countermeasures
Refer to
Page
Parameter
Setting
Acceleration/deceleration time is too
short.
Increase acceleration/deceleration time. 6-59
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
The base frequency does not match the
motor characteristics.
For V/f control, set Pr. 3 "Base frequency"
and Pr. 47 "Second V/f (base frequency)".
6-44
For general-purpose magnetic flux vector
control, set Pr. 84 "Rated motor fre-
quency".
6-74
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. (Setting
Pr. 22 too large may result in frequent
overcurrent trip (E.OC
).)
6-33
Check the capacities of the inverter and
the motor.
—
Regeneration avoidance operation is per-
formed
If the frequency becomes unstable during
regeneration avoidance operation,
decrease the setting of Pr. 886 "Regene-
ration avoidance voltage gain".
6-267