Acceleration/Deceleration Is Not Smooth - Mitsubishi Electric FR-E700 Series Instruction Manual

Check first when you have troubles
7.6.7

Acceleration/deceleration is not smooth

Check Points
Parameter
setting
7 - 26
Possible Cause
Acceleration/deceleration time is too short.
Torque boost (Pr. 0, Pr. 46) setting is impro-
per under V/F control, so the stall prevention
function is activated.
The base frequency does not match the
motor characteristics.
Stall prevention function is activated due to a
heavy load.
Regeneration avoidance operation is perfor-
med
Countermeasures
Increase acceleration/deceleration time.
Increase/decrease Pr. 0 "Torque boost" set-
ting value by 0.5% increments to the setting.
For V/F control, set Pr. 3 "Base frequency" and
Pr. 47 "Second V/F (base frequency)".
For Advanced magnetic flux vector control or
General-purpose magnetic flux vector con-
trol, set Pr. 84 "Rated motor frequency".
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 ).)
Check the capacities of the inverter and the
motor.
If the frequency becomes unstable during
regeneration avoidance operation, decrease
the setting of Pr. 886 "Regeneration avoi-
dance voltage gain".
Troubleshooting
Refer to
Page
6-69
6-33
6-54
6-88
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6-42
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6-298