Motor Rotates In Opposite Direction; Acceleration/Deceleration Is Not Smooth - Mitsubishi Electric FR-E700 Instruction Manual

Check first when you have troubles
7.6.5

Motor rotates in opposite direction

Check Points
Main circuit
Input signal
Parameter
setting
7.6.6 Speed greatly differs from the setting
Check Points
Input signal
Parameter
setting
Load
Parameter
setting
Motor
7.6.7

Acceleration/deceleration is not smooth

Check Points
Parameter
setting
7 - 26
Possible Cause
Phase sequence of output terminals U, V and
W is incorrect.
The start signals (forward rotation, reverse
rotation) are connected improperly.
Adjustment by the output frequency is
improper during the reversible operation
with Pr. 73 "Analog input selection" setting.
Pr. 40 "RUN key rotation direction selection"
setting is incorrect.
Possible Cause
Frequency setting signal is incorrectly input.
The input signal lines are affected by external
EMI.
Pr. 1, Pr. 2, Pr. 18, calibration parameter C2 to
C7 settings are improper.
Pr. 31 to Pr. 36 "Frequency jump" settings are
improper.
Stall prevention is activated due to a heavy
load.
Possible Cause
Acceleration/deceleration time is too short.
Torque boost (Pr. 0, Pr. 46) setting is improper
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 per-
formed
Countermeasures
Connect phase sequence of the output
cables (terminal U, V, W) to the motor cor-
rectly
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.
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 fre-
quency", Pr. 2 "Minimum frequency", Pr. 18
"High speed maximum frequency".
Check the calibration parameter C2 to C7 set-
tings.
Narrow down the range of frequency jump.
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.
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 avoid-
ance voltage gain".
Troubleshooting
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