250
Check first when you have a trouble
5.5.2 Motor or machine is making abnormal acoustic noise
Parameter
Setting
Pr. 78 Reverse rotation prevention selection is set.
Check the Pr. 78 setting.
Set Pr. 78 when you want to limit the motor rotation to
only one direction.
144
Pr. 79 Operation mode selection setting is wrong.
Select the operation mode which corresponds with input
methods of start command and speed command.
149
Bias and gain (calibration parameter C2 to C7) settings
are improper.
Check the bias and gain (calibration parameter C2 to C7)
settings.
135
Pr. 13 Starting speed setting is greater than the running
speed.
Set running speed higher than Pr. 13.
The drive unit does not start if the speed setting signal is
less than the value set in Pr. 13.
89
Speed settings of various running speed (such as multi-
speed operation) are zero.
Especially, Pr. 1Maximum setting is zero.
Set the speed command according to the application.
Set Pr. 1 higher than the actual speed used.
78
Pr. 15 Jog speed setting setting is lower than Pr. 13Starting
speed.
Set Pr. 15 Jog speed setting higher than Pr. 13 Starting
speed
82
Operation mode and a writing device do not match.
Check Pr. 79, Pr. 338, Pr. 339, Pr. 551, and select an
operation mode suitable for the purpose.
147,
160
Start signal operation selection is set by the Pr. 250 Stop
selection
Check Pr. 250 setting and connection of STF and STR
signals.
104
PM motor test operation is selected. Set "30" in Pr. 800 Regenerative function selection. 69
Load
Load is too heavy. Reduce the load. —
Shaft is locked. Inspect the machine (motor). —
Others
Operation panel display shows an error (e.g. E.OC1).
When any fault occurs, take an appropriate corrective
action, then reset the drive unit, and resume the
operation.
237
Check
points
Possible Cause Countermeasures
Refer
to
page
Input
signal
Disturbance due to EMI when speed command is given
from analog input (terminal 2, 4).
Take countermeasures against EMI. 36
Parameter
Setting
Increase the Pr. 74 Input filter time constant if steady
operation cannot be performed due to EMI.
134
Parameter
Setting
Resonance occurs. (Rotation speed)
Set Pr. 31 to Pr. 36 (speed jump).
When it is desired to avoid resonance attributable to the
natural speed of a mechanical system, these
parameters allow resonant speeds to be jumped.
79
Gain adjustment during PID control is insufficient.
To stabilize the measured value, change the proportional
band (Pr. 129) to a larger value, the integral time (Pr. 130)
to a slightly longer time, and the differential time (Pr. 134)
to a slightly shorter time.
Check the calibration of set point and measured value.
199
Speed control gain is too high. Check Pr. 820 Speed control P gain setting. 71
Others
Mechanical looseness
Adjust machine/equipment so that there is no
mechanical looseness.
—
Motor
Operating with output phase loss Check the motor wiring. —
Please contact your sales representative.
Check
points
Possible Cause Countermeasures
Refer
to
page
