Motor Or Machine Is Making Abnormal Acoustic Noise - Mitsubishi Electric FR-E700EX Instruction Manual

Check
Points
Under position control, the forward rotation stroke end
Input
(LSP) or the reverse rotation stroke end (LSN) signal is
Signal
assigned, but is not input.
Pr.78 Reverse rotation prevention selection is set.
Parameter
Pr.79 Operation mode selection setting is wrong.
Setting
Bias and gain (calibration parameter C2 to C7) settings
are improper.
Pr.13 Starting speed setting is greater than the running
speed.
Speed settings of various running speed (such as
multispeed operation) are zero.
Parameter
Especially, Pr.1 Maximum setting is zero.
Setting Pr.15 Jog speed setting is lower than Pr.13 Starting speed.
Operation mode and a writing device do not match.
Start signal operation selection is set by the Pr.250 Stop
selection.
PM motor test operation is selected.
Load is too heavy.
Load
Shaft is locked.
Operation panel display shows an error (e.g. E.OC1).
Others
Under position control, point table position control
based on the absolute position does not operate.
5.5.2

Motor or machine is making abnormal acoustic noise

Check
Points
Input
Signal
Disturbance due to EMI when speed command is given
Parameter from analog input (terminal 2, 4).
Setting
Resonance occurs. (rotation speed)
Parameter
Setting
Gain adjustment during PID control is insufficient.
Speed control gain is too high.
Under position control, position control gain is too high.
Others Mechanical looseness
Operating with output phase loss
High-frequency tone is heard while the motor is at a
Motor
stop.
Please contact your sales representative.
Possible Cause
Possible Cause
Check first when you have a trouble
Countermeasures
Turn ON the LSP or LSN signal.
Check the Pr.535 Position control terminal input selection
setting.
Check the Pr.78 setting.
Set Pr.78 when you want to limit the motor rotation to
only one direction.
Select the operation mode which corresponds with input
methods of start command and speed command.
Check the bias and gain (calibration parameter C2 to C7)
settings.
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.
Set the speed command according to the application.
Set Pr.1 higher than the actual speed used.
Set Pr.15 Jog speed setting higher than Pr.13 Starting speed.
Check Pr.79, Pr.338, Pr.339, Pr.551, and select an
operation mode suitable for the purpose.
Check Pr.250 setting and connection of STF and STR
signals.
Set "10" in Pr.800 Control method selection.
Reduce the load.
Inspect the machine (motor).
When any fault occurs, take an appropriate corrective
action, then reset the drive unit, and resume the
operation.
Perform home position return.
Countermeasures
Take countermeasures against EMI.
Increase the Pr.74 Input filter time constant if steady
operation cannot be performed due to EMI.
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.
Set Pr.862, Pr.863, and Pr.871 (notch filter).
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.
Check Pr.820 Speed control P gain setting.
Check the Pr.422 Position control gain setting.
Adjust machine/equipment so that there is no
mechanical looseness.
Check the motor wiring.
High-frequency tone may be generated during the MM-
GKR motor driving operation because high frequency
currents are superposed during low-speed operation
and stopping. This is a normal operation.
Refer
to
page
100
182
188
173
128
115
119
186,
195
142
75


267
95, 104
Refer
to
page
36
172
85, 116
5
235
80
92



281