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Motor noise, EMI measures, mechanical resonance
4.16.2 Speed smoothing control (Pr. 653)
Vibration due to mechanical resonance influences the inverter control, causing the output current (torque) unstable. In this
case, the output current (torque) fluctuation can be reduced to ease vibration by changing the output frequency.
Parameter
Number
653
Speed smoothing control
The above parameter can be set when Pr.160 Extended function display selection = "0". (Refer to page 197)
(1)
Control block diagram
Acceleration/deceleration
processing
Speed
command
(2)
Setting method
If vibration due to mechanical resonance occurs, set 100% in Pr. 653, run the inverter at the frequency which generates
maximum vibration and check if the vibration will be reduced or not after several seconds.
If effect is not produced, gradually increase the Pr. 653 setting and check the effect repeatedly until the most effective
value is set in Pr. 653.
If vibration becomes large by increasing the Pr. 653 setting, gradually decrease the Pr. 653 setting than 100% to check the
effect in a similar manner.
NOTE
Depending on the machine, vibration may not be reduced enough or an effect may not be produced.
182
Name
Initial Value
Output frequency
+
-
Speed smoothing control
Pr. 653
GP
GP
GP
V/F
V/F
V/F
MFVC
MFVC
MFVC
<V/F><GP MFVC>
Setting Range
0
0 to 200%
V/F control
Description
Increase or decrease the value using
100% as reference to check an effect.
Frequency output
Voltage output
Torque current

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   Also See for Mitsubishi Electric FR-F700PJ

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