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Motor noise, EMI measures, mechanical resonance
4
PARAMETERS
4.15.2 Speed smoothing control (Pr. 653)
The above parameter can be set when Pr.160 Extended function display selection = "0". (Refer to page 162)
(1) Control block diagram
(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.
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
Name Initial Value Setting Range Description
653
Speed smoothing control
0 0 to 200%
Increase or decrease the value using
100% as reference to check an effect.
NOTE
Depending on the machine, vibration may not be reduced enough or an effect may not be produced.
V/F control
Torque current
Frequency output
Voltage output
+
-
Speed smoothing control
Pr.653
Acceleration/deceleration
processing
Output frequency
Speed
command