SSD Parvex DIGIVEX Little Drive Servoamplifier User And Commissioning Manual page 70

DIGIVEX Little Drive Servoamplifier
There are three possibilities :
A response must be obtained without overshooting and oscillation. For example, increase gain
until oscillations gradually appear, then reduce it by 20 to 30%.
If the maximum value shown in the table is reached with P gain, without reducing the filtering
frequency, then:
Stop increasing P
Reduce the filtering frequency until the limit of oscillation
Filtering frequency setting
Oscillations may appear on the response obtained above (even when speed is increasing).
This gives frequency resonance (probably mechanical origin) fr = 1/T, greater than 100 Hz.
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Non oscillating response
Response with pseudo-oscillation
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PVD 3530 GB 01/2005