Lenze 8400 TopLine - Manual (Page 272)

5 Motor control (MCTRL)
5.10 Parameterisable additional functions
272
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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5.10.7 Oscillation damping
Mechanical oscillations are undesirable effects in every process and they may have an adverse effect
on the single system components and/or the production output.
Mechanical oscillations in the form of speed oscillations are suppressed by the oscillation damping
function.
Mechanical oscillations may occur:
• In the voltage range (output voltage is lower than max. voltage)
• Here, the oscillations occur in no-load operation.
• Here, speeds of 40 ... 80 % of the rated speed are typical.
• See subchapter "
Oscillation damping voltage range ". ( 273)
• In the field weakening range (output voltage has reached maximum voltage)
• Here, the oscillations occur in no-load operation and with load.
• Here, speeds higher than the rated speed are typical, especially when the output frequency is
close to the mains frequency.
• See subchapter " Oscillation damping in the field weakening range ". ( 274)

Note!
With servo control (SC), the Oscillation damping voltage range has no influence.
Mechanical natural frequencies can be suppressed or at least dampened in the speed
control loop of the servo control by means of a current setpoint filter.  Setting the
current setpoint filter (band-stop filter) ( 244)
Oscillation dampening, especially in the field weakening range, is also possible by
activating the current controller feedforward control ( C00079/1 ).