Lenze i550

Address Name / seng range / [default seng] Info
0x2B09:002
(P315.02)
Slip compensaon: Filter me
(Slip compens.: Filter me)
1 ... [100] ... 6000 ms
Filter me for the slip compensaon.
•
The preset lter me is adapted to typical motors.
0x2C02:004
(P351.04)
Slip frequency
(Slip frequency)
•
Read only: x.x Hz
Display of the rated slip determined.
10.4.6 Set oscillaon damping
The oscillaon damping serves to reduce the oscillaons during no-load operaon which are
caused by energy oscillang between the mechanical system (mass inera) and the electrical
system (DC bus). Furthermore, the oscillaon damping can also be used to compensate for
resonances.
The funcon is equally suitable for the closed loop V/f characterisc control.
Restricons
Observe the following restricons:
•
Damping is possible only for constant oscillaons at a steady-state operang point.
•
Oscillaons occurring sporadically cannot be damped.
•
Oscillaon damping is not suitable for oscillaons occurring during dynamic processes
(e.g. acceleraons or load changes).
•
Oscillaon damping is only acve if the setpoint speed is greater than 10 rpm and the DC-
bus voltage exceeds a value of 100 V.
Details
The determinaon of the oscillaon is based on the acve current. In order to obtain the
alternang component of the acve current, this current is dierenated. This signal is then
passed through a PT1 lter.
Idencaon of the oscillaon
Before the oscillaon damping funcon can be parameterised, the oscillaon has to be iden-
ed. One way to do this is to examine the motor current while oscillaon damping is switched
o (gain = 0 %). At steady-state operaon, a constant current ows. If the drive oscillates,
these oscillaons are also visible on the motor current. It is therefore possible to determine
the frequency and the amplitude of the oscillaon from the alternang component of the
motor current. In the following, this alternang component is referred to as "current oscilla-
on".
Parameter seng
Set the gain of the oscillaon signal according to the following equaon:
0x2B0A:001 (P318.01) = current amplitude * 100 % / (Ö
2
* maximum device current)
The default me constant of the PT1 lter is sucient for most applicaons. If required, it is
only possible to adapt the me constant via »EASY Starter«. Generally, the me constant must
be set so that the oscillaon is dampened and higher-frequency components are ltered from
the signal. The me constant is given by the reciprocal value of double the current oscillaon
frequency:
0x2B0A:002 (P318.02) = 1 / (2 * oscillaon frequency)
Parameter
Address Name / seng range / [default seng] Info
0x2B0A:001
(P318.01)
Gain
(Gain)
-400 ... [150] ... 400 %
Gain of the oscillaon signal.
•
With the seng 0, oscillaon damping is deacvated.
0x2B0A:002
(P318.02)
Filter me
(Filter me)
1 ... [30] ... 600 ms
Time constant of the PT1 lter.
Conguring the motor control
V/f characterisc control for asynchronous motor (VFC open loop)
Set oscillaon damping
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