Active Vibration Suppression (Apc Without Sensor On The Load Side) - Siemens SINAMICS S120 Function Manual

Function modules
9.14 Advanced Position Control (including Active Vibration Suppression)
Parameter Default value
p3700.1 Using an external accelera‐
tion sensor
p3700.3 (option‐ Taking into account the set‐
al) point acceleration of the axis
After preassigning the parameters, carry out a RAM to ROM data backup.
Note
Using p3749
● When interconnecting a speed actual value from another axis, we recommend that the
"Speed information available" bit (r1992.11) is evaluated (e.g. interconnect to an external
fault p2106 ... p2108).
● To avoid an additional dead time as a result of the calculation sequence, we recommend
that the drive object of signal source of p3749 is set with a higher priority (p7900). The higher
priority applies with respect to the drive currently being processed.
9.14.2

Active Vibration Suppression (APC without sensor on the load side)

Function description
The "Active Vibration Suppression" (AVS) function is a rugged technique to dampen
mechanical oscillations - and a direct measuring system is not required. With this technique
only the current and speed actual values signals measured at the motor are used. The AVS
function is especially suitable for drives involving linear and torque motors, as these are
frequently configured without a direct measuring system.
The function can only be used if, at the axis where the oscillation occurs, the oscillation can be
measured in the motor current.
Before optimizing the AVS function, the speed control loop (= subordinate control loop) must be
optimized.
Note
AVS can also be used in conjunction with a direct measuring system. The combination of AVS
and direct measuring system offers, regarding the ruggedness of the technique (e.g. for
changes to the mechanical system) advantages when compared to a configuration where only
a direct measuring system is used.
If a direct measuring system is available, the closed-loop control (without sensor) can also be
combined with the P component (p3760/p3765) of the direct measuring system. This measure
allows disturbance suppression and precision to be increased.
556
Explanation
An external acceleration sensor must first be integrated into the system
(e.g. using a TM31 module). The function is activated in the APC using
p3700.1 = 1. The acceleration sensor signal must be wired to BICO sink
p3750. For this purpose, a highpass filter to filter low frequencies can be
set in p3751.
For applications where a high contour precision is required (in the mold
making area) we recommend that p3700.3 is set = 1. This means that the
actual setpoint acceleration of the axis is taken into account in the APC
calculation.
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Drive functions