Speed Control Loop Measurement - Siemens SINUMERIK 840D sl Commissioning Manual

Drive tuning
10.5 Measuring functions (manual tuning)
3. Press the "Meas. parameters >" softkey to adapt the parameters for a measurement.
Measurement parameters:
– Amplitude: Magnitude of the test signal amplitude.
– Bandwidth: The frequency range analyzed with the measurement.
4. To start the measurement, press softkey "Measure >" followed by softkey "Start meas.".
Two measurements are performed and the result is then displayed:
10.5.2

Speed control loop measurement

Function
The response characteristics for the motor measurement system are analyzed when
measuring the speed control loop. Various measurement parameter lists are available
depending on the basic measurement setting which has been selected.
The predefined processes for the speed control loop are listed below. As in the current
controller range, the excitation and measurement signals in the speed controller range refer to
the SINAMICS S120 drive. The speed controller measurements differ in terms of the excitation,
which can either be a disturbing torque, a speed setpoint before the filter or a speed setpoint
after the filter. This is comparable with parameter p0480 for values 2, 3 or 5.
A distinction is made in the table between the input node and the excitation point. The input
node only determines which signal is considered as the input for the subordinate system to be
measured.
320
Given in percent of the peak torque. Values from 1 % to 5 % are suitable.
The bandwidth depends on the current controller sampling time.
Example: Sample time: 125 μs, bandwidth: 4000 Hz
CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA