Siemens SINUMERIK FM-NC Installation And Startup Manual page 213

05.97
03.96
Fig. 10-2
Reference
The frequency response measurement calculates the response of the speed
frequency controller. The response range should be as wide as possible and without reso-
nance. It may be necessary to install stop or low-pass (611D) filters. Particular
response
care must be taken to prevent resonance within the speed controller limit fre-
quency range (stability limit approx. 200–500Hz).
Interference
Alternatively, the interference frequency response can be recorded in order to
frequency assess how well the control suppresses interference.
response
Measurement
Amplitude
This parameter determines the magnitude of the test signal amplitude. This
parameters for
should give rise to only a very low speed of a few (approximately 1 to 2) revs/
reference and
min at the motor end.
interference
frequency
Offset
response
The measurement requires a slight speed offset of a few motor revolutions per
minute. The offset must be set to a higher value than the amplitude.
SW 4.1 and higher:
S
S
S
S
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SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
Display diagram: Example of speed control loop
The Offset is run up via an acceleration ramp.
The acceleration value is defined for one
axis: check MD 32300: MAX_AX_ACCEL
spindle: check MD 35200: GEAR_STEP_SPEEDCTRL_ACCEL
MD 35210: GEAR_STEP_POSCTRL_ACCEL
The following applies:
Acceleration value = 0, no ramp
Acceleration value > 0, ramp active
The actual measuring function is only activated when the offset value is
reached.
10 Drive Optimization with Start-Up Tool
10.5 Frequency response measurement
10
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