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03/2006
Fig. 10-2
Guide frequency
The guide frequency response measurement determines the transmission
response
response of the speed controller. The response range should be as wide as
possible and without resonance. It may also be necessary to use stop or low-
pass filters (611D). Particular care must be taken to prevent resonance within
the speed controller limit frequency range (stability limit approx. 200-500 Hz).
Interference
Alternatively, the interference frequency response can be recorded to evaluate
frequency
the noise suppression of the controller.
response
Measuring
Amplitude
This parameter determines the test signal amplitude. This should give rise to
parameters for
only a very low speed of a few (approximately 1 to 2) revs/min at the motor end.
guide and
interference
Offset
frequency
The measurement requires a low speed offset of just a few motor revolutions
response
per minute. The set offset must be greater than the amplitude.
From SW 4.1:
S
S
S
S
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
Display diagram: Example of speed control loop
The offset is started up via an acceleration ramp.
The acceleration value is defined for an
Axis:
MD 32300: MAX_AX_ACCEL
Spindle:
MD 35200: GEAR_STEP_SPEEDCTRL_ACCEL
MD 35210: GEAR_STEP_POSCTRL_ACCEL
Where:
Acceleration value = 0, no ramp
Acceleration value > 0, ramp active
The actual measuring function is not activated until the offset value is
reached.
10 Drive Optimization
10.4 Frequency response measurement
10
10-185
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