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10 Drive Optimization
10.4 Frequency response measurement
Setpoint and inter-
ference variable
step change
Measuring
parameters for
setpoint and
interference
variable step
changes
10-186
Bandwidth
Analyzed frequency range
S
4.0 kHz for 840D (scanning frequency 8.0 kHz).
Averaging
This value increases both the accuracy of the measurement and the measuring
duration. A value of 20 is normally suitable.
Settling time
Recording of the measured data starts after a delay equal to the value set here
after activation of the test setpoint. A value of between 0.2 and 1 s is recom-
mended.
Initiation of the step change can be used to assess the transient response
(response to setpoint changes or response to interference) of the speed control-
ler within the time range. The test signal is connected to the speed controller
output for recording of the response to interference.
Amplitude
This parameter determines the magnitude of the set setpoint or interference
step change
Measuring time
This parameter determines the recorded period (up to 2048 x speed controller
cycles).
Offset
A small offset of a few motor revolutions per minute may be set to eliminate the
influence of adhesive friction.
S
The offset is started up via an acceleration ramp.
S
The acceleration value is defined for an axis/spindle:
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
S
The actual measuring function is not activated until the offset value is
reached.
Settling time
Recording of the measured data and outputting of the test setpoint start after a
delay equal to this value after the offset is activated.
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
© Siemens AG 2006 All Rights Reserved
03/2006
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