Siemens Sinumerik 840DiE sl - Page 436

01/2007
14.4 Frequency response measurements
14-436
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
S Offset
To exclude the influence of static friction, an offset of a few motor revolutions
per minute is sufficient.
– The offset is run up via an acceleration ramp.
– The acceleration value is defined for one
Axis: MD 32300: MAX_AX_ACCEL
Spindle: 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 becomes active only when the offset
value is reached.
S Settling time
This value represents the delay between measured data recording/setpoint
output and the injection of the offset.
Speed setpoint
Offset
Settling time Measurement time
Time
Time
0
0
Position
characteristic
Amplitude
Fig. 14-3 Setpoint course for speed control loop/step response measuring function
14 Drive O
p
timization with HMI Advanced