Siemens SINUMERIK 840Di Manual page 333

06.03
Definition of the
K factor
V
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
The servo gain factor is defined as the ratio of velocity in m/min and the
resulting following error in mm
Velocity
K =
V
Following error
i.e. with a Kv factor of 1 and a velocity of 1 m/min, the following error will be
1 mm.
S
MD32200: POSCTRL_GAIN[n] (loop gain)
is used to specify the Kv factor of the machine axis.
Note
To adapt the input/output unit of the Kv factor selected by default to the internal
unit [1/sec], the following machine data are assigned by default:
S
MD 10230: SCALING_FACTORS_USER_DEF[9] = 16.666667
S
MD 10220: SCALING_USER_DEF_MASK = 'H200'; (bit no. 9 as a hex-
adecimal value)
When entering the servo gain factor, take into account that the amplification
factor of the entire position control loop is also dependent on other parameters
of the controlled system.
These factors are:
S
MD32260: RATED_VELO
S
MD32250: RATED_OUTVAL
S
Tacho adjustment on the speed controller
S
Tacho generator on drive.
Notice
Machine axis that interpolate one with another must have the same following
error at the same velocities.
This can be achieved by setting the same K
adaptation in:
S
MD32900: DYN_MATCH_ENABLE
S
MD32910: DYN_MATCH_TIME.
The real servo gain factor can be checked with the following error in the service
display.
S
e.g. HMI Advanced: Operating area "DIAGNOSIS" > Service displays >
Service axis.
10 NC Start-Up with HMI Advanced
10.5 Axes and spindles
[m/min]
[mm]
factor or dynamic response
V
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