ID
Index Name
Unit Description
372
0
CON_IP_SFFTF
ms
Speed feedforward filter time constant (PCON
mode)
374
0
CON_IP_EpsDly
ms
Delay pos. reference by integer no. of cycles
CON_PConTS
375
0
CON_IP_SFFScale
%
Scaling of speed feedforward
376
CON_IP_TFFScale
Scaling of torque feedforward
376
0
TFFScale_PCON
Scaling of torque feedforward (PCON mode)
376
1
TFFScale_SCON
Scaling of torque feedforward (SCON mode)
377
CON_IP_EnableFF
Enable feedforward
377
0
CON_IP_EnableFF
Enable feedforward
377
1
CON_IP_EnableFF
Enable feedforward
378
0
CON_IP_ACCFFTF
ms
Acceleration feedforward filter time constant
(PCON, SCON mode)
379
CON_IP_FFMode
Feed-forward calculation mode
379
0
PosHighRes
Position high resolution
379
1
Speed
Speed pre-control
379
2
Torque
Torque pre-control
386
CON_SCON_TFric
Dry friction comp., normalized to motor rated
torque
386
0
CON_SCON_TFric
%
Friction torque compensation settings
The table values 0 to 2 are always applicable
while table values 3 to 4 only take effect in the
acceleration range.
386
1
CON_SCON_TFric
%
Compensation value 1
386
2
CON_SCON_TFric
%
Compensation value 2
386
3
CON_SCON_TFric
%
Compensation value 3
386
4
CON_SCON_TFric
%
Compensation value 4
387
CON_SCON_TFricSpeed
Friction torque compensation: Speed limits
387
0
CON_SCON_TFricSpeed rpm
Friction torque compensation: Speed limits
387
1
CON_SCON_TFricSpeed rpm
Friction torque compensation: Speed limit 1
387
2
CON_SCON_TFricSpeed rpm
Friction torque compensation: Speed limit 2
387
3
CON_SCON_TFricSpeed rpm
Friction torque compensation: Speed limit 3
387
4
CON_SCON_TFricSpeed rpm
388
0
CON_SCON_TConst
%
Friction torque compensation: Constant
(independent of direction)
1516
0
SCD_Jsum
kg
m*m
Total inertia of motor and plant
Table 7.21: “Position controller - Pre-control” parameters
ID No.: 0842.26B.5-01 Date: 09.2020
ServoOne - Device Help
143
7 Control
NOTE
l
Torque feed-forward control will be disabled if linear interpolation
is used.
l
The overall moment of inertia in
P 1516[0] - SCD_Jsum
must not
be changed to optimize the pre-control, because this would also
have an effect on other controller settings!
l
In multi-axis applications requiring precise three-dimensional axis
coordination, such as in the case of machine tools, the delay of
the position signal must be equally set on all axes via
P 374[0] -
IP_EpsDly
. Otherwise the synchronization of the axes may suffer,
leading to three-dimensional path errors.
7.5.2 Friction torque compensation (friction)
Two types of friction influence the variables of the position tracking error:
l
Dry friction (grip), which acts depending on the direction of motion, but
independently of the speed’s magnitude.
l
Fluid friction (viscosity), which acts proportionally to speed.
Friction torque compensation can be used for both types of friction. Both types of
friction are described in the compensation table by a function starting from speed = 0
or force = 0 up to a defined speed or force. Above the specified limit, the speed or
force remains constant. Compensation is performed as a percentage of rated motor
torque and power.