Initial commissioning
4–14
1070 066 037-101 (00.02) GB
4.3
Optimizing the drive controller
As a rule, the drive performance is satisfactory when the parameter settings
described above have been made, i.e. it is not necessary to make more ad-
justments at the control unit.
If necessary, however, the position controller, the speed controller and the
filter can be modified within the servo system.
In order to visualize the effects of optimization on the control loop, a storage
oscilloscope and the OM4 option module with suitably parameterized mea-
suring outputs (cf. section 4.2.12, page 4–13) are absolutely necessary.
CAUTION
Any interventions in the parameters of the control units are reserved
to persons with profound knowledge of the individual control unit
parameters and experience in the optimization of servo loops!
The following block diagram is designed to give you an overview of the pa-
rameters of the servo loop:
–
–
P-component of speed controller
S-0-0100
Integral-action component of speed controller
S-0-0101
Speed limit value
S-0-0091
Acceleration limit value
S-0-0138
Actual speed
S-0-0040
Selection of filter type
P-0-0120
Limit frequency of low pass filter
P-0-0121
Quality of band rejection filter
P-0-0122
Center frequency of band rejection filter P-0-0123
Actual value smoothing interval P-0-0013
–
from encoder evaluation
Feed-for-
ward con-
trol (S32,
P500)
Loop gain factor
S-0-0104
Position setpoint
S-0-0047
Position actual value S-0-0051
Following distance
S-0-0189
Position setpoint
change P-0-2552
Cyclic instructions to the
drive, such as
– setpoint condition of
OUT1
– type of interface
– power ON/OFF
– brake ON/OFF
are contained in P-0-2550
in bit code (bits 0, 5, 6 and
7). The drive is enabled
through the CAN bus.
In P-0-2551, the drive re-
turns its status to the rho.
rho:
linear
interpolation
Speed setpoint
S-0-0036
Torque setpoint
S-0-0080
P-component
S-0-0106, S-0-0119
Integral-action component
S-0-0107, S-0-0120
Torque limit value
S-0-0092
Actual
speed
value
Position
actual
value
Speed
controller
Rejection
filter/low-
pass filter
Current
controller
PWM
output
Actual
current
value
Position
controller
The parameters of the current controller are critical for the drive behav-
ior. They must not be changed without having consulted Bosch.