Continental Hydraulics Installation Manual
Page 18 of 27
CEM-SA-B
CHI 1020687 01/2016
V0:A / V0:B (Loop gain setting)
Command
Parameters
Unit
Group
V0:i x
i= A|B
x= 1… 400
s
-1
VMODE = NC
This parameter is specified in s
-1
(1/s).
In NC Mode normally the loop gain is specified rather than the deceleration stroke
5
.
The internal gain is calculated from this gain value together with the parameters VMAX and
SYS_RANGE.
i
Intern
i
D
STROKE
G
V
v
D
0
max
Calculation of the internal control gain
In NC Mode the following error at maximum speed is calculated by means of the loop gain. This
following error corresponds to the deceleration stroke with stroke-dependent deceleration. The
conversion and therefore also the correct data demands related to the closed loop control system
are relatively simple if the relationship described here is taken into account.
V0:RES (Scaling of the loop gain)
Command
Parameters
Unit
Group
V0:RES
x
x= 1|100
-
VMODE = NC
V0:RES = 1
loop gain in s
-1
(1/s) units.
V0:RES = 100 loop gain in 0.01 s
-1
units
6
.
The increased resolution should be used in case of V0 < 4.
PT1 (Timing of the controller)
Command
Parameter
Unit
Group
PT1
x
x= 0… 300
ms
EXP
This parameter can be used to change the internal timing of the control function.
Hydraulic drives are often critical to control especially in case of high speeds and very fast valves.
The PT1 filter can be used to improve the damping rate and allows therefore higher loop gains.
Requirements for the use are: The natural frequency of the valve should be equal or higher than
the natural frequency of the drive.
5
The loop gain is alternatively defined as a KV factor with the unit (m/min)/mm or as V
0
in 1/s. The
conversion is
KV = V
0
/16,67.
6
In case of very low loop gains (1 s
-1
to 3 s
-1
) the better resolution of the adjustment should be selected.
