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Commissioning
3
Commissioning
Prior to commissioning the control loop,
check all devices to make sure they are con-
nected correctly, do not leak and function
properly.
Release lock (4) and open out the indicating
unit (5) to enable easy access to the operat-
ing controls at the controller.
Check the turnboard to make sure the cor-
rect operating action is set at the controller
(see section 2.1.1).
3.1
Tuning the controller
The controller needs to be tuned to the char-
acteristics of the controlled system using the
K
and T
and/or T
P
n
ler module to ensure that the controller can
keep any system deviations for all set points
caused by the disturbance variables to zero
or at least to minimize them.
In case of controller stations which have a
manual/ automatic switch (1.6), the plant
must be started up manually.
We recommend to determine the settings by
using a tuning test (following the Ziegler and
Nichols method) which produces sufficient
results in most cases:
1. Apply supply air (1.4 ±0.1 bar).
2. Set the proportional-action coefficient K
to a low value at the comparator.
3. Set T
restrictor to its maximum value
n
and T
to its lowest value (applies only to
v
PI and PID controllers).
8
EB 7030 EN
adjusters at the control-
v
1.8
1.6
1.5
1.7
1.3
Actual value pointer (red)
1.4
Set point adjuster with green pointer
1.5
Signal pressure display
1.6
Manual/automatic switch
1.7
Adjuster for signal pressure (manual)
1.8
Differential pressure indicator
4
Lock
5
Indicating unit
Fig. 4 · Front view
Setting in manual mode:
4. Set manual/automatic switch to Manual.
5. Operate manual adjuster (1.7) for the
control signal so that the controlled vari-
able (actual value pointer 1.3) slowly
settles on the adjusted set point (set point
pointer 1.4).
Should the differential pressure indicator
(1.8) move to zero, set the manual/auto-
matic switch (1.6) to Automatic.
Proceed as described in points 6 and 7.
P
Setting in automatic mode:
4. Set the set point to the required value at
the rotary knob (1.4) on the indicating
unit.
5. Set the T
n
value (completely open) to move the red
restriction briefly to its lowest
1.3
1.4
4
5
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