Siemens 6DR2210, Manual

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Manual 4 Commissioning
4.1 Adapting the controller direction of effect to the controlled system
SIPART DR22 6DR2210
C79000-G7476-C154-03
215
4 Commissioning
4.1 Adapting the controller direction of effect to the controlled system
D
Definitions
Normal effect system
Increasing y causes increasing x; e.g. increasing energy supply or increasing mass flow
causes increasing temperature.
Normal effect final control element (valve):
Increasing current or actuating c
∆
y cause actuator to open (increasing y); e.g. a
greater energy supply or greater mass flow. y
An
is the displayed manipulated variable.
In cascade controls the folow--up controller for observing the direction of effect of the master
controller is considered part of the controlled system.
The direction of effect of the controller is referenced to the main controlled variables FE1
and FE3. The following statements apply for normal effect transmitters (increasing physical
variable causes increasing transmitter current), increasing process display (dE*
>
dA*) and
no reservation in the freely connectable range or no falling characteristic in linearization in
the fixed connected range.
D
Direction of effect of system and actuator known
K controller
The following is prescribed: Select the desired effect here:
This gives settings of S54 or S56
Direc-
tion
of effect
Direc-
tion
of effect
Direc-
tion
of effect 20 mA
pressing the right key
causes in manual operation
This gives settings of S54 or S56
and S68 and function
of the controller
of effect
of the
system
of effect
of the
actua-
tor
of effect
of the
system
and the
actua-
tor
20 mA
on
actua-
ting
current-
ly
valve actual
value/
control-
led
variable
S54
or
S56
Kp
(cP)
S68 y
An
=
l
normal normal 100 % rises opens rises 0 pos. 0 y
normal
rever-
sing
rever-
sing
0 % falls opens rises 1 neg. 1 100 % - y
normal rever-
0 % falls closes rises 1 neg. 1 100 % - y
rever-
i
normal rever-
sing
100 % rises opens falls 1 neg. 0 y
rever
sing
rever-
i
normal 100 % rises closes rises 0 pos. 0 y
sing
0 % falls opens falls 0 pos. 1 100 % - y
Two more lines could be added to the table which are useless in practice: normal effect system in which the actual values
falls with a rising change in the manipulated variable.
Table 4-1 Controller direction of effect and y-display direction of effect of the system and actuator
direction of effect in K-controllers