SIPART DR20
Project Planning Manual
Planning example
K9
Ratio control
with a ratio station and a slave controller
The process variable x1, also from a four-wire transmitter, is applied to the slave controller. Only
for indication of the process ratio factor xv, it can be linked to input AE3 of the ratio station in a
current loop with input AE1 of the slave controller. If this is not necessary, input module
6DR2800-8J must not be equipped and x1 is directly connected to the slave controller.
By switchover of the ratio station to manual operation, the setpoint of the slave controller is
adjusted by the manual manipulated variable: the ratio control is now changed to a fixed setpoint
control. If S17 in the ratio station is set to “1” the switchover back to automatic mode is hitchless
and droopless by x-tracking (wv is tracked).
The alarm circuit in the slave controller monitors the negative deviation xd for max./min. deviations
(set parameter A1 = max and A2 = min).
Setting of configuring switches of the slave controller:
S1 = 4, S10 = -1
AE1
AE2
BE
BA
L+
GND GND
Iy
1
2
3
4
5
6
7
8
SIPART DR20 K
6DR2004-1 (AC 230 V)
6DR2004-2 (AC 115 V)
6DR2004-4
(UC 24 V)
1
2
3
4
1
2
3
4
1
2
3
4
PE
N
L
AC 115 V
AC 230 V
⎫
⎬
⎭
PE
N
UC 24 V
L
⎫
⎬
⎭
Slot 3 GW
Slot 2 AE4
Slot 1 AE3
5
M1
A1
R1
A2
M2
not equipped
Option module
6DR2801-8A
M
M/A
S
E
not equipped
I
y
+
-
Slave controller
Process variable x1
Reference line M
Setpoint line to slave controller
121
