9.1.1 Connecting the control line
For the connection of the lines, refer to section
"5.2 Establishing the connection ".
Control voltage
0 (2)
to
10 V
:
(
−
) Clamp
57
(+) Clamp
56
Control current
0 (4)
to
20 mA
:
(
−
) Clamp
57
(+) Clamp
59
10 V (20 mA)
=
^
Actuator stem up ("OPEN")
2 V (4 mA)
=
^
Actuator stem down ("CLOSED")
9.1.2 Feedback signal
You can measure the actual value either as:
– Voltage
0 (2)
to
10 V
(
−
) Clamp
58
(+) Clamp
61
or
– Current
0 (4)
to
20 mA
:
(
−
) Clamp
58
(+) Clamp
60
The output signal always corresponds to the
input signal at a tolerance of approx. 200 mV
or 0.2 mA compared to the input.
The feedback signal is in the same direction,
i.e. an increasing input signal (set point) also
causes an increasing feedback signal.
The feedback signal must
not
be adjusted and
is
not
electrically isolated from the input.
9.2
Corrections with potentiome-
ters "A" and "B"
An LED simplifies the adjustment of the final
points.
– Potentiometer "A" for upper set point mark:
Turn clockwise, travel becomes shorter.
– Potentiometer "B" for lower set point mark:
Turn clockwise, travel becomes longer.
The red LED signalizes: actuator in final posi-
tion, no manipulated variable is generated,
the set point has been reached.
Fig. 24
⋅
Potentiometer "A" and "B",
Poti "B" on left, Poti "A" on right;
reversing plug in background
NOTE!
To keep the influence of the disturbing pulse
as small as possible, the control signal (set
point) must be routed to the actuator via sep-
arate line with tin-plated copper braiding as
screening!