IC 40 · Edition 07.18
18
t [s]
high
low
closed
DI 1
DI 2
t [s]
middle
t
1
t
2
Function
This may prove to be practical in order to purge a fur-
nace or kiln via DI 1 (independently of DI 2), for instance.
It is then possible to operate with both inputs in high/
middle/low intermittent mode.
Possible parameter sets for this operating mode:
P 68015, P68016, see page.45 (Parameter sets).
Control via one digital input
If digital input DI 1 is activated (DI 2 with no signal), the
actuator moves to “high” position. The running times t
1
and t
2
run directly in succession.
Likewise, the actuator closes within the successive run-
ning times t
3
and t
4
if signal DI 1 drops. The “middle”
position serves as an interpolation point and can be
freely programmed.
Owing to the two successive running times, the open-
ing characteristic of the butterfly valve can be changed.
For example, the characteristic of the air circuit can be
adapted to that of the gas circuit.
Running times up to 51 s (2 x 25.5 s) are possible in this
operating mode. If the signal at digital input DI 1 is de-
activated before “high” position is reached, the actuator
moves directly to “low” position within the percentage
times of t
3
and t
4
.
The actuator operates in high/low (high/closed) inter-
mittent mode.
DI 1
DI 2
Position
Off
Off
low/closed
On
Off
high
Operating mode 3