3-Point Step Operation With Low Position - Honeywell KromSchroder IC 40 Technical Information

Function
high
middle
low
closed
DI 1
DI 2
Operating mode 12

3 .5 .12 3-point step operation with low position

Operating mode 12
If a three-point step signal is applied to DI 1 (DI 2 with
no signal), the butterfly valve moves to "high" position.
If a three-point step signal is applied to DI 2 (DI 1 with
no signal), the butterfly valve moves to "middle" posi-
tion.
If no three-point step signal is applied to the inputs
(DI 1 and DI 2 with no signal), the actuator stops and
the butterfly valve remains in its current position.
If a three-point step signal is applied to inputs DI 1 and
DI 2, the actuator moves from the low-fire rate position
to "low" position.
IC 40 · Edition 07.18
t t
1 2
DI 1 DI 2 IC 40 position
Off Off Idle/Stop
On Off Open to high position
Off On Close to middle position
On On
Example of application, see page 7 (Continuous
control by three-point step signal).
t
1
t [s]
t [s]
Valve position
Idle
Open to high-fire rate
Close to low-fire rate
low Valve closes further
30