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IC 40 function
4.5.2 2-point operation with flame proving period
Operating mode 2
In idle state (DI 1 with no signal), the actuator is in “low”
position
(“low” position may also be 0° = “closed” position).
If digital input DI 1 is activated, the actuator moves to
“middle” position in running time t1.
After the waiting time t2, the actuator automatically
moves
further to “high” position in running time t3.
As the voltage at digital input DI 1 drops, the actuator
closes to the “low” position in running time t4.
If the signal at digital input DI 1 is deactivated before
“high” position is reached, the actuator moves directly
to “low” position in the percentage time of t4.The
actuator operates in high/middle/low
(high/middle/closed) intermittent mode.
On burners which must ignite during opening of the
butterfly valve, the waiting time t2 is appropriate for
flame proving.
Possible parameter set for this operating mode: P
68021, see page 54 (Parameter sets).