Krom Schroder IC 20 - IC 40, Continuous Control by Three-Point Step Signal

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Application > Examples of application
1.1.6 IC 40, continuous control by three-point step signal
The actuator IC 40 is controlled by the three -point step
controller 3PS and moves the butterfly valve BVA to the
ignition position. The burner starts.
Once the burner is operating, the operation signalling
contact of the burner control unit BCU 460 closes. The BCU
issues the controller enable signal to the temperature
controller. The butterfly valve opens or closes between the
low-fire and high-fire rate positions depending on the
capacity demand of the burner. When the three -point
step signal is disconnected, the butterfly valve stops at its
current position.
If both inputs on the IC 40 (DI 1 and DI 2) are actuated
after the burner has been shut down, the butterfly valve
closes further than the low-fire rate position (see
Operating mode 12, 3-point step operation with low
position)
DI 1
DI 2
IC 40 position
Valve position
Off
Off
Idle/Stop
Idle
On
Off
Open to high position
Open to high-fire rate
Off
On
Close to middle position
Close to low-fire rate
On
On
low
Valve closes further