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3 IC 20 function
The actuator IC 20 moves towards 0° or 90° if it is energized
electrically at the related terminal. If the voltage is
disconnected, the actuator stops at the current position. A
high holding torque when de-energized renders additional
braking elements su-perfluous. The low-fire and high-fire
rates are adjusted using two infinitely adjustable switching
cams (S3, S4). An optional integrated feedback
potentiometer offers the option of moni-toring the current
position of the actuator.
The actuator IC 20 is optimally tailored to the
Kromschröder butterfly valves BVG, BVGF, BVA, BVAF,
BVH, BVHS or linear flow control VFC.
IC 20.E
In normal operation, input “OK” is supplied with voltage.
The setpoint device issues an actuating signal (0 (4) – 20
mA, 0 – 10 V). The current signal corresponds to the
adjustment angle to be approached (e.g. with a 0 – 20
mA signal, 10 mA correspond to a valve angle of 45°). The
minimum and maxi-mum adjustment angles can be set
manually using the keys. The hysteresis can be adjusted on
a potentiometer to suppress interference in the input
signal.
The IC 20..E offers the option of monitoring the current
position of the actuator via the continuous 4 – 20 mA
output signal.
Automatic/Manual mode
Switchover between Automatic and Manual mode
facilitates setting of the infinitely adjustable switching
cams during com-missioning. This enables precise settings
even in the low-fire rate range.
The switching point is set directly on the cams with a
screw-driver.
External devices can be activated or intermediate
positions can be checked via two additional, floating,
infinitely adjust-able switches.
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