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IC 40 function > Standard operating modes 1 – 12
4.5.5 3-point step operation
Operating mode 5
If only digital input DI 1 is active, the actuator opens. If only
digital input DI 2 is active, the actuator closes.
If none of the two digital inputs or both digital inputs is or
are active simultaneously, the actuator stops in its position.
This means that it can stop at any position.
The actuator operates in continuous mode and is
controlled via a 3-point step signal. The actuating function
is limited by the “low” and “high” positions (“low” position
may also be 0° = “closed” position).
The opening speed is pre-set via the time t1 for the entire
“low” to “high” actuating travel. Accordingly, the closing
speed is set with t2 for the entire “high” to “low” actuating
travel
Possible parameter sets for this operating mode: P 68012, P
68013, P 68014, see page 54 (Parameter sets).
This method of control is frequently used on furnaces and
kilns in the sector of ceramics, steel and aluminium
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