| is used for S2 open-loop control operation
(OPEN/CLOSE valves). Normally it is not necessary to reach intermediate
positions. Therefore control signals are self-retaining. After
a positioning signal the actuator runs to the respective end
position. If the actuator is to stop before the end position
is reached, the control signal STOP has to be set. |
for hold-to-run operation. Also intermediate
positions of the valve can be set. The actual position is indicated
by a standard 4-20mA signal. Power supply is already integrated.
The actuator runs as long as the control signal is active. There
is no self-retaining of the control signals in hold-to-run operation.
A brake motor can be used to achieve a higher positioning accuracy.
|
for closed-loop control operation. Positioning
is carried out by the integrated position controller SRG. In
remote mode the actuator is controlled by a setpoint signal
of 4-20mA. The position controller compares the actual value
to the setpoint and corrects positioning in case of deviation.
The actual value can also be used externally. A brake motor
can be used to achieve a higher positioning accuracy. |
