Function

Decription

Type

3-position control

A 3-position signal controls the actuator via connection terminals Y1 or Y2. The desired position is transmitted to the valve.

SAX31.., SAX81..

Modulating control

The modulating positioning signal provides stepless motor control. The positioning signal range (DC 0...10 V / DC 4...20 mA / 0...1000 Ω) corresponds to the positioning range (closed...open, or 0…100% stroke) in a linear manner.

SAX61..

Positioning signal and characteristic changeover

Setting with DIL switch.

Factory setting:

  • Characteristic curve: log = Equal percentage (switch set to “OFF”)
  • Positioning signal: DC 0...10 V (switch set to “OFF”)

Position feedback U

Signal returned to acquire the position via input.

SAX61.., SAX61../MO

Forced control

(Z-mode)

Forced control helps override automatic mode and is implemented via higher control.

Calibration

Carry out during initial commissioning. The actuator drives to the top or bottom end position; the measured values are saved.

Valve seat detection

The actuators have power-dependent seat detection. After calibration, the exact valve stroke is stored in the actuator's memory.

Foreign body detection

After clogging is detected, three attempts are made to get past clogging. If unsuccessful, the actuator continues to follow the positioning signal only within a limited range, and the LED blinks red.

Modbus RTU (RS-485), not galvanically isolated

Setpoint 0...100 % valve position

Actual value 0...100 % for valve position

Forced control Open / Close / Min / Max / Stop

Setpoint monitoring and backup mode

SAX61../MO