connect sts61 siemens thermal actuator

hi 

how to connect this wires in real in attached photo ?

I use LOGO power to convert 240VAC to 12VDC then I put potentiometer to convert 12VDC to 10VDC,

and I connect G & G0 with 24VAC

but I had a problem with connect Y1 and Y2

Hi Jsaidi

STS161 is a modulating actuator. This means you will need to connect 24VAC on G/G0 for power and a control signal between 0VDC and 10VDC for the position setpoint. Depending on the valve being normally open (without an actuator connected, the valve spring opens the valve. E.g. VD1..CLC) or normally closed (without an actuator connected, the valve spring closes the valve. E.g. V..P47) you should use the white or the red wire for the control signal. In the end this determines the opening direction of the actuator. The datasheet explains the context in a very detailed manner on p. 3 to 5.

Y1 and Y2 are usually constant voltages (230VAC, 24VAC or 24VDC, depending on the actuator type) operated with switches for 3-Point actuators that either drive the valve towards the open position (Y1) or towards the closed position (Y2). However, in the STS161 datasheet Y1 and Y2 stand for the actuator instance, which is a very unfavorable nomenclature in my opinion. Y1 is actuator number 1, Y2 is actuator number 2. This has nothing to do with the input signals for 3-Point actuators, so there is no Y1-wire or Y2-wire that could be connected.

I hope this helps.

Kind Regards, Konrad