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ManualsBrandsSiemens ManualsLarge Stroke (BC1)Flowrite 2-1/2 to 6-Inch Valves, Two-Way and Three-Way and Actuator Assembly Selection TB 256, Technical Bulletin
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SKD6xU Electronic Valve Actuators 24 Vac Proportional Control Technical Instructions
Document Number 155-180P25
September 25, 2018
Siemens Industry, Inc. Page 7
Start-up, Continued
1
2
Figure 11. SKD Electronic Features.
DIP Switches
(Left to right)
1
Selection of
Control Signal
2
Selection of
Flow Characteristic
ON
4 to 20 mA
Modified*
OFF
Factory Setting
0 to 10 Vdc
Default
*Changing the default setting will modify an equal percentage valve to a linear flow characteristic.
When set to default, the flow characteristic is determined by the valve body.
Normally Closed Valve
Actuator pressure cylinder moves:
• Outward (0 to 1): Valve opens.
• Inward (1 to 0): Valve closes.
Normally Open Valve
Actuator pressure cylinder moves:
• Outward (0 to 1): Valve closes.
• Inward (1 to 0): Valve opens.
Three-Way Valve
Actuator pressure cylinder moves
• Outward (0 to 1): Valve opens between port NC and C.
• Inward (1 to 0): Valve opens between ports NO and C.
The measuring voltage at terminal U provides valve stem position feedback to an
indicating instrument or building automation system.