Product Overview

Document No. 129-217
Installation Instructions
September 30, 2002
Page 4 of 6 Siemens Building Technologies, Inc.
EA0746R1
EARTH GROUND
ISOLATING CLASS 2
TRANSFORMER FOR
24 Vac POWER
120 Vac
1
0
Y2
Y1
G
NEUT
CONTROLLER
24
Vac
NEUT
CONTROLLER
24
Vac
3Y1 Y2
4
G
11
Cm1
5
c1
3
4
5
c2
1000
100%
0%
100%
0%
cba
EA0448R2
ASZ7.3ASC9.3DU
Figure 12. Non-Spring Return SKD82.50U.
Connecting Terminals
G System Potential 24 Vac (+)
Y1 Outward movement of coupling piece (0 to 1)
Y2 Inward movement of coupling piece (1 to 0)
Cm1 Limit switch for 100% stroke
c1 ASC9.3DU double auxiliary switch
c2 ASC9.3DU double auxiliary switch
1000 Ω
ASZ7.3 potentiometer
The diagram shows all possible connections. How
many and which are used depend on the application.
EA0745R1
EARTH GROUND
ISOLATING CLASS 2
TRANSFORMER FOR
24 Vac POWER
120 Vac
21
Y2
Y1
G
1
0
0
NEUT
CONTROLLER
24
Vac
ASZ7.3ASC9.3DU
3Y1 Y2
4
G
11
Cm1N.O.
5
c1
3
4
5
c2
1000
100%
0%
100%
0%
cba
21
EA0447R2
Figure 13. Spring Return SKD82.51U.
Connecting Terminals
G System Potential 24 Vac (+)
21 System Neutral (SN)
Y1 Outward movement of coupling piece (0 to 1)
Y2 Inward movement of coupling piece (1 to 0)
Cm1 Limit switch for 100% stroke
c1 ASC9.3DU double auxiliary switch
c2 ASC9.3DU double auxiliary switch
1000 Ω
ASZ7.3 potentiometer
The diagram shows all possible connections. How
many and which are used depend on the application.
Start-Up
Check the wiring for proper connections.
Consult Technical Instructions 155-180P25 for detailed
commissioning information.
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: Valve opens between port NC and C.
• Inward: Valve opens between ports NO and C.
NOTE: The valve body assembly determines the
complete assembly action.