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MT Series SSC Electronic Valve Actuator, 24 Vac Floating (3-Position) Control
Wiring
Wiring Diagrams
Siemens Building Technologies, Inc.
Use earth ground isolating, step-down Class 2 transformers. Do not use
autotransformers.
Determine supply transformer rating by summing total VA of all actuators used. The
maximum rating for a Class 2 step-down transformer is 100 VA.
Do not power more than 10 actuators by one transformer.
CAUTION:
Terminals must be properly wired for correct function and full life of the
actuator.
CONTROLLER
24
NEUT
Vac
Y2...Retracts actuator shaft
Y1...Extends actuator shaft
G
System potential
Figure 4. SSC81U Non-Spring Return.
CONTROLLER
24 Vac
NEUT
EARTH GROUND
ISOLATING CLASS 2
24 Vac TRANSFORMER
Y2...Retracts actuator shaft
Y1...Extends actuator shaft
G... System potential
G0...System neutral
Figure 5. SSC81.5U SR Neutral.
ACTUATOR
0
Y2
1
Y1
G
EARTH GROUND
ISOLATING CLASS 2
TRANSFORMER FOR
24 Vac POWER
120 Vac
ACTUATOR
0
Y2
1
Y1
0
G
G0
120 Vac
Technical Instructions
Document Number 155-314P25
CONTROLLER
ACTUATOR
24 Vac
NEUT
EARTH GROUND
ISOLATING CLASS 2
24 Vac TRANSFORMER
120 Vac
Y2...Retracts actuator shaft
Y1...Extends actuator shaft
G... System potential
G0...System neutral
Figure 6. SSC81.5U SR Hot Switch
August 1, 2007
0
Y2
1
Y1
0
G
G0
Page 5
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