Wiring Diagrams; Manual Override - Siemens Powermite 599 Series Technical Instructions

MT Series SSC Electronic Valve Actuator, 24 Vac 3-Position (Floating) Control
Wiring

Wiring Diagrams

Manual Override

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 (Fail-in-Place)
Wiring.
For manual positioning, the manual
override knob in the center of the position
indicator per Figure 6.
ACTUATOR
0
Y2
1
Y1
G
EARTH GROUND
ISOLATING CLASS 2
TRANSFORMER FOR
24 Vac POWER
120 Vac
Figure 5. SSC81.5U (Fail-Safe) Wiring.
Technical Instructions
Document Number 155-314P25
CONTROLLER
ACTUATOR
Y2
Y1
G
G0
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
COUNTER
CLOCKWISE
A
RETRACTS
SHAFT
A B
Figure 6. Manual Override.
May 24, 2005
0
1
0
CLOCKWISE
B
EXTENDS
SHAFT
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