Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control
Document Number 155-314P25
May 10, 2011
Page 2 Siemens Industry, Inc.
Warning/Caution Notations
WARNING:
Personal injury or loss of life may occur if you do not perform
a procedure as specified.
CAUTION:
Equipment damage may occur if you do not follow a
procedure as specified.
Specifications
Power requirements
Operating voltage 24 Vac ±20%
Frequency 50/60 Hz ±2 Hz
Power supply Earth ground isolating, Class 2,
24 Vac transformer
NOTE: Do not power more than
10 actuators with one
transformer.
SSC81U power consumption 0.8 VA
SSC81.5U power consumption 3 VA at ultra cap load,
2 VA at normal operation
Running time
SSC81U 125 s ±2% at 60 Hz
SSC81.5U 125 s ±2% at 50/60 Hz
Functional operation
Spring return, SSC81.5U only (
Figure 1, ) ≈ 30 s
Nominal stroke 7/32-inch (5.5 mm)
Nominal force 67 lb (300N)
Stroke/signal relationship Linear
Capacitor charge time (
Figure 1 ) max. 180 sec
Spring return (SSC81.5U only) Non-mechanical, electronic returns
to stem up (0 position)
Agency certification
UL UL873 Listed
cUL Certified to CSA
C22.2 No. 24-93
Ambient conditions
Ambient temperature
Operation 41°F to 122°F (5°C to 50°C)
Transport and storage -13°F to 158°F (-25°C to +70°C)
Ambient humidity 0 to 90% rh (non-condensing)
Media temperature 41°F to 248°F (5°C to 120°C)
Physical characteristics
Wiring Connection Plenum cable or 3/8-inch flex conduit
Weight
SSC81U 1.1 lb (0.5 kg)
SSC81.5U 1.3 lb (0.6 kg)
Dimensions See
Figure 10
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