User Guide

Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac Proportional Control
Document Number 155-313P25
June 7, 2013
Page 2 Siemens Industry, Inc.
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.
SSC61U power consumption 2 VA
SSC61.5U power consumption 3 VA at ultra cap load,
2 VA at normal operation
Control characteristics
Control signal (Y)
Voltage 0 to 10 Vdc (default) or 0 to 20 mA with
external 500 ohm, 0.2W resistor
Current 0.1 mA
Functional operation
Running time
at 50/60 Hz 30 sec ±10%
Spring return, SSC61.5U only (
Figure 1) ≈ 25 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 seconds
Spring return (SSC61.5U only) Non-mechanical, electronic return fails
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) with
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
SSC61U 1.1 lb (0.5 kg)
SSC61.5U 1.3 lb (0.6 kg)
Dimensions See
Figure 7