SQM5…
Technical Instructions
Document No. 155-517P25
Rev. 1, July, 2000
Reversing Actuators
ISO 9001
REGISTERED FIRM
®
EA0511R1
Siemens Building Technologies, Inc.
Description
SQM5... reversing actuators are used for the positioning of flow control valves, butterfly
valves, dampers, or any application requiring rotary motion. The SQM5… actuators
accommodate control input signals of 4-20 mA, 0-135 Ω, 0-10 Vdc, 0-20 mA, position
proportional and floating control. The available output signals include 4-20 mA,
0-135 Ω, 0-10 Vdc, 0-20 mA, and 0-1000 Ω. SQM5… actuators are available with up to
eight internal, easily accessible and adjustable auxiliary switches.
A selection of exchangeable circuit boards provide a variety of functions including
auto/manual selector switch, manual forward/reverse toggle switch, zero and span
adjustment, parallel or master/slave operation, split range control, input signal override,
and selectable electronic linearization.
The SQM5… is engineered for precision. It is particularly well suited to applications
requiring a high degree of modulating accuracy and repeatability. Drive shaft play is
limited to 0.3° with a modulating accuracy of 250 repositions through 90° of travel.
The SQM5… actuator may be mounted in any position. A selection of mounting
brackets and shafts provide installation flexibility and allow for the simple replacement of
most competitive actuators.
Features
• Modulating accuracy of 250 repositions through 90°
• Two limit switches, plus up to six internal auxiliary switches
• Full closed “economy position” switch
• Drive shaft and cam drum disengagement clutches
• Auto/manual switch, manual control forward/reverse toggle switch
• UL, CSA and CE approved 24, 110 and 220 Vac versions
• Field reversible clockwise (cw) or counterclockwise (ccw) operation
• Various torque ratings and running times available
• Selection of field exchangeable one and two ended shafts
• Mounting brackets to replace competitive actuators
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