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Pressure Independent

Control Series

Technical Instructions

Document No. 155-777

December 22, 2011

SQD Series Electromotoric Actuators

Floating or 0 to 10 Vdc Control

Siemens Industry, Inc.

Description

Pressure Independent Control Series SQD Electronic Valve Actuators require a

24 Vac power supply and receive a floating control signal (SQD85.03U) or a

proportional 0 to 10 Vdc signal (SQD65U) to control a valve.

These actuators are designed to work with 1-1/2 inch and 2-inch Pressure

Independent Control Series Valves with a 1/4-inch (6.5 mm) stroke and a threaded

valve bonnet that fits the actuator.

Features

• Positioning force > 90 lbs (400 N)

• UL listed for plenum installation

• Direct mounting on valves; no adjustments required

• Visual position indication

• Manual override

• Electromotoric actuator, maintenance-free

• Reversible synchronous motor

• Antilocking gear train

• Load-dependent switch-off in stroke limit positions reduces power consumption

Application

For use in heating and cooling HVAC applications with Pressure Independent Control

valves that require up to 90 lbs. (400N) actuator force. They can be used in chilled/hot

water applications or in water-glycol solutions up to 50% in closed loop systems.

Product Numbers

Table 1.

Product Number Description Actuator Prefix

Code

SQD65U 24 Vac, 0 to 10V, 400N, NSR PICV Actuator 235

SQD85.03U 24 Vac, 3-position, 400N, NSR PICV Actuator 234

Summary of content (4 pages)

PAGE 1
Technical Instructions Document No. 155-777 December 22, 2011 Pressure Independent Control Series SQD Series Electromotoric Actuators Floating or 0 to 10 Vdc Control Description Pressure Independent Control Series SQD Electronic Valve Actuators require a 24 Vac power supply and receive a floating control signal (SQD85.03U) or a proportional 0 to 10 Vdc signal (SQD65U) to control a valve.
PAGE 2
Technical Instructions Document Number 155-777 December 22, 2011 Pressure Independent Control SQD Series Electromotoric Actuators Warning/Caution Notations WARNING: Personal injury/loss of life may occur if you do not perform a procedure as specified. CAUTION: Equipment damage may occur if you do not perform a procedure as specified. Specifications Operating voltage Power supply Rated voltage Frequency Fusing of supply lines Power consumption SQD65U SQD85.03U Terminals Y1, Y2 (SQD85.
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Pressure Independent Control SQD Series Electromotoric Actuators Technical Instructions Document Number 155-777 December 22, 2011 Operation Voltage at Y1: SQD85.03U Voltage at Y2: 3-position control signal No voltage at Y1 or Y2: SQD65U 0 to 10 Vdc or 0 to 1000 Ω control signal Engineering Notes Stem extends, valve opens Stem retracts, valve closes Actuator holds the current position • The valve opens/closes in proportion to the control signal at Y or R.
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Technical Instructions Document Number 155-777 December 22, 2011 Wiring Diagrams Pressure Independent Control SQD Series Electromotoric Actuators CONTROLLER ACTUATOR Y2 SQD85.03U Y1 0 1 G NEUT 24 Vac Y1 Signal input; stem extends, valve opens Y2 Signal input; stem retracts, valve closes G System potential (SP), 24 Vac EA0795R1 EARTH GROUND ISOLATING CLASS 2 TRANSFORMER FOR 24 Vac POWER WARNING: Terminal connection “G” is 24 Vac Hot (system potential) not ground (system neutral).