Siemens SQD Series User manual

Installation Instructions

Document No. 129-553

December 22, 2011

SQD Series Valve Actuators

(For use with 1-1/2-inch to 2-inch Pressure Independent

Control Valves)

Item Number: 129-553, Rev. AA Page 1 of 4

Product Description

The SQD Actuator requires a 24 Volt power supply

and a 0 to 10Vdc or floating signal to control the

Siemens 1-1/2 inch and 2-inch 599 Series Pressure

Independent Control Valves with 1/4-inch (6.5 mm)

stroke.

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.

Product Number

Description Actuator

Code

SQD65U 0 to 10 Vdc control 235

SQD85.03U 3-position (floating) control 234

Required Tools

•1-1/4-inch open end wrench

•#2 Phillips or flat-blade screwdriver

•Flat-blade calibration screwdriver (3 mm) for

wiring connections

•Wire cutter/stripper

Estimated Installation Time

•15 minutes for wiring a factory-installed

actuator.

•30 minutes for field replacement of actuator.

Prerequisites

WARNING:

If mounting the actuator to a valve

already in line, either close the shut-off

valves in the piping (upstream first,

then downstream) or switch off the

pump to allow the differential pressure

in the valve to drop.

WARNING:

Disconnect the controller power

before replacing the actuator.

90° 90°

EA1326R1

Figure 1. Acceptable Mounting Positions with Valve.

NOTE: Vertical mounting is recommended.

Instructions

If you are mounting an actuator on a new valve, begin

with the instructions, Mounting an Actuator to a Valve.

Remove Actuator from Valve

1. Remove the actuator cover using either a #2

Phillips or a #2 flat blade screwdriver.

See Figure 2.

EA1331R1

M30 x 1.5

Figure 2.

2. Disconnect and identify the wires. Place the cover

back on the actuator.

Document No: 129-553

Installation Instructions

December 22, 2011

Remove Actuator from Valve, Continued

3. Use a 1-1/4-inch open end wrench to loosen the

coupling piece.

4. Remove the actuator from the valve.

Mounting an Actuator to a Valve

1. If you are attaching the actuator to a new valve,

remove the protective plastic cap from the valve

stem. See Figure 3.

EA1327R1

VPI45.., VPI45..Q

Figure 3.

2. Turn the manual-positioning knob

counterclockwise to “0”. See Figure 4.

EA1328R1

Figure 4.

3. Place the actuator on the valve. See Figure 5.

EA1329R1

Figure 5.

4. Use a 1-1/4-inch open-end wrench to tighten the

coupling piece to a maximum of 22 ft-lbs. See

Figure 6.

EA1330R1

Figure 6.

5. Use either a Phillips head screwdriver or a flat-

blade screwdriver to remove the actuator cover for

access to the terminal block, selector plug, and

jumper wire. See Figure 7.

EA1331R1

M30 x 1.5

Figure 7.

6. Attach wires, set the selector plug and if

necessary, cut the R–M jumper. See Wiring.

7. Place the cover on the actuator. The positioning

knob must be at “0” to fit into the shaft. If the cover

does not fit, turn it 180 degrees.

Page 2 of 4 Siemens Industry, Inc.

Document No: 129-553

Installation Instructions

December 22, 2011

8. Fasten the cover with the screws. See Figure 8.

EA1344R1

M30 x 1.5

Figure 8.

The installation is now complete.

Wiring

All wiring must conform to NEC and local codes and

regulations.

Use earth ground isolating, step-down Class 2

transformers. Do not use auto transformers.

Determine the supply transformer rating by adding

the total VA of all actuators used. The maximum

rating for Class 2 step-down transformer is 100 VA. It

is recommended that no more than 10 actuators be

SQD65U

To use a 0 to 1000 ohm input signal on terminal R,

the circuit board jumper R—M must be cut.

CAUTION:

If the circuit board jumper R–M is cut, you

cannot wire the R and M terminals on the

terminal block to re-establish the

connection.

The 0 to 1000 ohm signal is additive to the 0 to 10

Vdc control signal. For example, a controller

commanded to 2 Vdc (20%) plus a remote override

input to 300 ohms (30%) results in a position of 50%

stroke.

Figure 9. SQD65U Terminal Connections.

G, G0 24 Vac operating voltage

G System potential

G0 System neutral

Y 0 to 10 Vdc control signal

R Input for 0 to 1000 Ohm remote setting unit or

low temperature detection unit

M Measuring neutral

U Output for 0 to 10 Vdc position indication

WARNING:

Terminal connection G is 24 Vac HOT, not

ground.

CAUTIONS:

•G0 and G must be properly wired for

correct function and full life of the

actuator.

•If the actuator makes a buzzing noise

upon reaching setpoint, G and G0 are

improperly wired and should be

reversed.

SQD85.03U

NEUT

CONTROLLER ACTUATOR

EARTH GROUND

ISOLATING CLASS 2

TRANSFORMER FOR

24 Vac POWER

120 Vac

Vac

EA0795R1

Figure 10. SQD85.03U Wiring.

G 24 Vac operating voltage (system potential)

Y1 Output shaft extends, valve opens

Y2 Output shaft retracts, valve closes

Siemens Industry, Inc. Page 3 of 4

Document No: 129-553

Installation Instructions

December 22, 2011

Manual Override for SQD65U

Non-Spring Return Troubleshooting

•Check wiring for the proper connections.

•Check selector plug for recommended position.

Turn the manual positioning knob clockwise to move

the actuator stem outward. See •Check for adequate power supply.

Figure 11.

References

Turn the manual positioning knob counterclockwise

to move the actuator stem inward. See Technical Instructions Document Number

Figure 11. SQD Series Electromotoric Actuators 155-777

Pressure Independent Control Series 155-774

Two-Way Brass Valve Bodies,

1/2-Inch to 2-Inch, ANSI 250

Figure 11.

Dimensions

Figure 12. SQD Series Dimensions in Inches (Millimeters).

Minimum access

space recommended

4 inch (100 mm)

8 inch (200 mm)

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models

as design improvements are introduced. Product or company names mentioned herein may be trademarks of their respective owners.

Siemens Industry, Inc.

Building Technologies Division

1000 Deerfield Parkway

Buffalo Grove, IL 60089-4513

USA

1-847-215-1000

Your feedback is important to us. If you have

comments about this document, please

send them to

[email protected]

Document No. 129-553

Printed in the USA

Page 4

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