Siemens SSD81U Owner's manual

Pressure Independent

Control Series

Technical Instructions

Document No. 155-773

September 1, 2015

SSD Electronic Valve Actuators

Floating or 0 to 10 Vdc Control

Spring Return

Non-Spring Return

Siemens Industry, Inc.

Description Pressure Independent Control Series SSD Electronic Valve Actuators require a 24 Vac

power supply and receive a floating control signal (SSD81…) or a proportional 0 to

10 Vdc signal (SSD61…) to control a valve. The 0 to 10V SSD61U actuator also

accepts a 24 Vdc power supply.

These actuators are designed to work with 1/2- to 1-1/4 inch Pressure Independent

Control Series Valves with a 1/10-inch (2.5 mm), 1/5-inch (5 mm), or 7/32-inch (5.5 mm)

stroke and a threaded valve bonnet that fits the actuator.

Features •Nominal force >56 lbs (250 N)

•Automatic stroke calibration on the SSD61…

•UL listed for plenum installation

•Reduced power consumption in holding position

•Direct coupled installation without tools (hand-tightened)

•Manual override

•Visual position indication

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

valves. They can be used in chilled/hot water applications or in water-glycol solutions up

to 50% in closed loop systems. The Spring Return SSDx1.5U Series actuators accept

plenum cable or 3/8-inch flex conduit connections.

Product Numbers Table 1.

Product Number

Description

Operating Mode

Actuator Prefix Code

SSD81U Floating Fail-in-place 230

SSD61U 0 to 10 Vdc Fail-in-place 231

SSD81.5U Floating Fail-safe 232

SSD61.5U 0 to 10 Vdc Fail-safe 233

Technical Instructions Pressure Independent Control

Document No. 155-773 SSD Series Electronic Valve Actuators

September 1, 2015

Page 2Siemens Industry, Inc.

Ordering

Information To order a complete valve plus actuator assembly from the factory, combine the

actuator prefix code with the suffix of the valve product number. To order an actuator

only, use the product number.

Specifications

Power supply

SSD81U

SSD61U

SSDx1.5U

Operating voltage Vac

24 Vac ±20%

Frequency

50/60 Hz

Operating voltage Vdc

—

24 Vdc ±25%

—

Power consumption

Normal operation

At ultra cap load

0.8 VA max.

—

2.5 VA max.

—

2 VA

3 VA

Control Characteristics

SSD81…

SSD61…

Control signal

Floating

0 to 10 Vdc

Output impedance

—

>100K ohm

Positioning accuracy 0 to 10 Vdc

—

<2% of

nominal stroke

Function

SSD81U

SSD61U

SSD81.5U

SSD61.5U

Run time (in seconds)

2.5 mm stroke 75 45 70 15

5/5.5 mm stroke

150

125

Spring return (in seconds)

2.5 mm stroke — — 15 15

5/5.5 mm stroke

—

Nominal force

>56 lbs.

(250N)

>56 lbs.

(250N)

>67 lbs.

(300N)

>67 lbs.

(300N)

Capacitor charge time

(in seconds)

—

180 max.

Spring return

(SSDx1.5U only)

—

Non-mechanical,

electronic. Returns to stem

up (0 position).

Agency Certification

UL Listed to UL873

cUL Certified to Canadian Standard

C22.2 No. 24-93

Ambient Conditions

Ambient temperature

Operation 41°F to 122°F (5°C to 50°C)

Transport/Storage -13°F to 158°F (-25°C to 70°C)

Humidity

Operation 5 to 85% rh

Transport <95% rh

Storage 5% to 95% rh

Miscellaneous

Dimensions See Figure 13 and Figure 14.

Weight

SSDx1U 12.3 oz. (0.35 kg)

SSDx1.5U 1.3 lbs. (0.6 kg)

Pressure Independent Control Technical Instructions

SSD Series Electronic Valve Actuators Document No. 155-773

September 1, 2015

Siemens Industry, Inc. Page 3

Accessories

Figure 1. Conduit Connector.

ASY97 Conduit connector (quantity one).

For SSD61U and SSD81U only.

Figure 2. Terminal Plug and

Block Cover.

Terminal plug and terminal block cover

(quantity: one each). For SSD61U and

SSD81U only.

•ASY99 SSD81U actuator

floating control.

•ASY100 SSD61U actuator

0 to 10 Vdc control.

ASY98 Replacement screw and nut for use on the conduit connector or the terminal

connector, quantity one each. For SSD61U and SSD81U only.

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.

Operation

CAUTION:

A valve must be connected to the actuator before applying power.

If applying power to the actuator when a valve is not connected, the

actuator will respond to a control signal and the shaft will extend until it

reaches its maximum end stop. Thereafter, it will not respond to any

signal. If this occurs:

1. Disconnect power.

2. Turn the manual position indicator (see Figure 7)on the top of the

actuator to the 0 position and verify the actuator shaft completely

retracts.

3. Connect a valve to the actuator.

4. Reapply power. The actuator will return to normal operation.

Technical Instructions Pressure Independent Control

Document No. 155-773 SSD Series Electronic Valve Actuators

September 1, 2015

Page 4Siemens Industry, Inc.

Operation,

Continued

SSD81U

A 24 Vac control signal to terminal Y1 extends the actuator shaft proportionately to the

length of time the signal is applied.

A 24 Vac control signal to terminal Y2 retracts the actuator shaft proportionately to the

length of time the signal is applied.

In the event of a power failure with no control voltage, the non-spring return SSD81U will

hold its last position.

The SSD81U floating actuator does not self-calibrate.

SSD61U The stroke travel on the SSD61U is proportional to the control signal Y. A zero voltage

control signal retracts the stem and returns the valve to its normal position. With no

supply voltage, the SSD61U actuator maintains its last position.

Calibration Stroke

The SSD61U is equipped with a microprocessor to control the valve stroke length. The

actuator will complete a stroke calibration each time the power supply voltage is

connected.

CAUTION:

Whenever the SSD61U runs a self-calibration routine (Valve stroke 0

Max. stroke Setpoint), do not manually intervene in this process. See

Figure 3.

Figure 3. SSD61U Self-Calibration.

NOTE: Correct calibration is possible only with valve strokes >1.5 mm. For valve

strokes <1.5 mm, the actuator/valve combination locks after three failed

calibration attempts.

SSDx1.5U For the SSD81.5U, a 24 Vac control signal to terminal Y1 extends the actuator shaft

proportionately to the length of time the signal is applied.

A 24 Vac control signal to terminal Y2 retracts the actuator shaft proportionately to the

length of time the signal is applied.

The stroke of the SSD61.5U is proportional to the control signal on terminal Y. A 0 Vdc

control signal retracts the stem and returns the valve to its normal position.

In the event of a power failure, the SSDx1.5U returns to the stem up, or normal position.

The SSDx1.5U includes an electronic return mechanism that functions as follows. See

Figure 4.

Pressure Independent Control Technical Instructions

SSD Series Electronic Valve Actuators Document No. 155-773

September 1, 2015

Siemens Industry, Inc. Page 5

Operation,

SSDx1.5U

Continued

•At power-up (t0), a capacitor must

charge to its maximum capacity (Max,

tc). This will take a maximum of 180

sec, during which time no actuator

movement occurs.

•Once the capacitor is fully charged (tc),

normal actuator operation occurs.

•If a subsequent power failure occurs

(tn) of greater than 5 seconds, the

capacitor discharges (td) and the

actuator spring returns to stem up 0

position.

Figure 4. SSDx1.5U Electronic Spring

Return Mechanism.

Calibration Stroke

SSD61.5U The SSD61.5U writes its calibration stroke parameters to nonvolatile memory on the

first startup of the actuator. Successive startups bypass the calibration stroke unless the

memory is manually cleared. If installing the actuator on a different valve (such as on a

replacement valve), manually clear the calibration stroke from memory as follows:

1. Remove the terminal cover using a

Phillips head screwdriver.

2. Locate hole on the circuit board

shorting bars.

3. Insert and gently twist a flat-blade

screwdriver to electrically connect the

shorting bars (see Figure 5). The

SSD61.5U then performs a new

calibration stroke.

4. Secure the terminal cover back in

place.

Figure 5. Manually Clearing Calibration

Stroke from Memory.

Mounting and

Installation

Figure 6. Mounting Positions.

Mount the actuator in one of the allowable positions shown in Figure 6.

When mounting the actuator in a plenum, the proper cable must be attached to meet

local codes.

Allow 8 inches (200 mm) above the actuator and 8 inches (200 mm) behind the cable

for service.

Installation instructions are included with the actuator.

Technical Instructions Pressure Independent Control

Document No. 155-773 SSD Series Electronic Valve Actuators

September 1, 2015

Page 6Siemens Industry, Inc.

Manual Override The actuator can be driven manually to any position between 0 and 1 with a 3 mm hex

wrench. The control signal from the controller, however, will take priority over any

manual position.

For manual positioning (without power), insert the 3 mm hex wrench in the center of the

position indicator. See Figure 7. The actuator will maintain its position until power is

provided or restored.

Figure 7. Manual Override Operation.

•(A) Turn hex wrench counterclockwise to retract the spindle.

•(B) Turn hex wrench clockwise to extend the spindle.

NOTE: Do not perform manual override while the power supply is connected; the

actuator will not track accurately when the control signal is applied. A short

power off/power on sequence is recommended to recalibrate the SSD61U

actuator.

Wiring

•Do not use autotransformers. Use earth ground isolating step-down Class 2 power

supplies.

•Determine supply transformer rating by summing total VA of all actuators used.

•It is recommended that no more than 10 actuators be powered by one transformer.

Figure 8. SSD81U Wiring Diagram.

WARNING:

Terminal connection “G0” is

Common, not ground.

Figure 9. SSD61… Wiring Diagram.

Pressure Independent Control Technical Instructions

SSD Series Electronic Valve Actuators Document No. 155-773

September 1, 2015

Siemens Industry, Inc. Page 7

Wiring, Continued

Figure 10. SSD81.5U Neutral Switching

Spring Return.

Figure 11. SSD81.5U Hot Switching

Spring Return.

CAUTION:

Terminals must be properly wired for correct function and full life of the

actuator.

NOTE: SSD81.5U can be wired either neutral or hot switched. For hot switching:

G = System Neutral

G0 = System Potential

Table 2. Terminal Designations.

G, G0

24 Vac Operating Voltage

System Potential

System Neutral

0 to 10 Vdc Control Signal

Output shaft extends

Output shaft retracts

Start-

Check the wiring and the position indication.

When the position indicator is in the “1” position,

the output shaft is extended.

When the position indicator is on the “0” position,

the output shaft is retracted.

Position Position

indicator at 1 indicator at 0

Actuator Stem Actuator Stem

Extended Retracted

Figure 12. Position Indicator.

NOTE:

The "1" and "0"

position markings

are intended for

reference only and

not for stroke

measurement.

Technical Instructions Pressure Independent Control

Document No. 155-773 SSD Series Electronic Valve Actuators

September 1, 2015

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

sbt_technical.editor.us.sbt@siemens.com

Document No. 155-773

Printed in the USA

Page 8

Troubleshooting Check Wiring for proper connections.

If the actuator does not provide full flow or full close-off, check that the actuator is

properly attached to the valve.

If not:

1. Turn the power off.

2. Manually retract output shaft with 3mm wrench to zero position.

3. Tighten the bonnet ring onto the valve completely.

4. Power up.

Dimensions

Figure 13. SSD Actuator Dimensions in Inches (Millimeters).

Figure 14. SSDx1.5U Actuator Dimensions in Inches (Millimeters).

Service Envelope Minimum access space recommended:

8 inches (200 mm) above the actuator and beside the terminal plug.

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