Siemens SSC Series User manual

Installation Instructions

Document No. 129-253

May 8, 2019

SSC Series Electronic Valve Actuator

Item Number 129-253-07, Rev. FA Page 1 of 5

Product Description

The SSC series actuator requires a 24 Vac, Class 2

supply and provides a 0 to 10 Vdc or Floating (three-

position) control signal. The actuator controls a

Powermite™599 Series MT Series valve with a

7/32-inch (5.5-mm) stroke.

Warning /Caution Notations

WARNING:

Personal injury or loss of life

may occur if you do not

perform a procedure as

specified.

CAUTION:

Equipment damage or loss of

data may occur if you do not

follow a procedure as

specified.

Product Numbers

SSC61U 0 to 10 Vdc, proportional control,

non-spring return (fail-in-place)

SSC61.5U 0 to 10 Vdc, proportional control,

spring return (fail-safe)

SSC81U Floating control, non-spring return

(fail-in-place)

SSC81.5U Floating control, spring return

(fail-safe)

Contents

One SSC actuator

Estimated Installation Time

20 minutes

Required Tools

•Small Phillips head screwdriver

•Small flat-blade screwdriver

•Wire stripper

Prerequisites

WARNING:

1. If mounting the actuator to a valve already

in line, either close the shut-off in the

piping (upstream first, then downstream) or

switch off the pump to allow the differential

pressure in the valve to drop.

2. Disconnect the controller power before

replacing the actuator.

3. If high voltage cable is co-located with the

SSC actuator, conduit or shielded wire may

need to be used.

CAUTION:

Before applying power, make certain a valve is

connected to the actuator.

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, disconnect the power. Turn the

manual position indicator on the top of the

actuator to the 0position and verify the actuator

shaft retracts completely. See Figure 4.

Connect a valve to the actuator and reapply the

power. The actuator will return to normal

operation.

Mounting

The vertical position is recommended for mounting

the actuator. See Figure 1.

Figure 1.

Acceptable Actuator Mounting Positions.

CAUTION:

Mount actuator at a 45° angle from vertical when

using on low pressure steam systems to reduce

radiant heat that can damage the actuator.

Document No. 129-253

Installation Instructions

May 8, 2019

Page 2 of 5 Siemens Industry, Inc.

Installation

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

the instructions Mounting an Actuator on a Valve.

Removing the actuator from a valve

1. Remove the terminal cover (Figure 2) using a Phillips

head screwdriver.

2. Identify and disconnect wiring from the terminals.

3. Remove wiring retention screw.

4. Do one of the following:

•Remove plenum cable adapter and plenum cable;

•Remove flex conduit.

5. Loosen the actuator coupling on the valve (Figure 3,

reverse No. 2).

6. Remove the actuator from the valve.

Figure 2. SSC Actuator Components.

Mounting an Actuator on a Valve

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

remove the protective plastic cap from the valve

stem.

2. Turn the manual position indicator on the top of the

actuator to the 0position (Figure 11).

3. Using a Phillips head screwdriver, remove the

terminal cover (Figure 2).

4. Remove wiring retention screw.

5. Remove plenum cable adapter.

6. For plenum applications, complete wiring as follows:

a. Route cable through plenum cable adapter so

there is sufficient cable to complete wiring

terminations.

b. Insert plenum cable adapter into flex conduit

adapter and secure in place with wiring retention

screw.

NOTE: Insert wiring retention screw in hole of the flex

conduit adapter. (The hole nearest the wiring

terminals is to secure the terminal cover in

place.)

c. Continue with Step 8.

7. For 3/8-inch flex conduit applications, complete

wiring as follows:

a. Discard plenum cable adapter.

b. Insert flex conduit into flex conduit adapter and

secure in place with wiring retention screw.

NOTE: Insert wiring retention screw in hole

of the flex conduit adapter. (The hole

nearest the wiring terminals is to

secure the terminal cover in place.)

c. Route wiring through flex conduit for wiring

terminations.

8. Connect wires to wiring terminals per the Wiring

section of this document.

9. Secure the terminal cover in place over the wiring

terminals (Figure 2) using a Phillips head

screwdriver,

10. Place the actuator on the valve and firmly hand-

tighten (Figure 3).

CAUTION:

Hand-tighten the actuator to the valve. Using

tools to tighten the assembly together, will

cause damage.

The installation is complete.

Figure 3. Coupling Actuator to Valve.

Manual Override

To position the actuator manually, use the manual

override knob in the center of the position indicator

(Figure 4).

Figure 4. Manual Override.

Document No. 129-253

Installation Instructions

May 8, 2019

Siemens Industry, Inc. Page 3 of 5

Calibration Stroke

The SSC Series writes its calibration stroke parameters to

nonvolatile memory on the first start-up of the actuator.

Successive start-ups 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 with the shorting bars

(Figure 5).

3. With power applied to the unit, insert and gently twist

a flat-blade screwdriver to electrically connect the

shorting bars. The SSC… then performs a new

calibration stroke.

4. Secure the terminal cover back in place.

Figure 5. Manually Clearing Calibration Stroke from

SSC61U and SSC61.5U Nonvolatile Memory.

Wiring

•All wiring must conform to NEC and local codes and

regulations.

•Use earth ground isolating, step-down Class 2

transformers. Do not use autotransformers.

•Determine the supply transformer rating by summing

the total VA of all actuators used. The maximum rating

for a Class 2 step-down transformer is 100 VA.

•Do not power more than 10 actuators with one

transformer. (Use 0.5 amp on secondary actuators.)

Y2: Retracts actuator shaft

Y1: Extends actuator shaft

G: System potential

Figure 6. SSC81U NSR Floating Control.

Figure 7.

For Non-Triac Driven

Controllers.

Figure 8

For Triac Driven Controllers,

(TEC, DXR, and Others).

SSC81.5U Floating Control SR Hot-Switch.

G, G0: 24 Vac Y1 Extends actuator shaft

operating voltage G System neutral

Y2: Retracts actuator shaft G0 System potential (switched)

CAUTION:

Terminals must be properly wired for

correct function and full life of the actuator.

Because the triacs on TECs and DXRs

always switch hot power, add a 1000 Ohm

2-Watt resistor across each of the binary

(Y1, Y2) outputs (see Error! Reference

source not found.). The two resistors

must be used for all hot-switching triacs not

just TEC and DXR.

G, G0: 24 Vac operating

voltage

Y2: Retracts actuator shaft

Y1: Extends actuator shaft

G: System potential

G0: System neutral

(switched)

Figure 9. SSC81.5U Floating Control SR Neutral

Switching Applications.

NOTE: For proper operation, it is recommended no

more than three actuators be assigned to any

single control signal.

Document No. 129-253

Installation Instructions

May 8, 2019

Page 4 of 5Siemens Industry, Inc.

G, G0: 24 Vac operating

voltage

Y: *0 to 10 Vdc control

signal

G: System potential

G0: System neutral

R1: 500 ohm resistor

(optional for 0-20 mA

operation)

Figure 10.

SSC61U, NSR and SSC61.5U, SR,

0 to 10 Vdc Proportional Control Wiring Diagram.

Start-up

Check the wiring and the position indicator (Figure 11).

Position

Indicator

Output

Shaft

Retracted

Extended

NOTE:

0and 1markings are

intended for reference only,

and not stroke

measurement.

Figure 11. Position Indicator (Shown in 0 Position).

Troubleshooting

Check the wiring for the proper connections.

References

Technical Instructions

Document No.

EA 599-15 Powermite 599 Series SSC

Electronic Valve Actuator 24 Vac

Proportional Control

155-313P25

EA 599-16 Powermite 599 Series SSC

Electronic Valve Actuator

3-position (Floating) Control

155-314P25

TB251, Powermite 599 Series, MT Series

Terminal Unit Valve and Actuator Assembly

Selection

155-306P25

*4 to 20 mA with optional

resistor

Document No. 129-253

Installation Instructions

May 8, 2019

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. Powermite is a trademark of Siemens Industry, Inc. Other product or company names

Siemens Industry, Inc.

Smart Infrastructure

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. 129-253

Printed in the USA

Page 5of 5

Dimensions

Figure 12. SSC Actuator Dimensions in Inches (Millimeters).

Service Envelope

Minimum access space

recommended:

1. 8 inches (200 mm)

above the actuator.

2. 8 inches (200 mm)

beside the terminal

cover.

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