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;
or
•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
0
Retracted
1
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
mentioned herein may be the trademarks of their respective owners. © 2019 Siemens Industry, Inc.
Siemens Industry, Inc.
Smart Infrastructure
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
USA
[phone]
Your feedback is important to us. If you have
comments about this document, please send them to
[e-mail]
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.