Siemens MT Series Owner's manual

Powermite 599

Technical Instructions

Document No. 155-314P25

EA 599-16

May 10, 2011

MT Series SSC Electronic

Valve Actuator, 24 Vac

Floating Control

EA1157R1

Siemens Industry, Inc.

Description The Powermite 599 MT Series SSC81U and SSC81.5U electronic valve actuators

require a 24 Vac supply to provide a floating control signal. These actuators control

Powermite 599 MT Series valves with a 7/32-inch (5.5 mm) stroke and a threaded

valve bonnet that fits the actuators.

Features •UL listed for plenum installations

•Direct-coupled installation without special tools (hand-tightened)

•Manual override

•Visual position indication

Application The Powermite 599 MT Series SSC81 electronic actuators and MT Series valves are

used in heating and cooling applications. They are used in liquid and steam

applications. The SSC81 series accepts plenum cable or 3/8-inch flex conduit

connection.

Product Numbers Table 1. Product Numbers.

Actuator Operating Mode

Actuator Prefix

Code

SSC81U Non-Spring Return

(Fail-in-Place) 259

SSC81.5U Spring Return

(Fail-Safe) 260

Ordering a Valve

Plus Actuator

Assembly

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

actuator prefix code with the suffix of the valve product number. See Technical Bulletin

TB251, Powermite 599 Series MT Series Terminal Unit Valve and Actuator Assembly

Selection (155-306P25) for selection procedures.

To order an actuator only, use the product number.

Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control

Document Number 155-314P25

May 10, 2011

Page 2 Siemens Industry, Inc.

Warning/Caution Notations

WARNING: Personal injury or loss of life may occur if you do not perform

a procedure as specified.

CAUTION: Equipment damage may occur if you do not follow a

procedure as specified.

Specifications

Power requirements

Operating voltage 24 Vac ±20%

Frequency 50/60 Hz ±2 Hz

Power supply Earth ground isolating, Class 2,

24 Vac transformer

NOTE: Do not power more than

10 actuators with one

transformer.

SSC81U power consumption 0.8 VA

SSC81.5U power consumption 3 VA at ultra cap load,

2 VA at normal operation

Running time

SSC81U 125 s ±2% at 60 Hz

SSC81.5U 125 s ±2% at 50/60 Hz

Functional operation

Spring return, SSC81.5U only (Figure 1, ) ≈30 s

Nominal stroke 7/32-inch (5.5 mm)

Nominal force 67 lb (300N)

Stroke/signal relationship Linear

Capacitor charge time (Figure 1 ) max. 180 sec

Spring return (SSC81.5U only) Non-mechanical, electronic returns

to stem up (0 position)

Agency certification UL UL873 Listed

cUL Certified to CSA

C22.2 No. 24-93

Ambient conditions Ambient temperature

Operation 41°F to 122°F (5°C to 50°C)

Transport and storage -13°F to 158°F (-25°C to +70°C)

Ambient humidity 0 to 90% rh (non-condensing)

Media temperature 41°F to 248°F (5°C to 120°C)

Physical characteristics Wiring Connection Plenum cable or 3/8-inch flex conduit

Weight

SSC81U 1.1 lb (0.5 kg)

SSC81.5U 1.3 lb (0.6 kg)

Dimensions See

Figure 10

MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control Technical Instructions

Document Number 155-314P25

May 10, 2011

Siemens Industry, Inc. Page 3

Service Kits

EA1156R1

EA1162R1

EA0851R1

EA1138R1

411555648 For actuators with date

codes of 031215F or later.

Kit contains:

- Terminal cover

- Cover screws-2 (not shown)

- Tailpiece

- Tailpiece screw-1 (not shown)

- Cable lock

- Terminal block-3

EA0850R1

EA0851R1

411656088 For actuators with date

codes before 031215F.

Kit contains:

- Terminal Cover

- Cable lock

- Cover screw- 1 (not shown)

Operation 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 SSC81U

will hold its last position.

In the event of a power failure, the SSC81.5U returns to the stem up 0 position. The

SSC81.5U includes an electronic return mechanism that functions as follows. See

Figure 1.

•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.

EA0798R2

TIME

MAX

180s. MAX

30s.

CHARGE

Max

NORMAL

ACTUATOR

OPERATION

ACTUATOR

POSITION

TIME TO

DISCHARGE

TIME TO

CHARGE

t0 tctntd

Figure 1. SSC81.5U Electronic Spring

Return Mechanism.

Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control

Document Number 155-314P25

May 10, 2011

Page 4 Siemens Industry, Inc.

Operation, Continued 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 8 and Figure 9)on

the top of the actuator to the 0 position and verify the actuator

shaft completely retracts.

3. Connect a valve to the actuator, reapply power. The actuator will

return to normal operation.

Calibration Stroke The SSC81.5U 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 (Figure 2). The SSC81…

then performs a new calibration stroke.

4. Secure the terminal cover back in place.

EA1155R1

WIRING TERMINAL

WITH REMOVABLE

TERMINAL BLOCK

Shorting

Bars

TERMINAL

COVER

AND SCREWS

Figure 2. Manually Clearing Calibration

Stroke from Memory.

Mounting and

Installation Mount the actuator in one of the allowable positions shown in Figure 3.

EA0791R2

Figure 3. Mounting Position.

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.

MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control Technical Instructions

Document Number 155-314P25

May 10, 2011

Siemens Industry, Inc. Page 5

Wiring Use earth ground isolating, step-down Class 2 transformers. Do not use

autotransformers.

Determine supply transformer rating by summing 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 by one transformer. (Use 0.5 amp fuse on

secondary actuator.)

NOTE: Can be wired either neutral or hot switched.

CAUTION:

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

actuator.

Wiring Diagrams

NEUT

CONTROLLER ACTUATOR

EARTH GROUND

ISOLATING CLASS 2

TRANSFORMER FOR

24 Vac POWER

120 Vac

Vac

EA0795R1

Figure 4. SSC81U Neutral Switching

Non-Spring Return.

EA1234R1

NEUT

CONTROLLER

EARTH GROUND

ISOLATING CLASS 2

24 Vac TRANSFORMER

120 Vac

24 Vac

ACTUATOR

Figure 5. SSC81.5U Neutral Switching

Spring Return.

Y2 Retracts actuator shaft

Y1 Extends actuator shaft

G System potential (hot)

G0 Neutral – (SSC81.5U Only)

NEUT

EARTH GROUND

ISOLATING CLASS 2

TRANSFORMER FOR

24Vac POWER

120Vac

Vac

EA0585R1

Figure 6. SSC81U Hot Switching

Non-Spring Return.

EA1235R1

NEUT

CONTROLLER

EARTH GROUND

ISOLATING CLASS 2

24 Vac TRANSFORMER

120 Vac

24 Vac

ACTUATOR

Figure 7. SSC81.5U Hot Switching

Spring Return.

Y2 Retracts actuator shaft

Y1 Extends actuator shaft

G Neutral

G0 System potential (hot) -SSC81.5U Only

Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control

Document Number 155-314P25

May 10, 2011

Page 6 Siemens Industry, Inc.

Manual Override For manual positioning, the override knob is

in the center of the position indicator. See

Figure 8.

CLOCKWISE

EXTENDS

SHAFT

COUNTER

CLOCKWISE

RETRACTS

SHAFT

EA1161R1

Figure 8. Manual Override.

Start-up Check the wiring and the position indicator

(Figure 9).

Position Indicator Output Shaft

0 Retracted

1 Extended

EA1158R1

Figure 9. Position Indicator

(Shown in 0 Position).

Troubleshooting Check the wiring for proper connections.

Service Kits If the actuator is inoperative, replace the unit.

MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control Technical Instructions

Document Number 155-314P25

May 10, 2011

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 the trademarks of their respective owners.

Siemens Industry, Inc.

Building Technologies Division

1000 Deerfield Parkway

Buffalo Grove, IL 60089

USA

+ 1 847-215-1000

Your feedback is important to us. If you have comments

about this document, please send them to

[email protected]

Dimensions

(48)

4.4

(110,8)

3.5

(89)

.85

(21,6)

4.5

(115,1) 5.5

(140)

EA1159R1

Figure 10. SSC Actuator Dimensions in Inches (Millimeters).

Service envelope Minimum access space recommended:

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

cover.

Document No. 155-314P25

Printed in the USA

Page 7

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