Siemens Powermite 599 Series Owner's manual

Powermite 599 Series

Technical Instructions

Document No. 155-314P25

EA 599-16

May 24, 2005

MT Series SSC Electronic

Valve Actuator, 24 Vac

3-Position (Floating) Control

EA1157R1

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

actuators require a 24 Vac supply to provide a 3-position (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

• Manual override

• Visual position indication

Application The Powermite 599 Series MT Series SSC81… electronic actuators and MT Series

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

applications that require an actuator that delivers a minimum of 67 lbs (300 N) nominal

force. 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 Fail-in-Place 259

SSC81.5U 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.

Siemens Building Technologies, Inc.

Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac 3-Position (Floating) Control

Document Number 155-314P25

May 24, 2005

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 drift

Control characteristic Control Signal

Y2 Retracts actuator shaft

Y1 Extends actuator shaft

G System potential

G0 (SSC81.5U only) System neutral

Functional operation Running time

SSC81U 150 s ±2% at 50 Hz

125 s ±2% at 60 Hz

SSC81.5U 125 s ±2% at 50/60 Hz

Fail-safe, SSC81.5U only (Figure 1, ) ≈30 s

Nominal stroke 7/32-inch (5.5 mm)

Nominal force 67 lb (300N), +20%, -0%

Stroke/signal relationship Linear

Capacitor charge time (Figure 1 ) max. 180 sec

Fail-safe (SSC81.5U only) Non-mechanical, electronic return fails

to stem up (0 position)

Agency certification UL UL873 Listed

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) with

15 psi steam media

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

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

Medium 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 8

Page 2 Siemens Building Technologies, Inc.

MT Series SSC Electronic Valve Actuator, 24 Vac 3-Position (Floating) Control Technical Instructions

Document Number 155-314P25

May 24, 2005

Service Kits

EA0847R1

3mm

4 224 5618 8 Visual Position Kit to

replace one indicator and two gears.

(Previous version.)

EA1156R1

EA1162R1

EA0851R1

EA1138R1

4-115-5564-8: Kit contains:

- Terminal cover

- Cover screws-2 (not shown)

- Tailpiece

- Tailpiece screw-1 (not shown)

- Cable lock

- Terminal block-3

EA0850R1

EA0851R1

4-116-5608-8: 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 SSC81U fails-in-place and

holds its last position.

In the event of a power failure, the SSC81.5U returns to its normal fail-safe 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 sec, the

capacitor discharges (td) and the

actuator returns to its normal fail-safe

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 Fail-Safe

Mechanism.

Siemens Building Technologies, Inc. Page 3

Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac 3-Position (Floating) Control

Document Number 155-314P25

May 24, 2005

Operation, Continued

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, turn the manual position indicator (See Figure 6 and

Figure 7)on the top of the actuator to the 0 position and verify the

actuator shaft retracts completely. Disconnect power. Connect a valve

to the actuator, reapply power, and 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

WIRINGTERMINAL

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.

Page 4 Siemens Building Technologies, Inc.

MT Series SSC Electronic Valve Actuator, 24 Vac 3-Position (Floating) Control Technical Instructions

Document Number 155-314P25

May 24, 2005

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.

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

Y2…Retracts actuator shaft

Y1…Extends actuator shaft

G…System potential

Figure 4. SSC81U (Fail-in-Place)

Wiring.

EA0796R3

NEUT

CONTROLLER

EARTH GROUND

ISOLATING CLASS 2

24VacTRANSFORMER

120Vac

24Vac

ACTUATOR

Y2…Retracts actuator shaft

Y1…Extends actuator shaft

G… System potential

G0…System neutral

Figure 5. SSC81.5U (Fail-Safe) Wiring.

Manual Override For manual positioning, the manual

override knob in the center of the position

indicator per Figure 6.

CLOCKWISE

EXTENDS

SHAFT

COUNTER

CLOCKWISE

RETRACTS

SHAFT

EA1161R1

Figure 6. Manual Override.

Siemens Building Technologies, Inc. Page 5

Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac 3-Position (Floating) Control

Document Number 155-314P25

May 24, 2005

Start-up Check the wiring and the position indicator

(Figure 7).

Position Indicator Output Shaft

0 Retracted

1 Extended

EA1158R1

Figure 7. Position Indicator

(Shown in 0 Position).

Troubleshooting Check the wiring for proper connections.

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

Dimensions

(48)

4.4

(110,8)

3.5

(89)

.85

(21,6)

4.5

(115,1) 5.5

(140)

EA1159R1

Figure 8. SSC Actuator Dimensions in Inches (Millimeters).

Service envelope Minimum access space recommended:

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

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. Other product or company names mentioned herein may be the trademarks of their respective owners.

Siemens Building Technologies, Inc.

1000 Deerfield Parkway Your feedback is important to us. If you have

comments about this document, please send

Buffalo Grove, IL 60089-4513

U.S.A. them to [email protected] Page 6

Document No. 155-314P25

Country of Origin: US

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