Siemens Powermite 599 MT Series Betriebsanleitung

Powermite 599

Technical Instructions

Document No. 155-313P25

EA 599-15

January 12, 2018

MT Series SSC Electronic

Valve Actuator, 24 Vac/dc

Proportional Control

Siemens Industry, Inc.

Description The Powermite 599 MT SSC61U and SSC61.5U electronic valve actuators require a

24 Vac or 24 Vdc supply and a 0 to 10 Vdc control signal. They proportionally 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 MT SSC61 series electronic actuators and MT Series valves are

used in closed loop heating and cooling applications. They control hot or chilled water

or steam (<5 psi) for convectors, fan coil units, unit conditioners, radiation, reheat coils,

and similar terminal units. The SSC61 series actuators accept a plenum cable or 3/8-

inch flex conduit connection.

Product Numbers

Table 1. Product Numbers.

Actuator Operating Mode Actuator Prefix Code

SSC61U Non-spring Return

(Fail-in-Place) 261

SSC61.5U Spring Return

(Fail-Safe) 262

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/dc Proportional Control

Document Number 155-313P25

January 12, 2018

Page 2 Siemens Industry, Inc.

Specifications

Power requirements Operating voltage 24 Vac ±20%, 24 Vdc ±20%

Frequency 50/60 Hz ±2 Hz

Power supply 24 Vdc or earth ground isolating,

Class 2, 24 Vac transformer

NOTE: Do not power more than

10 actuators with one

transformer.

SSC61U power consumption 2 VA

SSC61.5U power consumption 3 VA at ultra cap load,

2 VA at normal operation

Control characteristics Control signal (Y)

Voltage 0 to 10 Vdc (default) or 0 to 20 mA with

external 500 ohm, 0.2W resistor

Current 0.1 mA

Functional operation Running time

at 50/60 Hz 30 sec ±10%

Spring return, SSC61.5U only (Figure 1) ≈30 seconds

Nominal stroke 7/32-inch (5.5 mm)

Nominal force 67 lb (300N)

Stroke/signal relationship Linear

Capacitor charge time (Figure 1) maximum 180 seconds

Spring return (SSC61.5U only) Non-mechanical, electronic return fails

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) with

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

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

Media temperature 35°F to 230°F (2°C to 110°C)

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

Weight 0.61 lb (0.27 kg)

Dimensions See Figure 7

MT Series SSC Electronic Valve Actuator, 24 Vac/dc Proportional Control Technical Instructions

Document Number 155-313P25

January 12, 2018

Siemens Industry, Inc. Page 3

Operation The stroke of the actuator shaft is proportional to the control signal on terminal Y.

A 0 Vdc control signal retracts the shaft. In the event of a power failure with no control

voltage, the SSC61U fails-in-place and holds its last position.

In the event of a power failure, the SSC61.5U returns to the stem up position. The

SSC61.5U includes an electronic return mechanism that functions as follows (Figure 1):

•At power-up (t0), a capacitor

must charge to its maximum

capacity (Max, tc). This will take

a maximum of 180 seconds,

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) longer than 5

seconds, the capacitor

discharges (td) and the actuator

returns to its normal spring

return position.

Figure 1. SSC61.5U Electronic Spring Return

Mechanism.

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:

1. Disconnect power.

2. Turn the manual position indicator (see

Figure 5 and Figure 6)on the top of the

actuator to the 0position and verify that

the actuator shaft retracts completely.

3. Connect a valve to the actuator, and

reapply power. The actuator will return to

normal operation.

Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac/dc Proportional Control

Document Number 155-313P25

January 12, 2018

Page 4 Siemens Industry, Inc.

Operation,

Continued

Calibration Stroke

The SSC61x 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 the hole on the circuit board

with the shorting bars.

3. With power applied to the unit, insert

and gently twist a flat-blade

screwdriver to electrically connect the

shorting bars (Figure 2). The SSC61x

then performs a new calibration stroke.

4. Secure the terminal cover back in

place.

Figure 2. Manually Clearing Calibration

Stroke from Memory.

Mounting and

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

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.

Wiring 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 by one transformer. (Use 0.5 amp fuse on

secondary per actuator.)

CAUTION:

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

actuator.

MT Series SSC Electronic Valve Actuator, 24 Vac/dc Proportional Control Technical Instructions

Document Number 155-313P25

January 12, 2018

Siemens Industry, Inc. Page 5

Wiring Diagrams

Figure 4. SSC61U and SSC61.5U Wiring.

G, G0 24 Vac or 24 Vdc operating

voltage

Y 0 to 10 Vdc control signal

G0 System neutral

G System potential

R1 500 ohm resistor

(optional for 0 to 20 mA

operation)

Manual Override For manual positioning, use the

manual override knob in the

center of the position indicator,

See Figure 5.

Figure 5. Manual Override.

Start-up Check the wiring and the position indicator

(Figure 6).

Figure 6. Top View of Position Indicator

(Shown in the 0 Position).

Position Indicator Output Shaft

0Retracted

1 Extended

Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac/dc Proportional Control

Document Number 155-313P25

January 12, 2018

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 60089-4513

USA

Tel. +1-847-215-1000

Your feedback is important to us. If you have

comments about this document, please send them

tosbt_technical.editor.us.sbt@siemens.com

Document No. 155-313P25

Printed in the USA

Page 6

Troubleshooting Check the wiring for proper connections.

Service If the actuator is inoperative, replace the unit.

Disposal The device is considered electrical and electronic equipment for

disposal in terms of the applicable European Directive and may not

be disposed of as domestic garbage.

•Dispose of the device through channels provided for this

purpose.

•Comply with all local and currently applicable laws and

regulations.

Dimensions

Figure 7. SSC61 Series Actuator Dimensions in Inches (Millimeters).

Service Envelope Minimum access space recommended:

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

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