Data Sheet for Product

ManualsBrandsSiemens ManualsControl Valves3/4" 3-Way FNPT Non-Spring Return Mixing Valve Actuator Assembly 6.3 Cv

Powermite™ 599

Technical Instructions

Document No. 155-314P25

EA 599-16

May 8, 2019

MT Series SSC Electronic

Valve Actuator, 24 Vac

Floating Control

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

(<5 psi) 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.

Summary of content (7 pages)

PAGE 1
Technical Instructions Document No. 155-314P25 EA 599-16 May 8, 2019 Powermite™ 599 MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control 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.
PAGE 2
Technical Instructions Document Number 155-314P25 May 8, 2019 MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control 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.
PAGE 3
MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control Operation Technical Instructions Document Number 155-314P25 May 8, 2019 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.
PAGE 4
Technical Instructions Document Number 155-314P25 May 8, 2019 Calibration Stroke MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control 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.
PAGE 5
MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control Technical Instructions Document Number 155-314P25 May 8, 2019 Wiring Diagrams Figure 4. SSC81U Neutral Switching Non-Spring Return. Y2 Y1 G G0 Figure 6. SSC81U Hot Switching Non-Spring Return. Siemens Industry, Inc. Figure 5. SSC81.5U Neutral Switching Spring Return. Retracts actuator shaft Extends actuator shaft System potential (hot) Neutral – (SSC81.5U Only) Figure 7. SSC81.5U Hot Switching Spring Return.
PAGE 6
Technical Instructions Document Number 155-314P25 May 8, 2019 Manual Override MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control For manual positioning, the override knob is in the center of the position indicator. See Figure 9. Figure 9. Manual Override. Start-up Check the wiring and the position indicator. See Figure 10. Position Indicator Output Shaft 0 Retracted 1 Extended Figure 10. Position Indicator (Shown in the 0 Position).
PAGE 7
MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control Technical Instructions Document Number 155-314P25 May 8, 2019 Dimensions Figure 11. 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. Information in this publication is based on current specifications.