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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.

Summary of content (6 pages)

PAGE 1
Technical Instructions Document No. 155-313P25 EA 599-15 January 12, 2018 Powermite 599 MT Series SSC Electronic Valve Actuator, 24 Vac/dc Proportional Control Description Features Application 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.
PAGE 2
Technical Instructions Document Number 155-313P25 January 12, 2018 MT Series SSC Electronic Valve Actuator, 24 Vac/dc Proportional Control Specifications Power requirements Operating voltage Frequency Power supply SSC61U power consumption SSC61.5U power consumption Control characteristics Functional operation Control signal (Y) Voltage Current Running time at 50/60 Hz Spring return, SSC61.
PAGE 3
MT Series SSC Electronic Valve Actuator, 24 Vac/dc Proportional Control Operation Technical Instructions Document Number 155-313P25 January 12, 2018 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.
PAGE 4
Technical Instructions Document Number 155-313P25 January 12, 2018 Operation, Continued Calibration Stroke MT Series SSC Electronic Valve Actuator, 24 Vac/dc Proportional Control 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.
PAGE 5
MT Series SSC Electronic Valve Actuator, 24 Vac/dc Proportional Control Technical Instructions Document Number 155-313P25 January 12, 2018 Wiring Diagrams 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) Figure 4. SSC61U and SSC61.5U Wiring. Manual Override For manual positioning, use the manual override knob in the center of the position indicator, See Figure 5. Figure 5.
PAGE 6
Technical Instructions Document Number 155-313P25 January 12, 2018 MT Series SSC Electronic Valve Actuator, 24 Vac/dc Proportional Control 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.