Schneider Electric MT Series SSC Electronic Installation Instructions

Technical Instructions

Document No. 155-314P25

EA 599-16

May 10, 2011

Powermite 599

MT Series SSC Electronic

Valve Actuator, 24 Vac

Floating Control

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Description

Features

Application

Product Numbers

Ordering a Valve

Plus Actuator

Assembly

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.

•UL listed for plenum installations

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

•Manual override

•Visual position indication

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.

Table 1. Product Numbers.

	Actuator	Operating Mode	Actuator Prefix
			Code
	SSC81U	Non-Spring Return	259
		(Fail-in-Place)
	SSC81.5U	Spring Return	260
		(Fail-Safe)

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 Industry, Inc.

Technical Instructions	MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control
Document Number 155-314P25
May 10, 2011

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

Functional operation

Agency certification

Ambient conditions

Physical characteristics

Operating voltage

Frequency

Power supply

SSC81U power consumption

SSC81.5U power consumption

Running time SSC81U SSC81.5U

Spring return, SSC81.5U only (Figure 1, ) Nominal stroke

Nominal force Stroke/signal relationship

Capacitor charge time (Figure 1 ) Spring return (SSC81.5U only)

UL cUL

Ambient temperature

Operation

Transport and storage

Ambient humidity

Media temperature

Wiring Connection

Weight

SSC81U

SSC81.5U

Dimensions

24 Vac ±20%

50/60 Hz ±2 Hz

Earth ground isolating, Class 2, 24 Vac transformer

NOTE: Do not power more than 10 actuators with one transformer.

0.8 VA

3 VA at ultra cap load,

2 VA at normal operation

125 s ±2% at 60 Hz

125s ±2% at 50/60 Hz

≈30 s

7/32-inch (5.5 mm) 67 lb (300N) Linear

max. 180 sec

Non-mechanical, electronic returns to stem up (0 position)

UL873 Listed

Certified to CSA C22.2 No. 24-93

41°F to 122°F (5°C to 50°C) -13°F to 158°F (-25°C to +70°C)

0 to 90% rh (non-condensing) 41°F to 248°F (5°C to 120°C)

Plenum cable or 3/8-inch flex conduit

1.1 lb (0.5 kg)

1.3 lb (0.6 kg) See Figure 10

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Siemens Industry, Inc.

MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control	Technical Instructions
	Document Number 155-314P25
	May 10, 2011

Service Kits

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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

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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.

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			CHARGE			ACTUATOR	DISCHARGE			<![if ! IE]> <![endif]>ACTUATOR POSITION
	Max					OPERATION
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			180s.					30s.
	t0				tc	TIME	tn		td
			MAX
								MAX

Figure 1. SSC81.5U Electronic Spring

Return Mechanism.

Siemens Industry, Inc.

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