Siemens Powermite 599 MT Series Betriebsanleitung

Powermite 599

Technical Instructions

Document No. 155-308P25

EA 599-14

March 17, 2015

MT Series SQS Electronic

Valve Actuator, 24 Vac,

Floating Control (3-position)

Siemens Industry, Inc.

Description The Powermite 599 MT Series SQS85.53U Electronic Valve Actuator requires a 24 Vac

supply and receives a floating control signal to provide three-position control. The

actuator controls Powermite 599 Series MT Series terminal unit valves with a 7/32-inch

(5.5 mm) stroke. With no control voltage or in the event of a power failure, a mechanical

spring allows the valve to return to its normal (fail-safe) position.

Features •Maintenance-free with reversible motor.

•UL listed for plenum installations.

•Floating control signal input.

•Mechanical spring returns the valve to its normal (fail-safe) position in power-off

condition.

Application For use in small to medium HVAC installations with Powermite 599 Series MT Series

terminal unit valves and Siemens Building Technologies standard valves with a

7/32-inch (5.5 mm) stroke requiring a minimum of 90 pounds force (400N). They can be

used in liquid and low pressure steam service applications.

Product Number SQS85.53U Actuator prefix code 266

Ordering

Information 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 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 SQS Electronic Valve Actuator, 24 Vac, 3-Position (Floating) Control, Fail-Safe

Document Number 155-308P25

March 17, 2015

Page 2 Siemens Industry, Inc.

Specifications

Power Requirements Operating voltage/frequency 24 Vac, ±20%, 60 Hz

Power Supply Earth ground, isolating Class 2,

24 Vac transformer

NOTE: Do not power more than 10

actuators with one transformer.

(Use 0.5 amp fuse on secondary

per actuator.)

Power consumption 5 VA

Control Characteristics Control signal Floating (3-position)

Y1 24 Vac power extends actuator shaft (0 to 1)

Y2 24 Vac power retracts actuator shaft (1 to 0)

Functional Operation Running time

at 60 Hz 30-seconds

Spring return time ≈8-seconds

Nominal stroke 7/32-inch (5.5 mm)

Nominal force 90 lb (400 N)

Fail-safe Mechanical spring

Agency Approvals UL UL listed to UL873

cUL certified to CSA C22.2 No. 24-93

Environmental

Conditions Ambient temperature

Operation 23°F to 122°F (-5°C to 50°C)

Transport and storage -13°F to 149°F (-25°C to 65°C)

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

Medium temperature 41°F to 248°F (5°C to 120°C)

Physical Characteristics

Conduit opening Knockouts for standard 1/2-inch (12.7 mm)

conduit connector

Weight 1.3 lb (0.6 kg)

Dimensions See Figure 3.

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

SQS Electronic Valve Actuator, 24 Vac, 3-Position (Floating) Control, Fail-Safe Technical Instructions

Document Number 155-308P25

March 17, 2015

Siemens Industry, Inc. Page 3

Operation A 24 Vac control signal to Y1 extends the actuator shaft proportionately to the length of

time the signal is applied.

A 24 Vac control signal to Y2 retracts the actuator shaft proportionately to the length of

time the signal is applied.

In the event of a power failure, the SQS85.53U actuator returns the valve to its normal

(spring return) position.

Mounting and

Installation Mount the actuator in any position except with the actuator lower than the valve.

Figure 1. Mounting Positions.

Wiring Use earth ground isolating, step-down Class 2 power supplies. Do not use auto

transformers.

Determine supply transformer minimum rating by summing total equipment on circuit.

The maximum rating for Class 2 step-down transformers is 100 VA.

Do not power more than 10 actuators with one transformer. (Use 0.5 amp fuse on

secondary per actuator.)

WARNING:

Housing rated for flex conduit only.

Technical Instructions SQS Electronic Valve Actuator, 24 Vac, 3-Position (Floating) Control, Fail-Safe

Document Number 155-308P25

March 17, 2015

Page 4 Siemens Industry, Inc.

Wiring Diagrams

CAUTION:

Terminals G and 21 must be properly wired for correct function and full

life of the actuator.

If the actuator makes a buzzing noise upon reaching setpoint, G and 21

are improperly wired and should be reversed.

G, 21 24 Vac operating voltage

G = System neutral

21 = System potential

Y1 Extends actuator shaft

Y2 Retracts actuator shaft

Figure 2. SQS85.53U Terminal Connections.

Start-Up The valve body assembly determines the action of the complete valve/actuator

assembly as follows:

Normally Closed Valve:

•When the actuator shaft extends, the valve opens (0 to 1).

•When the actuator shaft retracts, the valve closes (1 to 0).

Normally Open Valve:

•When the actuator shaft extends, the valve closes (0 to 1).

•When the actuator shaft retracts, the valve opens (1 to 0).

Three-Way Valve:

•When the actuator shaft extends (0 to 1), the valve opens between

port A and AB.

•When the actuator shaft retracts (1 to 0), the valve opens between

port B and BA.

SQS Electronic Valve Actuator, 24 Vac, 3-Position (Floating) Control, Fail-Safe Technical Instructions

Document Number 155-308P25

March 17, 2015

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

USA

+ 1 847-215-1000

Your feedback is important to us. If you have

comments about this document, please send them

to sbt_technical.editor.us.s[email protected]

Document No. 155-308P25

Printed in the USA

Page 5

Troubleshooting Check wiring for proper connections and secure attachments.

Check for adequate power supply.

Dimensions

Figure 3. Dimensions of the SQS85.53U Actuator.

Dimensions shown in Inches (Millimeters).

Service Envelope Minimum access space recommended

4 inches (100 mm) 8 inches (200 mm)

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