Belimo SRF24A-SR Instruction Manual

Technical data sheet SRF24A-SR

Modulating rotary actuator with

emergency control function for ball

valves

• Nominaltorque20Nm

• NominalvoltageAC/DC24V

• ControlModulatingDC(0)2...10V

• PositionfeedbackDC2...10V

• Deenergisedclosed(NC)

Technical data

Electrical data Nominal voltage AC/DC 24 V

Nominal voltage frequency 50/60 Hz

Nominal voltage range AC 19.2...28.8 V / DC 21.6...28.8 V

Power consumption in operation 5.5 W

Power consumption in rest position 3 W

Power consumption for wire sizing 8.5 VA

Connection supply / control Cable 1 m, 4 x 0.75 mm²

Parallel operation Yes (note the performance data)

Functional data Torque motor Min. 20 Nm

Torque spring return Min. 20 Nm

Positioning signal Y DC 0...10 V

Positioning signal Y note Input impedance 100 kΩ

Operating range Y DC 2...10 V

Position feedback U DC 2...10 V

Position feedback U note Max. 0.5 mA

Position accuracy ±5%

Direction of rotation motor Y=0 (0V = A-AB = 0%)

Direction of rotation spring-return Deenergised NC, valve closed (A - AB = 0%)

Manual override By means of hand crank and locking switch

Angle of rotation 90°

Running time motor 90 s / 90°

Running time emergency setting position <20 s / 90°

Sound power level motor max. 45 dB(A)

Position indication Mechanical

Service life Min. 60,000 emergency positions

Safety Protection class IEC/EN III Safety extra-low voltage

Protection class UL UL Class 2 Supply

Degree of protection IEC/EN IP54

Degree of protection NEMA/UL NEMA 2, UL Enclosure Type 2

EMC CE according to 2004/108/EC

Certification IEC/EN IEC/EN 60730-1 and IEC/EN 60730-2-14

Certification UL cULus according to UL 60730-1A, UL 60730-2-

14 and CAN/CSA E60730-1:02

Mode of operation Type 1.AA

Rated impulse voltage supply / control 0.8 kV

Control pollution degree 3

Ambient temperature -30...50°C

Non-operating temperature -40...80°C

Ambient humidity 95% r.h., non-condensing

Maintenance Maintenance-free

Weight Weight approx. 2.2 kg

Safety notes

• This device has been designed for use in stationary heating, ventilation and air

conditioning systems and is not allowed to be used outside the specified field of

application, especially in aircraft or in any other airborne means of transport.

www.belimo.eu SRF24A-SR • en-gb • 2014-10-15 • subject to changes 1

• Only authorised specialists may carry out installation. All applicable legal or

institutional installation regulations must be complied during installation.

• The device may only be opened at the manufacturer‘s site. It does not contain any

parts that can be replaced or repaired by the user.

• The cables must not be removed from the device.

• The device contains electrical and electronic components and is not allowed to be

disposed of as household refuse. All locally valid regulations and requirements must

be observed.

Productfeatures

Mode of operation The actuator is connected with a standard modulating signal DC 0...10 V. The actuator

moves the valve to the operating position at the same time as tensioning the return

spring. The valve is turned back to the emergency position by spring force when the

supply voltage is interrupted.

Directmounting Simple direct mounting on the ball valve with only one screw. The mounting orientation

in relation to the ball valve can be selected in 90° steps.

Manual override Manual actuation of the valve with manual elevator crank, engagement with the locking

switch at any position. Unlocking is manual or automatic by applying the operating

voltage.

High functional reliability The actuator is overload protected, requires no limit switches and automatically stops

when the end stop is reached.

Adjustable angle of rotation Adjustable angle of rotation with mechanical end stop.

Electrical installation

Notes • Connection via safety isolating transformer.

• Parallel connection of other actuators possible. Observe the performance data.

Wiring diagrams

AC/DC 24 V, modulating

A – AB = 0%

Y=0

1 32 5

–

DC (0)2…10 V

DC 2…10 V

Cablecolours:

1 = black

2 = red

3 = white

5 = orange

SRF24A-SR Rotaryspring-returnactuator,Modulating,AC/DC24V,

20Nm

Safety notes

www.belimo.eu

SRF24A-SR • en-gb • 2014-10-15 • subject to changes

Dimensionaldrawings

162

172

182

244

103

101

Further documentation

•Overview Valve-actuator combinations

• Data sheets for ball valves

• Installation instructions for actuators and/or ball valves

• General notes for project planning

SRF24A-SR Rotaryspring-returnactuator,Modulating,AC/DC24V,

20Nm

Dimensions[mm]

www.belimo.eu SRF24A-SR • en-gb • 2014-10-15 • subject to changes 3

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