Belimo SM24A-S Instruction Manual

Technical data sheet SM24A-S
www.belimo.com SM24A-S • en-gb • 2022-07-18 • Subject to change 1 / 4
Damper actuator for adjusting dampers in
technical building installations
• Air damper size up to approx.4m²
• Torque motor20Nm
• Nominal voltageAC/DC24V
• ControlOpen/close, 3-point
• with integrated auxiliary switch
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19.2...28.8V
Power consumption in operation 2 W
Power consumption in rest position 0.2 W
Power consumption for wire sizing 4 VA
Auxiliary switch 1 x SPDT, 0...100%
Switching capacity auxiliary switch 1 mA...3 A (0.5 A inductive), AC 250 V
Connection supply / control Cable 1m, 3 x 0.75mm²
Connection auxiliary switch Cable 1m, 3 x 0.75mm²
Parallel operation Yes (note the performance data)
Functional data Torque motor 20Nm
Direction of motion motor selectable with switch 0(ccw rotation) / 1(cw
rotation)
Manual override with push-button, can be locked
Angle of rotation Max.95°
Angle of rotation note can be limited on both sides with adjustable
mechanical end stops
Running time motor 150s / 90°
Sound power level, motor 45dB(A)
Mechanical interface Universal shaft clamp reversible 10...20mm
Position indication Mechanically, pluggable
Safety data Protection class IEC/EN III, Safety Extra-Low Voltage (SELV)
Power source UL Class 2 Supply
Protection class auxiliary switch IEC/EN II, reinforced insulation
Degree of protection IEC/EN IP54
Degree of protection NEMA/UL NEMA2
Enclosure ULEnclosureType2
EMC CE according to 2014/30/EU
Low voltage directive CE according to 2014/35/EU
Certification IEC/EN IEC/EN60730-1 and IEC/EN60730-2-14
UL Approval cULus according to UL60730-1A, UL60730-2-14
and CAN/CSAE60730-1
The UL marking on the actuator depends on
the production site, the device is UL-compliant
in any case
Mode of operation Type 1.B
Rated impulse voltage supply / control 0.8kV
Rated impulse voltage auxiliary switch 2.5kV
Pollution degree 3

Technical data sheet SM24A-S
www.belimo.com SM24A-S • en-gb • 2022-07-18 • Subject to change 2 / 4
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Simple direct mounting
Manual override
Adjustable angle of rotation
High functional reliability
Flexible signalling
Safety data Ambient humidity Max. 95% RH, non-condensing
Ambient temperature -30...50°C [-22...122°F]
Storage temperature -40...80°C [-40...176°F]
Servicing maintenance-free
Weight Weight 1.0kg
   
Safety notes
This device has been designed for use in stationary heating, ventilation and air-conditioning
systems and must not be used outside the specified field of application, especially in aircraft or
in any other airborne means of transport.
Outdoor application: only possible in case that no (sea) water, snow, ice, insolation or
aggressive gases interfere directly with the device and that it is ensured that the ambient
conditions remain within the thresholds according to the data sheet at any time.
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.
Cables must not be removed from the device.
To calculate the torque required, the specifications supplied by the damper manufacturers
concerning the cross-section, the design, the installation situation and the ventilation
conditions must be observed.
The device contains electrical and electronic components and must not be disposed of as
household refuse. All locally valid regulations and requirements must be observed.
Product features
Simple direct mounting on the damper shaft with a universal shaft clamp, supplied with an anti-
rotation device to prevent the actuator from rotating.
Manual override with push-button possible (the gear train is disengaged for as long as the
button is pressed or remains locked).
Adjustable angle of rotation with mechanical end stops.
The actuator is overload protected, requires no limit switches and automatically stops when the
end stop is reached.
With adjustable auxiliary switch (0...100%)
Accessories
Electrical accessories Description Type
Auxiliary switch 1 x SPDT add-on S1A
Auxiliary switch 2 x SPDT add-on S2A
Feedback potentiometer 140 Ω add-on P140A
Feedback potentiometer 200 Ω add-on P200A
Feedback potentiometer 500 Ω add-on P500A
Feedback potentiometer 1 kΩ add-on P1000A
Feedback potentiometer 2.8 kΩ add-on P2800A
Feedback potentiometer 5 kΩ add-on P5000A
Feedback potentiometer 10 kΩ add-on P10000A

Technical data sheet SM24A-S
www.belimo.com SM24A-S • en-gb • 2022-07-18 • Subject to change 3 / 4
Mechanical accessories Description Type
Actuator arm for standard shaft clamp (reversible) AH-20
Shaft extension 240 mm Ø20 mm for damper shaft Ø 12...21 mm CrNi AV12-25-I
Shaft extension 240 mm Ø20 mm for damper shaft Ø 8...22.7 mm AV8-25
Ball joint suitable for damper crank arm KH8, Multipack 10 pcs. KG8
Ball joint suitable for damper crank arm KH8 / KH10, Multipack 10 pcs. KG10A
Damper crank arm Slot width 8.2 mm, clamping range Ø10...18 mm KH8
Shaft clamp one-sided, clamping range Ø8...26 mm, Multipack 20 pcs. K-ENSA
Shaft clamp one-sided, clamping range Ø12...26 mm, for CrNi shaft
(INOX), Multipack 20 pcs.
K-ENSA-I
Shaft clamp reversible, clamping range Ø10...20 mm K-SA
Anti-rotation mechanism 180 mm, Multipack 20 pcs. Z-ARS180
Anti-rotation mechanism 230 mm, Multipack 20 pcs. Z-ARS230
Form fit insert 10x10mm, Multipack 20 pcs. ZF10-NSA
Form fit insert 12x12mm, Multipack 20 pcs. ZF12-NSA
Form fit insert 15x15 mm, Multipack 20 pcs. ZF15-NSA
Form fit insert 16x16mm, Multipack 20 pcs. ZF16-NSA
Mounting kit for linkage operation for flat installation ZG-SMA
Position indicator, Multipack 20 pcs. Z-PI
Base plate extension for SM..A to SM../AM../SMD24R Z-SMA
Electrical installation
Supply from isolating transformer.
Parallel connection of other actuators possible. Observe the performance data.
Wiring diagrams
AC/DC 24 V, open/close AC/DC 24 V, 3-point
Cable colours:
1 = black
2 = red
3 = white
S1 = violet
S2 = red
S3 = white
Cable colours:
1 = black
2 = red
3 = white
S1 = violet
S2 = red
S3 = white
Operating controls and indicators
Auxiliary switch settings
Note: Perform settings on the actuator only in deenergised state.
For the auxiliary switch position settings, carry out points to successively.1 4
Manual override button
Holding button pressed down: Gear train disengages.
Manual override is possible.
Shaft clamp
Turn until edge line displays the desired switching position of the actuator and
release button .
Auxiliary switch
Turn rotary knob until the arrow points to the vertical line.
Cable
Connect continuity tester to S1 + S2 or to S1 + S3.
If the auxiliary switch should switch in the opposite direction, rotate the auxiliary switch
by 180°.
1
2
A
1
3
4

Technical data sheet SM24A-S
www.belimo.com SM24A-S • en-gb • 2022-07-18 • Subject to change 4 / 4
Dimensions
Spindle length
Min. 48
Min. 20
Clamping range
When using a round shaft made of CrNi
(INOX): Ø 12...20 mm