Belimo LF24-SR US User manual

Technical Data 1405
Power Supply 24 VAC, ±20%, 50/60 Hz, 24 VDC, ±10%
Power Consumption Running 2.5 W
Power Consumption Holding 1 W
Transformer Sizing 5 VA (class 2 power source)
Shaft Diameter 3/8” to 1/2” round, centers on 1/2”
Electrical Connection 3ft [1m], 18 GA plenum cable with 1/2”
conduit connector
Overload Protection electronic throughout 0° to 95° rotation
Electrical Protection actuators are double insulated
Operating Range Y 2 to 10 VDC, 4 to 20 mA w/ ZG-R01 (500 Ω,
1/4 W resistor)
Input Impedance 100 k Ωfor 2 to 10 VDC (0.1 mA), 500 Ωfor
4 to 20 mA
Feedback Output U 2 to 10 VDC (max 0.7 mA) for 95°
Angle of Rotation Max. 95°,
Torque motor Min. 35 in-lbs [4 Nm]
Direction of Rotation (Motor) reversible with built-in switch
Direction of Rotation (Fail-Safe) reversible with CW/CCW mounting
Position Indication visual indicator, 0° to 95° (0° is full spring
return position)
Running Time (Motor) 150 sec
Running Time (Fail-Safe) <25 sec @ -4°F to 122°F [-20°C to 50°C],
<60 sec @ -22°F [-30°C]
Ambient Humidity max. 95% RH non-condensing
Ambient Temperature Range -22°F to 122°F [-30°C to 50°C]
Storage Temperature Range -40°F to 176°F [-40°C to 80°C]
Housing NEMA 2, IP54
Housing Material zinc coated steel
Agency Listings† cULus acc. To UL 873 and CAN/CSA C22.2
No. 24-93
Noise Level (Motor) <30 dB (A)
Noise Level (Fail-Safe) <62 dB (A)
Servicing maintenance free
Quality Standard ISO 9001
Weight 3.1 lb [1.4 kg]
†Rated Impulse Voltage 800V, Type of action 1.AA, Control Pollution Degree 3
Torque min. 35 in-lb, for control of air dampers.
Application
For fail-safe, modulating control of dampers in HVAC systems. Actuator sizing
should be done in accordance with the damper manufacturer’s specifications.
The actuator is mounted directly to a damper shaft from 3/8” up to 1/2” in
diameter by means of its universal clamp, 1/2” shaft centered at delivery.
For shafts up to 3/4” use K6-1 accessory. A crank arm and several mounting
brackets are available for applications where the actuator cannot be direct
coupled to the damper shaft. The actuator operates in response to a 2 to 10
VDC, or with the addition of a 500Ωresistor, a 4 to 20 mA control input from an
electronic controller or positioner. A 2 to 10 VDC feedback signal is provided for
position indication.
Operation
The LF series actuators provide true spring return operation for reliable
fail-safe application and positive close-off on air tight dampers. The spring
return system provides consistent torque to the damper with, and without,
power applied to the actuator. The LF series provides 95° of rotation and is
provided with a graduated position indicator showing 0 to 95°. The LF24-SR
US uses a brushless DC motor which is controlled by an Application Specific
Integrated Circuit (ASIC) and a microprocessor. The microprocessor provides
the intelligence to the ASIC to provide a constant rotation rate and to know
the actuator’s exact fail-safe position. The ASIC monitors and controls the
brushless DC motor’s rotation and provides a digital rotation sensing function to
prevent damage to the actuator in a stall condition. The actuator may be stalled
anywhere in its normal rotation without the need of mechanical end switches.
Power consumption is reduced in holding mode.
Dimensions (Inches[mm])
2.74" [
69.6]
2.25" [
57.1]
0.73"
[
18.54]
3.23" [
82]
0.25"
[
6.25]
1.15"
[
29.3]
2.3" [
58.42]
3.15" [
80]
7.66 " [ 194.501]
0.2" [
5.08]
0.98 " [ 25] 4.72 " [ 120] 0.39 " [ 10]
0.97" [
24.6]
3.86" [
98]
1.69 " [ 43] 3.66 " [ 93]
6.1 " [ 155]
3.66 " [ 93]
6.1 " [ 155]
0.26 " [ 6.5]
LF24-SR US - Damper Actuator
Modulating, Spring Return, 24 VAC/DC, for 2 to 10 VDC or 4 to 20 mA Control Signal
800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA / CARIBBEAN
Date created, 11/29/2017 - Subject to change. © Belimo Aircontrols (USA), Inc.

Accessories
AV6-20 6.7” shaft extension for 1/4” to 3/4” diameter shafts.
IND-LF LF position indicator.
K6 US Standard LF clamp (3/8” to 1/2”).
K6-1 LF clamp (1/2” to 3/4”).
KG10A Ball joint for 3/8” diameter rod, zinc plated.
KG6 Ball joint for 5/16” diameter rod, zinc plated.
KG8 Ball joint for 5/16” diameter rod, 90°, galvanized steel.
KH12 Univ. crankarm, slot 21/64” w, for 3/4” to 1” dia. shafts.
KH6 Univ. crankarm, slot 1/4” w, for 3/8” to 11/16” dia. shafts.
KH8 Univ. crankarm,slot 21/64” w,for 3/8” to 11/16” dia. shafts.
KH-LF LF crankarm (with 1/2” diameter shaft pass through).
KH-LFV V-bolt Kit for KH-LF.
LF-P Anti-rotation bracket LF.
SH10 Push rod for KG10A ball joint (36” L, 3/8” diameter).
SH8 Push rod for KG6 & KG8 ball joints (36” L, 5/16” diameter).
TOOL-06 8 mm and 10 mm wrench.
ZDB-LF Angle of rotation Limiter for LF.
ZF8-LF 8x8 mm form fit adaptor for LF.
ZG-109 Right angle bracket for ZS-260.
ZG-110 Stand-off bracket for ZS-260.
ZG-112 LF right angle bracket (4-1/2” H x 5-1/2” W x 2-1/2” D).
ZG-DC1 Damper clip for damper blade, 3.5” width.
ZG-DC2 Damper clip for damper blade, 6” width.
ZG-LF112 LF crankarm adaptor kit (includes ZG-112).
ZG-LF2 LF crankarm adaptor kit (T bracket included).
ZG-LMSA-1 Shaft extension for 3/8” diameter shafts (4” L).
ZG-LMSA-1/2-5 Shaft extension for 1/2” diameter shafts (5” L).
ZS-100 Weather shield - galvaneal (13” L x 8” W x 6” D).
ZS-101 Base plate for ZS-100.
ZS-150 Weather shield - PC w/ foam seal (16” L x 8-3/8” W x 4” D).
ZS-260 Explosion proof housing.
ZS-300 NEMA 4X, 304 stainless steel enclosure.
ZS-300-5 NEMA 4X, 316L stainless steel enclosure.
ZS-300-C1 1/2” shaft adaptor, standard wtih ZS-300(-5).
ZS-300-C2 3/4” shaft adaptor for ZS-300(-5).
ZS-300-C3 1” shaft adaptor for ZS-300(-5).
ADS-100 Analog to digital switch for modulating actuators.
IRM-100 Input rescaling module for modulating actuators.
PS-100 Actuator power supply and control simulator.
PTA-250 Pulse width modulation interface for modulating actuators.
SGA24 Positioner control for modualting actuators (surface mount).
SGF24 Positioner control for modulating actuators (flush mount).
ZG-R01 4 to 20 mA adaptor, 500Ω, 1/4 W resistor w 6” pigtail wires.
ZG-R02 50% voltage divider kit (resistors with wires).
ZG-SGF Mounting plate for SGF.
ZG-X40 120 to 24 VAC, 40 VA transformer.
Blk (1) Common
Red (2) + Hot
Wht (3)
Y Input, 2 to 10 V
Grn (5) U Output
Control Signal
(+)
VDC/mA
(–)
Feedbac
k Signal (+)
2 to 10 VDC (–)
Ω
500 Ω
Line
Volts
13511
24 VAC Transformer
7
2 to 10 VDC / 4 to 20 mA control
LF24-SR US - Damper Actuator
Modulating, Spring Return, 24 VAC/DC, for 2 to 10 VDC or 4 to 20 mA Control Signal
800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA / CARIBBEAN
Date created, 11/29/2017 - Subject to change. © Belimo Aircontrols (USA), Inc.

Typical Specification
Spring return control damper actuators shall be direct coupled type which
require no crank arm and linkage and be capable of direct mounting to a
shaft up to a 3/4” diameter and center on a 1/2” shaft (default). Actuator shall
deliver a minimum output torque of 35 in-lbs. The actuator must provide
modulating damper control in response to a 2 to 10 VDC or, with the addition
of a 500Ωresistor, a 4 to 20 mA control input from an electronic controller.
Actuators shall use a brushless DC motor controlled by a microprocessor
and be protected from overload at all angles of rotation. Run time shall be
constant, and independent of torque. A 2 to 10 feedback signal shall be
provided for position feedback. The actuator must be designed so that they
may be used for either clockwise or counter clockwise failsafe operation.
Actuators shall be cULus listed, have a 5 year warranty, and be manufactured
under ISO 9001 International Quality Control Standards. Actuators shall be as
manufactured by Belimo.
Wiring Diagrams
!WARNING! LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing and troubleshooting of this
product, it may be necessary to work with live electrical components.
Have a qualified licensed electrician or other individual who has been
properly trained in handling live electrical components perform these
tasks. Failure to follow all electrical safety precautions when exposed to
live electrical components could result in death or serious injury.
Meets cULus requirements without the need of an electrical ground
connection.
Provide overload protection and disconnect as required.
Actuators may also be powered by 24 VDC.
Only connect common to negative (-) leg of control circuits.
A 500 Ωresistor (ZG-R01) converts the 4 to 20 mA control signal to 2
to 10 VDC.
Actuators may be connected in parallel if not mechanically linked. Power
consumption and input impedance must be observed.
LF24-SR US - Damper Actuator
Modulating, Spring Return, 24 VAC/DC, for 2 to 10 VDC or 4 to 20 mA Control Signal
800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA / CARIBBEAN
Date created, 11/29/2017 - Subject to change. © Belimo Aircontrols (USA), Inc.