Simply the best way to drive a damper™ NM Simply the best way to drive...

Product Documentation Non-Spring Return Air Damper Actuators - 70 in-lb range

Simply the best way to drive a damper ®

33.33

®

Simply the best way to drive a damper™

NM

Belimo Product Range

2

ON THE COVER: Many of the major buildings in downtown Los Angeles are fitted with Belimo actuators.

LM24SR(2–10 VDC)

LM24SR-T

LMC24-SR*

LMC24SR-T*

NM24

24 V 24 V 24 V 24 V24 V

35 in-lb for damper areas up to 8 sq.ft.



NM24-SR(2–10 VDC)

NM24-SRS(start/span adjustable)

NM24-PWM(pulse widthmodulation)

GM24 GM24-SR(2–10 V DC)

Add-on auxiliary switches:SN1 (1 switch)SN2 (2 switches)

Add-on auxiliary switches:S1 (1 switch) S2 (2 switches)Add-on mid-position switch: SZSAdd-on feedback potentiometer: P...

On/OffFloating Proportional On/Off

Floating ProportionalProportionalOn/OffFloating

24 V

LM24LM24-S LM24-10P(10 KΩ Pot.)

LM24-5P0-T(5 KΩ Pot.)

LM24-T

LMC24*

AM24

AM24-S

24 V 24 V


AM24-SRAM24-PWM(pulse widthmodulation)

AM24-SRS(3 controlranges)

Add-on auxiliary switches for proportional actuators only:SA1 (1 switch) SA2 (2 switches)

Add-on feedback potentiometer: PA...

On/OffFloating Proportional

-S = built-in auxiliary switch

-T = terminal strip

* = 25 to 35 sec run time,27 in-lb torque

Non-Spring Return Actuators

Quality, Performance, Flexibility — Belimo offers the most complete actuator range.

™

®

Belimo Product Range

3

24 V 120V/230V 24 V 120 V24 V 120V/230V 24 V

On/Off Proportional On/OffFloating Proportional



NF24NF24-S

NF120NF120-S

NF230NF230-S

NF24-SR(2–10 VDC)

AF24AF24-S

AF24-3(Floating)

AF24-3-S(Floating)

AF120AF120-S

AF230AF230-S

AF24-SR(2–10 VDC)

AF24-SR-S(2–10 VDC)

AF24-SR95(0–135 Ω)

AF24-PWM(Pulse WidthModulation)

-S = built-in auxiliary switch

-3 = floating point control

* = output auxiliary power supply 20 VDC

24 V 120V/230V 24 V

On/OffFloating Proportional


LF24LF24-S

LF24-3LF24-3-S(Floating)

LF120LF120-S

LF230LF230-S

LF24-SRLF24-SR-S(2–10 VDC)

LF24-SR-MP*(6-9 VDC)

LF24-SR-S-MP*(6-9 VDC)

Spring Return Actuators

Proportional actuators can accept 4–20 mA control signal with the addition of a 500 Ω resistor. Damper areas based on 4 in-lb/ft2 damper torque loading. Parallel blade. No edge seals.

®

4

NM Series - at a glance

NM Series Direct Coupled Actuator®

Application Methods

Minimum 70 in-lb torque For damper areas up to 18 sq-ft

Medium Volume Control Dampers.

NM24 US NM24-SR US NM24-SRS US NM24-PWM US

Torque 70 in-lb

Power supply 24 VAC

Control signal on-off/floating point

Control signal modulating - 2 to 10 VDC

Control signal pulse width modulating

Control signal start/span adjustable

Running time 75 to 150 sec for 0 to 70 in-lb

Running time 150 sec independent of load.

External direction of rotation switch

Angle of rotation limiting (mechanical)

External manual override

Damper is mountedthrough a wall with controlshaft exposed, but spacetoo tight to direct couple. Actuator mounted on field-

fabricated plate to controla cone-type VAV damper

KH-8 Crankarm -final position must bevertical when damperis fully open.

Mount actuatorat a 45° angleto allow for full90° crankarmrotation.

ZG-NM3

ZG-NM3

ZG-105

NM24…

ZG-NM4

NM24…

NM24…

5

FE

AT

UR

ESA CLOSER LOOK…

NM Series Direct Coupled Actuator®

LISTED94D5TEMP. IND &REG. EQUIP.

UL

Cut labor costs with simple direct coupling.

Check damper position from a distance withclear position indicator.

Don’t wory about actuator burn-out. Belimo is overload-proof throughout rotation.

Enjoy added flexibility with easy mechanical stop to adjust angle of rotation.

Need to change control direction? Do it easily with a simple switch.

Simple manual override button helps you getup and running faster.

Auxiliary switch accessory (SN1,SN2) is easy to use, offers feedback or signal for additional device.

3 ft. plenum rated cable eases installationConduit connector provided: one less detailto worry about.

Microprocessor-controlled brushless DC motor increases actuator lifespan and reliability, provides constant running time independent of load. (Proportional actuators)

Bulk Packaging Offers BigValue for Large Jobs,Stocking Orders.

Bel

imo’s Commitment

to

Quality

Since 1991

ISO 9001

The Belimo Difference

Low Installed and Life-Cycle Cost.High degree of control accuracy. Easy to install and operate, durable. No maintenance.

Long Service Life.Components tested before assembly. Final product tested before shipment. Designed with over 20 years of experience in direct coupled applications.

Customer Commitment.Unconditional warranty. Knowledgeable, full-time technical support. World-wide sales and distribution.

Direct coupled damper actuator NM24 US

On-off, reversible, floating point, 24 V

®

6

ApplicationFor modulating or on-off control of dampers in HVAC sys-tems. Actual actuator sizing should be done in accor-dance with the damper manufacturer’s specifications.Control is on-off from an auxiliary contact of a fan motorcontactor, or a manual switch. The direction of rotation isreversible, for use with a floating point type control. Theactuator mounts directly to the damper operating shaft witha universal V-bolt clamp assembly.

OperationThe universal mounting bracket supplied with the actuatorwill prevent lateral movement of the actuator. The damperactuator is not provided with and does not require any limitswitches, but is protected against overloading. The angle ofrotation is mechanically limited to 95°. When reaching thedamper or actuator end position, the motor stops automati-cally. The gears can be manually disengaged by simplypressing down the spring loaded button on the actuatorcover. When this button is pressed down, the damperblades can be adjusted by hand. The position of the actua-tor is indicated by a visual pointer. Auxiliary switches are easily fastened directly onto the actu-ator body for signalling and switching functions.

AccessoriesAV 10-18 Damper shaft ExtensionSN1,SN2 Auxiliary switchesZG-H2 Actuator operator handleZG-NM3 Crank arm adaptor kit for ZG-105ZG-NM4 Crank arm adaptor kitZG-NMSA-1 Shaft adaptor for short shaftsZG-105 Mounting Bracket

Technical Data NM24 US

Power supply 24 VAC ± 20% 50/60 Hz 24 VDC ± 10%

Power consumption 2 W

Transformer sizing 3.5 VA (Class 2 power source)

Electrical connection 3 FT, 18 GA plenum rated (UL CL2P) 1/2 in. conduit connector

Overload protection electronic throughout 0 to 95° rotation

Angle of rotation 0 to 95°, adjustable stops

Torque min 70 in-lb [8 Nm]

Damper area (Note 1) 18 Sq Ft

Direction of rotation reversible with switch L/R

Position indication clip-on indicator

Manual override button on actuator

Running time 75 to 150 sec for 0 to 75 in-lb [0 to 8Nm] (0 to 90°)

Humidity 5 to 95% RH, noncondensing

Ambient temperature -4°F to +122°F [-20°C to +50°C]

Storage temperature -40°F to +176°F [-40°C to +80°C]

Housing NEMA type 2

Housing material UL 94-5V (flammability rating)

Agency Listings UL873 listed device, CSA 4813 02 certified

Noise level less than 35 db (A)

Servicing maintenance free

Quality Standard ISO 9001

Weight 1.8 lbs [0.8 kg]

DimensionsAll ratings in brackets are metric.

Torque min. 70 in-lb, for control of air damperssurfaces up to 18 sq. ft.


UL

Note 1 Damper area is calculated using approximately 4 in-lb/sq ft of damper area. Thisis an average torque requirement for good quality dampers operating under a 1"WC pressure drop. Check damper specifications for exact torque requirements.

3/8” to 3/4”

3/8” to 5/8”

Direct coupled damper actuator NM24 US

On-off, reversible, floating point, 24 V

7

®

Bulk packaging - NM24

To have better control of job site inventory and reduce the environmental impact of unnecessary packing material, theNM24 US, is available in a 24 unit bulk pack.

To order use the following part numbers:

Actuator type Bulk pack number

NM24 US NM24.1 (24/box)

T-Type bracketThese are included in the single-actuator packages and are available at no extra cost in the bulk packages upon request.

L-Type bracketThese are included onlyin the bulk-pack actuator packages.

NM24 US - Typical Specification:Control damper actuators shall be electronic direct coupledtype which require no crank arm and linkage. Actuators shallbe UL and CSA listed, have a 2 year warranty, and be man-ufactured under ISO 9001 International Quality ControlStandards. Actuators shall have reversing switch and manualoverride on the cover, and be protected from overload at allangles of rotation. Actuators shall be as manufactured byBelimo.

Wiring Diagrams

On-Off control of NM24 US Tri-State control of NM24 US

NM

24

2

2

3

31

1

24 VAC Transformer

Line Volts

Provide overload protection and disconnect as required.

Actuators are provided with color coded wires. Wirenumbers are provided for reference.

May also be powered by 24 VDC.

Blk (1) Common

Red (2) +

Wht (3) +

NM24 USL R

The indication of directionis valid for switch position R.

a

a opena closed

21 24 VAC Transformer

Line Volts

Blk (1) Common

Red (2) +

Wht (3) +

NM24 USL R

The indication of directionis valid for switch position R.

Notes:

3

Direct coupled damper actuator NM24-SR USProportional damper actuator, 24 V, for 2 to 10 VDC and 4 to 20 mA control signal

®

8

ApplicationFor proportional modulation of dampers in HVAC sys-tems. Actual actuator sizing should be done in accor-dance with the damper manufacturer’s specifications. Theactuator mounts directly to the damper operating shaftwith a universal V-bolt clamp assembly.

OperationThe actuator operates in response to a 2 to 10 VDC, 2 to10 V phasecut or, with the addition of a 500Ω resistor, a 4to 20 mA control input from an electronic controller orpositioner. A 2 to 10 VDC feedback signal is provided forpositon indication or master-slave applications. A built-in microprocessor automatically tests for theamount of rotation required to modulate the damper fullyclosed to fully open. The actuator will self-adjust to run ata consistent running time of 150 seconds, and rescale theinput signal so the entire 8 volt control range is used toprovide maximum resolution of the control system. Themicroprocessor will also correct for compression of tightclose-off gaskets with age, providing the actuator is noton its mechanical stops. A functional test of the actuator-damper assembly may be done by pressing in the manu-al override button, this will activate the actuators testmode and cycle the actuator fully open and closed.A 2 to 10 VDC feedback (U) is provided with full 8 voltoutput range proportional to the operational rotation of thedamper.A digital rotation sensing circuit protects the actuator in astall anywhere in its 95° working range without the needof limit switches.Auxiliary switches are easily fastened directly onto theactuator body for signalling and switching functions.

AccessoriesAV 10-18 Damper shaft extensionSN1,SN2 Auxiliary switchesZG-H2 Actuator operator handleZG-NM3 Crank arm adaptor kit for ZG-105ZG-NM4 Crank arm adaptor kitZG-NMSA-1Shaft adaptor for short shaftsZG-105 Mounting bracket

Technical Data NM24-SR US

Power supply 24 VAC, ± 20%, 50/60 Hz 24 VDC, ±10%

Power consumption 1.3 W


Control signal 'Y' 2 to 10 VDC, 4 to 20mA (w/500 Ω, 1/4 W resistor)

Input impedence 100kΩ for 2 to 10VDC 500Ω for 4 to 20 mA

Operating range 2 to 10 VDC, 4 to 20 mA

Feedback output 'U' 2 to 10 VDC, 0.7 mA max

Electrical connection 3 ft, 18 GA plenum rated (UL CL2P) cable,1/2” conduit connector


Torque (Note 1) min 70 in-lb (8 Nm)

Damper area (Note 2) 18 sq ft

Direction of rotation reversible with Switch “L-R”L = CW with an increase in voltageR = CCW with an increase in voltage

Position indication clip on indicator


Angle of rotation 0-95° adjustable stops

Running time (35-95°) 150 seconds independent of max. angle ofrotation or torque

Running time (0-35°) 0-150 seconds proportional to max. angle ofrotation (Note 3)

Run time stability ± 5%


Operating temperature -4 to +122° F (-20 to +50° C)

Storage temperature -40 to +176° F (-40 to +80° C)

Mounting position not sensitive to position

Housing NEMA 2


Noise level less than 35 dB (A)

Agency listings UL 873 listed device, CSA 4813 02 certified

Quality standard ISO 9001


Weight 1.8 lbs. (0.8kg.)

Note 1 Minimum torque is produced at minimum voltage, minimum temperature.


Note 3 The on board microprocessor measures the actuators full stoke on startup. It thenadjusts the actuator speed to ensure 150 second run time for 35°-95°. Below 35°stroke, the speed is constant and run time varies with rotation angle.




UL

3/8” to 3/4”

3/8” to 5/8”

Direct coupled damper actuator NM24-SR USProportional damper actuator, 24 V, for 2 to 10 VDC and 4 to 20 mA control signal

9

®

Wiring diagrams

Typical Specification:Control damper actuators shall be electronic direct coupledtype which require no crank arm and linkage. Actuators shallbe UL and CSA listed, have a 2 year warranty, and be man-ufactured under ISO 9001 International Quality ControlStandards. Actuators shall have reversing switch and geardisengagement button on the cover, and be electronically pro-tected from overload at all angles of rotation. Actuators shallrespond to 2 to 10VDC output relative to position regardlessof the amount of damper rotation. Actuators shall have brush-less DC motor. Run time shall be constant and independentof torque and angular rotation between 35° and 95°. A 2 to 10VDC feedback signal shall be provided for position indicationor master-slave applications. Actuators shall be as manufac-tured by Belimo.

2 to 10 VDC control of NM24-SR US 4 to 20 mA control of NM24-SR US with 2 to 10 VDC feedback output

2

2

1

1

3

3

4

5

4

(–)(+)

(–)(+)

24 VAC Transformer

Line Volts

4 to 20 mAControl Signal

2 to 10 VDCFeedback Signal


Actuators are provided with color coded wires. Wirenumbers are provided for reference.

Connect actuator common (Wire 1) to Negative (–) leg ofcontrol circuits only.

Actuator and controller must have separate transformers.

May also be powered by 24 VDC.

Blk (1) Common

Red (2) + Hot

Wht (3) Y 2 to 10V InputGrn (4) U 2 to 10V Output

NM24-SR USL R

Ω500Ω

24

1

(–)(+)

24 VAC Transformer

Line Volts

2 to 10 VDCControl Signal

Blk (1) Common

Red (2) + Hot

Wht (3) Y 2 to 10V InputGrn (4) U 2 to 10V Output

NM24-SR USL R

Bulk packaging - NM24-SR US

To have better control of job site inventory and reduce theenvironmental impact of unnecessary packing material, the NM24-SR US is available in a 24 unit bulk pack.



NM24-SR NM24-SR.1 (24/box)

NM

24-SR

Notes:



55

Direct coupled damper actuator NM24-SRS USProportional damper actuator, 24 VAC, 0 to 29 VDC and 4 to 20 mA control range, start point and working span adjustable.

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10

ApplicationFor proportional modulation of dampers in HVAC sys-tems. Actual actuator sizing should be done in accor-dance with the damper manufacturer’s specifications.Theactuator mounts directly to the damper operating shaftwith a universal V-bolt clamp assembly.

OperationThe NM24-SRS US is designed to work with input signalsin the range of 0 to 29 VDC from an electronic controlleror positioner. There are 2 potentiometers to adjust thestarting point and working span of the actuator. The startpoint can be adjusted from 0 to 15 VDC and the spanfrom 2 to 14 VDC. This adjustment range allows for non-standard control ranges or the sequencing of multipleactuators from one control signal. A 4 to 20 mA signalmay also be used with the addition of a 500 Ω resistor.A built-in microprocessor automatically tests for theamount of rotation required to modulate the damper fullyclosed to fully open. The actuator will self-adjust to run ata consistent running time of 150 seconds, and rescale theinput so the entire preset working span is used to providemaximum resolution of the control system. The micro-processor will also correct for compression of tight close-off gaskets with age, providing the actuator is not on itsmechanical stops. A functional test of the assembly maybe done by pressing the manual override button. This willcycle the actuator fully open and fully closed.A 2 to 10 VDC feedback (U) is provided with a full 8 Voutput range proportional to the operational rotation of thedamper.A digital rotation sensing circuit protects the actuator in astall anywhere in its 95° working range without the needof limit switches.Auxiliary switches are easily fastened directly onto theactuator body for signalling and switching functions.

AccessoriesAV 10-18 Damper shaft extensionSN1,SN2 Auxiliary switchesZG-H2 Actuator operator handleZG-NM3 Crank arm adaptor kit for ZG-105ZG-NM4 Crank arm adaptor kitZG-NMSA-1Shaft adaptor for short shaftsZG-105 Mounting bracket

Technical Data NM24-SRS US

Power supply 24 VAC, ± 20%, 50/60 Hz



Control signal 'Y' 0 to 29 VDC, 4 to 20mA (w/500 Ω, 1/4 W resistor)

Start point ‘U0’ adjustable 0 to 15 VDC

Working span ‘∆U’ adjustable 2 to 14 VDC

Factory settings startpoint 0 VDC, span 14 VDC

Input impedence 100kΩ for 0 to 29VDC 500Ω for 4 to 20 mA

Feedback output 'U' 2 to 10 VDC, 0.7 mA max





Direction of rotation reversible with switch “L-R”L = CW with an increase in voltageR = CCW with an increase in voltage



Angle of rotation 0 to 95° adjustable stops


Running time (0-35°) 0 to 150 seconds proportional to max. angleof rotation (Note 3)


Humidity 5 to 95% RH, Non condensing

Ambient temperature -4 to +122° F (-20 to +50° C)



Housing NEMA 2













UL

3/8” to 3/4”

3/8” to 5/8”

11

Direct coupled damper actuator NM24-SRS USProportional damper actuator, 24 VAC, 0 to 29 VDC and 4 to 20 mA control range, start point and working span adjustable.

5

5

Wiring diagrams

Range setting Instructions

Voltage control of NM24-SRS US 4 to 20 mA control of NM24-SRS with 2 to 10 VDC feed -back output

2

2

1

1

3

3

4

4

(–)(+)

(–)(+)

24 VAC Transformer

Line Volts




Actuators are provided with color coded wires. Wire num-bers are provided for reference.

Connect actuator common (Wire 1) to Negative (–) leg ofcontrol circuits only.

The start point and span can be adjusted to sequencemultiple actuators from one control signal. Up to 4 actua-tors may be paralleled from 1 resistor.

Actuator and controller must have separate transformers.

Blk (1) Common

Red (2) + Hot

Wht (3) Y InputGrn (4) U Output

L R

Ω500Ω

2

4

51

(–)(+)

24 VAC Transformer

Line Volts

Control Signal

Blk (1) Common

Red (2) + Hot

Wht (3) Y InputGrn (4) U Output

L R

To OtherActuators

NM24-SRS USNM24-SRS US

Typical Specification:Control damper actuators shall be electronic direct coupledtype which require no crank arm and linkage. Actuators shallbe UL listed and CSA certified, have a 2 year warranty, andbe man-ufactured under ISO 9001 International QualityControl Standards. Actuators shall have reversing switch andgear disengagement button on the cover, and be electronical-ly protected from overload at all angles of rotation. Actuatorsshall have an adjustable control start point of 0 to 15 VDC anda working span of 2 to 14 VDC. The response to the workingspan will produce a proportional change in damper positionregardless of the amount of damper rotation. Actuators shallhave brushless DC motor. Run time shall be constant andindependent of torque and angular rotation between 35° and95°. A 2 to 10 VDC feedback signal shall be provided forposition indication or master-slave applications. Actuatorsshall be as manufactured by Belimo.

NM

24-SR

S®

∆U [V]U [V]0

0 1

2 3

4 5

6 7 8 9 10 11 12 13 14 15 2

3 4

5 6

7 8 9 10 11 12 13 14

L R

Controls for setting the operating range and direction ofrotation

Operating range setting instructions1. Set the range start point adjustment (U0) to the desired

voltage to start modulation.2. Set the working span (∆U) for the control working span.

Example: controller output 6 to 9VDCa. Set the start point to 6 VDCb. Set the working span to 3 VDC (9-6=3 VDC)

Notes:

Bulk Packaging




NM24-SRS US NM24-SRS.1 (24/box)



Direct coupled damper actuator NM24-PWM USProportional damper actuator, 24 VAC, with PWM positioning signal and 2 to 10 VDC position feedback

12

®

ApplicationFor proportional modulation of dampers in HVAC sys-tems. Actual actuator sizing should be done in accor-dance with the damper manufacturer’s specifications.Theactuator mounts directly to the damper operating shaftwith a universal V-bolt clamp assembly.

OperationThe NM24-PWM actuator is controlled with a pulse widthmodulating positioning signal. The signal range is exter-nally selectable in four ranges: 0.02 to 6.0 sec, 0.02 to5.0 sec, 0.1 to 25.5 sec, 0.59 to 2.93 sec.A built-in microprocessor automatically tests for theamount of rotation required to modulate the damper fullyclosed to fully open. The actuator will self-adjust to run ata consistent running time of 150 seconds, and rescale theinput signal so the entire control range is used to providemaximum resolution of the control system. A functionaltest of the actuator-damper assembly may be done bypressing in the manual override button, this will activatethe actuators test mode and cycle the actuator fully openand closed.A 2 to 10 VDC feedback (U) is provided with full 8 voltoutput range for 0 to 100% angle of rotation position indi-cation or as a master-slave control signal.The actuator incorporates an electronic digital rotationsensing circuit to protect the actuator in a stall conditionanywhere in its 95° working range without the need oflimit switches.Auxiliary switches are easily fastened directly onto theactuator body for signalling and switching functions.

AccessoriesAV 10-18 Damper shaft extensionSN1,SN2 Auxiliary switchesZG-H2 Actuator operator handleZG-NM3 Crank arm adaptor kitZG-NM4 Crank arm adaptor kitZG-NMSA-1Shaft adaptor for short shaftsZG-105 Mounting bracket

Technical Data NM24-PWM US

Power supply 24 VAC, ± 20%, 50/60 Hz


Transformer sizing 3.5 VA (class 2 power source)

Control signal 'Y' pulse width modulating signal

Operating range 4 ranges externally selectable:0.59 to 2.93 sec 0.1 to 25.5 sec0.02 to 5.0 sec 0.02 to 6.0 sec

Minimum pulse interval 15 ms between pulses

Input impedence 1.5 kΩFeedback output 'U' 2 to 10 VDC, 0.7 mA max





Direction of rotation reversible with switch “L-R”



Angle of rotation 0 to 95° adjustable stops


Running time (0-35°) 0-150 seconds proportional to max. angle ofrotation (Note 3)



Ambient temperature -4 to +122° F (-20 to +50° C)



Housing type NEMA 2

Housing material rating UL 94-5V (flammability rating)












UL

3/8” to 3/4”

3/8” to 5/8”

Direct coupled damper actuator NM24-PWM USProportional damper actuator, 24 VAC, with PWM positioning signal and 2 to 10 VDC position feedback

13

®

Typical Specification for NM24-PWM USControl damper actuators shall be electronic direct coupledtype which require no crank arm and linkage. Actuators shallbe UL and CSA listed, have a 2 year warranty, and be man-ufactured under ISO 9001 International Quality ControlStandards. Actuators shall have reversing switch and geardisengagement button on the cover, and be electronically pro-tected from overload at all angles of rotation. Actuators shallhave an input pulse length selector switch which will allow theuse of the following pulse lengths:

0.02 to 6.0 seconds 0.02 to 5.0 seconds 0.1 to 25.5 seconds 0.59 to 2.93 seconds

The length of the pulse as compared to the pulse lengthselected, shall position the actuator proportionately regardlessof the amount of damper rotation. Run time shall be constant.Control shall be with pulse width modulation positioning sig-nal. A 2 to 10 VDC feedback signal shall be provided forposition indication or master-slave applications. Actuatorsshall be as manufactured by Belimo.

Pulse width modulation control of NM24-PWM US

(Dry Contact)

2

3

1

(COM)

(+)

24 VAC Transformer

Line Volts

PWM

Control SignalFeedback

Blk (1) Common

Red (2) + Hot

Wht (3) Y PWM InputGrn (4) U 2 to 10V Output

NM24-PWM US

L R

Pulse width modulation control of NM24-PWM US

(Triac Source)

2

2

3

4

3

1

4

1

(+)(+)

Controller Power Source

Line Volts

24 VACControl Signal

Feedback

Controller Common



PWM range is selectable in 4 ranges

The feedback signal cannot be used if the analog input ofthe controller is referenced to the system ground.

Blk (1) Common

Red (2) + Hot


NM24-PWM US

L R

Wiring Diagrams

Pulse width modulation control of NM24-PWM US (Triac Sink)

2

3

1

(+)(+)

Controller Power Source

Line Volts

Control SignalFeedback

Blk (1) Common

Red (2) + Hot


NM24-PWM US

L R

24 VAC

NM

24-PW

M

Notes:

Bulk Packaging




NM24-PWM US NM24-PWM.1 (24/box)



Installation InstructionsQuick-Mount Visual Instructions for Mechanical Installation

14

®

QUICK-MOUNT VISUAL INSTRUCTIONS

1. Turn damper blades to their fully closed position. Slide actu-ator onto damper shaft. Tighten the nuts on the universalclamp only finger-tight at this time.

2. Slide anti-rotation mounting strap up under actuator so that itengages actuator at the center cut-out. Secure to ductworkwith self-tapping screws.

3. Loosen nuts on clamp. Press manual override button.Rotate the clamp to about 5° from the closed position (1/16to 1/8" between stop and clamp). Tighten the two nuts on theuniversal clamp with a 10 mm wrench using 4 to 6 ft-lb of torque.

4. Adjust end stops, if required.

5. Mount actuator indoors. If mounted outdoors, use approvedprotective enclosure.

1

2 3

4

T- bracket

L-bracket

T- bracket

L-bracket

5°

min. 1.5”

3/16"

3/16"

Installation InstructionsMechanical Installation

15

®

1. Remove the plastic position indicator from the actuator. Slipthe actuator's universal clamp over the damper shaft. Makesure that the bottom of the actuator (metal side) is towardthe duct and the controls on the cover are accessible. Placethe actuator in the desired mounting position.

2. Turn the damper shaft until the blades are fully closed.3. Hand tighten the two nuts on the NM24 . . universal clamp. 4. Slide the stud of the anti-rotation bracket into the slot in the

bottom of the actuator. Bend the strap as needed to supportthe rear of the actuator.

5. Fasten the strap to the duct with two screws. We recom-mend No. 8 self tapping sheet metal screws.

6. Loosen the two nuts on the universal clamp. Disengage theactuator gear train by pressing the “manual override button”(half round black button near the cable entry). Keeping thegears disengaged, and the damper fully closed, rotate theclamp until it is about 5° from the closed position or approxi-mately 1/16 to 1/8 of an inch between the mechanical stopand the universal clamp.

7. Tighten the two nuts on the clamp with an 10 mm wrench(Belimo Tool-01). Use 4…6 ft-lb of torque.

The damper is now fully closed but the actuator is 5° from fullyclosed. This is called “pre-loading” the actuator. When theactuator is powered and sent to the closed position: it will put its

full torque on the shaft compressing the edge and blade seals.This ensures that the damper will meet its leakage rating. The actua-tor is electronically protected from overload and will not be damaged.

Adjustable stopsThe adjustable stops are needed when there is no damper stopor if you want the damper to halt rotating before it reaches itsstops. The NM24. . actuator can be indefinitely stalled in anyposition without harm. 1. Loosen the two end stops with a No. 2 Phillips head screwdriv-

er being careful not to unscrew the captive nut under the slot.2. Move the stops to the desired position and re-tighten the screws.

Manual overrideThe Belimo NM24. . actuators have a black, half round “manual over-ride button” located next to the cable entry. Press this button and thegear train is disengaged so the damper shaft can be moved manual-ly. Release the button and the gear train is re-engaged.

Testing the installation without power1. Disengage the gear train with the manual override button

and move the shaft from closed to open to closed. Ensurethat there is no binding and that the damper goes fully openand closes with 5° of actuator stroke left.

2. Correct any problems and retest.

General Information

Standard Mounting

Preliminary steps1. Belimo actuators should be mounted indoors in a dry, relatively clean environment free from corrosive fumes. If the actuator is

to be mounted outdoors, a protective enclosure must be used to shield the actuator. 2. For new construction work, order dampers with extended shafts . Instruct the installing contractor to allow space for mounting and

service of the Belimo actuator on the shaft. The damper shaft must extend at least 2" from the duct. If the shaft extends less than 2" orif an obstruction blocks access, the shaft can be extended with the AV 10-18 shaft extension or the ZG NMSA-1 for applications withminimal mounting area.

For replacement of existing gear train actuators, there are two options: A. From a performance standpoint, it is best to mount the actuator on the damper shaft. B. If the damper shaft is not accessible, mount the NM24-. . actuator with a ZG-NM4 linkage kit, to convert to a crankarm style

application or the ZG-105 mounting bracket with the ZG-NM3.

INSTALLA

TION

Basic Formula for Actuator Sizing

Consult the damper manufacturer for rated torque loading. Call your Belimo representative for help in determining torque loadingwith linkage applications.

Damper Area x Rated Torque Loading of Damper = Total in-lb Required(30 ft2) x (4 in-lb/ft2) = (120 in-lb) Belimo AF/AM 133 in-lb/160 in-lb

When rated torque loading of damper is not available:The following general selection guide may be used when it is not possible to obtain the damper manufacturer’s rated torque loading.Note multiplier used for face velocity (feet per minute, FPM).

Damper TypeTorque Loading in-lb/ft 2

< 1000 FPM/2 in w.g. 1000-2500 FPM/3 in w.g. (x 1.5) 2500-3000 FPM/4 in w.g. (x 2.0)

Air-tight applicationParallel blade/edge seals 7 10.5 14Opposed blade/edge seals 5 7.5 10

Normal close-off applicationParallel blade/no edge seals 4 6 8Opposed blade/no edge seals 3 4.5 6

Installation InstructionsGeneral Wiring

16

®

WARNING The wiring technician must be trained and experi-enced with electronic circuits. Disconnect power supply beforeattempting any wiring connections or changes. Make all con-nections in accordance with wiring diagrams and follow allapplicable local and national codes. Provide disconnect andoverload protection as required. Use copper, twisted pair, con-ductors only. If using electrical conduit, the attachment must bemade with flexible conduit.

Always read the controller manufacturer's installation liter -ature carefully before making any connections. Follow allinstructions in this literature. If you have any questions, contactthe controller manufacturer and/or Belimo.

Transformer(s)The NM24 type actuator requires a 24 VAC transformer anddraws a maximum of 3.5 VA per actuator.

CAUTION: It is good practice to power electronic or digital con-trollers from a separate power transformer than that used foractuators or other end devices. The power supply design in ouractuators and other end devices use half wave rectification.Some controllers use full wave rectification. When these twodifferent types of power supplies are connected to the samepower transformer and the DC commons are connected togeth-er, a short circuit is created across one of the diodes in the fullwave power supply, damaging the controller. Only use a singlepower transformer to power the controller and actuator if youknow the controller power supply uses half wave rectification.

Multiple actuators, one transformer Multiple actuators may be powered from one transformer pro-vided the following rules are followed:1. The TOTAL current draw of the actuators (VA rating) is less

than or equal to the rating of the transformer.2. Polarity on the secondary of the transformer is strictly fol-

lowed. This means that all No. 1 wires from all actuatorsare connected to the common leg on the transformer and allNo 2 wires from all actuators are connected to the hotleg.Mixing wire No. 1 & 2 on one leg of the transformer willresult in erratic operation or failure of the actuator and orcontrols.

Multiple actuators, multiple transformersMultiple actuators positioned by the same control signal may bepowered from multiple transformers provided the following rulesare followed:1. The transformers are properly sized.2. All No. 1 wires from all actuators are tied together and tied

to the negative leg of the control signal. See wiring diagram.

Wire length for NM type actuatorsKeep power wire runs below the limits listed in the Fig. 1. Ifmore than one actuator is powered from the same wire run,divide the allowable wire length by the number of actuators todetermine the maximum run to any single actuator. Example: 3 actuators, 16 Ga wire

1000 Ft ÷ 3 Actuators = 333 Ft. Maximum wire run.

Maximum wire length:

Wire Size Max. Feet. Wire Size Max. Feet12 Ga 2500 Ft. 18 Ga 600 Ft.14 Ga 1600 Ft. 20 Ga 350 Ft16 Ga 1000 Ft. 22 Ga 175 Ft

Fig. 1

Wire Type and Wire Installation TipsFor most installations, 18 or 16 Ga. cable works well with theNM24 type actuators. Use code approved wire nuts, terminalstrips or solderless connectors where wires are joined. It isgood practice to run control wires unspliced from the actuator tothe controller. If splices are unavoidable, make sure the splicecan be reached for possible maintenance. Tape and/or wire tiethe splice to reduce the possibility of the splice being inadver-tently pulled apart.

The NM24. . proportional actuators have a digital circuit that isdesigned to ignore most unwanted input signals (pickup). Insome situations the pickup may be severe enough to causeerratic running of the actuator. For example, a large inductiveload (high voltage AC wires, motors, etc.) running near thepower or control wiring may cause excessive pickup. To solvethis problem, make one or more of the following changes:1. Run the wire in metallic conduit.2. Reroute the wiring away from the source of pickup.3. Use shielded wire (Belden 8760 or equal). Ground the

shield to an earth ground. Do not connect it to the actuatorcommon.

Reversing switch, “L-R”The NM24-/SR/SRS/PWM US actuators have a reversing switchon the cover labeled “L-R”. With the switch in position “L”, theactuator rotates clockwise with an increase in voltage or cur-rent. With the switch in Position “R”, the actuator rotates coun-terclockwise with an increase in voltage or current.

The NM24 US, on-off, tri-state actuators when set for switchposition “R”, rotate clockwise when power is applied to wire #3,and counterclockwise when power is applied to wire #2.

During checkout, the switch position can be temporarilyreversed and the actuator will reverse its direction. This allowsthe technician a fast and easy way to check the actuator opera-tion without having to switch wires or change settings on thethermostat. When the check-out is complete, make sure theswitch is placed back to its original position.

General Wiring Instructions

Installation instructionsOperational Information

17

®

Additional Operational Information for NM24-SR US, NM24-SRS US, NM24-PWM US Proportional Actuators

Controller types Belimo NM24-SR US actuator is compatible with virtually allelectronic controllers using a 2 to 10 VDC control signal. TheNM24-SRS US actuator uses a control signal with an adjustablerange of 0 to 29 VDC. Both will work with a 4 to 20 mA signalwith the addition of a 500Ω resistor.

The NM24-PWM US actuator works with any controller which canprovide a timed, on-off pulse. This pulse can be supplied to theactuator through a dry contact or a triac, sink or source connection.

Microprocessor controlled brushless DC motorAn on board microprocessor monitors operation and controls abrushless DC motor. It also performs a self test upon power up.

Overload protectionThe Belimo NM24-SR/SRS/PWM US actuators are protectedfrom overload at all angles of rotation. The on board micro-processor constantly monitors the rotation of the DC drive motorinside the actuator and stops the pulses to the motor when itsenses a stall condition. The DC motor remains energized andproduces full rated torque to the load. This helps ensure thatdampers are fully closed and that edge and blade seals arealways properly compressed.

Brushless DC motor operationBelimo's brushless DC motor spins by reversing the poles ofstationary electromagnets housed inside rotating permanentmagnets. The electromagnetic poles are switched by a micro-processor and a special ASIC (Application Specific IntegratedCircuit) developed by Belimo. Unlike the conventional DCmotor, there are no brushes to wear or commutators to foul.

Motor position detectionBelimo Brushless DC motors do not use potentiometers for posi-tioning. Inside the motor are three "Hall Effect" sensors. Thesesensors detect the spinning rotor and send pulses to the micro-processor which counts the pulses and calculates the position.

Initialization or function checkWhen a power source is applied to terminal 1 and 2 the motorcarries out an initialization of the actuator. If required, a functioncheck can also be made after connection of the supply voltageby pressing in the manual override button and then releasing it.The purpose of this initialization is to determine the mechanicalangle of rotation and to adapt the running time to the angle ofrotation. The function check can also be used to verify that thedamper, and linkage (if mounted) are running free and are cor-rectly adjusted.

The function check makes the motor run first to the clockwise orcounter-clockwise stop, depending on the selector switch posi-tion. Thereafter it runs to the opposite stop. During this opera-tion the output (U5) supplies 2 VDC.

Re-initializationWhenever the “manual override button” is pressed and releasedand the actuator is powered, the microprocessor will “re-initial-ize”. See “Initialization or function check” above.

Motor speed and run timeThe microprocessor also controls the speed of the motor. In aconventional DC motor, increased torque slows the motorspeed. Since the microprocessor determines the total rotation

during initialization, it can calculate how fast to turn the motor toinsure a 150 second run time independent of the total rotationover a range of 35-95°. Below 35°, the motor runs at a constantspeed and the run time is proportional to the angle.

Input ResolutionDuring initialization the microprocessor determines the maxi-mum rotation angle. It then divides this angle by the workingspan of the input signal and calculates how many degrees totravel for each volt change in control signal or pulse length.This means that the working span (Example: 8 V for a 2 to 10VDC Signal) is consistent for any angle of maximum rotationdown to as low as 35°. This greatly simplifies engineering andcheckout when dampers have differing maximum rotations.

Total Rotation Run Time Total Rotation Run Time95° 150 Sec. 35° 150 Sec.75° 150 Sec. 15° 64 Sec.55° 150 Sec. 5° 21 Sec.

NM24-SR/SRS/PWM US Angle of Rotation vs. Run TimeRelationshipsInterpolate for total rotation between the numbers listed.

Monitoring and self-adjustment of close-off positionThe purpose of this function is to correct the mechanical toler-ances within 4% which can change over time. It assures thatthe actuator always presses the damper blade with maximumpressure onto the seal. The end positions are automaticallychecked as soon as the actuator position comes within 3% ofthe total angle of rotation, at full open or full closed.

If the actuator registers a change of the end position of ≤ 4%,the angle of rotation will be modified. If the actuator registers achange of the end position > 4%, the actuator will consider it anerror and not modify the angle of rotation.

The actuator will self-adjust until it reaches its mechanical stops.

AccessoriesAV 10-18 Shaft extension Tool-01 10 mm wrench for tightening the universal clamp's nuts.Tool-03 #10 tamper proof Torx screwdriver required for

installation of ZG-NM3 or ZG-NM4 linkage kits.SGA24 Minimum and/or manual positioner (electronic) In

NEMA 4 enclosure for surface mounting.SGF24 Minimum and/or manual positioner (electronic)

For flush panel mounting.SN1 Auxiliary Switch, 1 x SPDTSN2 Auxiliary Switch, 2 x SPDTZG-NM4 Linkage kit. Includes 1 crankarm for the actuator,

2 ball joints and 1 mounting plate for the actuator.Customer needs to supply 5/16" connecting rod anda crank arm for the damper.

ZG-NM3 Linkage kit for use with the ZG-105 mountingbracket. Includes 1 crankarm for the actuator and2 ball joints.

ZG-NMSA-1 Shaft adaptor for short shaftsZG-H2 Actuator operator handle A heavy gauge steel

handle which attaches to the universal clamp.For use where frequent manual positioning ofdampers is required.

ZG-105 Mounting bracket, when direct coupled mountingis not possible.

18

Mounting Instructions

1. Remove pointer assembly from the actuator. Press downthe manual override button and rotate the actuator fullycounter-clockwise.

2. Invert SN . switch and turn the driver disk fully clockwise asindicated.

3. Slide SN . switch onto actuator and check for the correctmating of the driver disk to the universal clamp. Secure withscrew.

4. Adjust switch dials as necessary

6. Remount the white plastic pointer only onto SN . switch.

SN1, SN2 Auxiliary switchesFor the direct coupled actuator NM 2…

OperationThe SN1 and SN2 auxiliary switches are used to indicate whena desired position of a damper is reached or to interface addi-tional controls for a specific control sequence. They are modu-lar units that mount directly onto the NM type actuators andheld in place with a prefitted screw. A driver disk is attached tothe actuator clamp and offers direct transmission of the actua-tor position to the microswitch operating cams. The switchingpoints can be set over the full scale of 0 to 10 simply by adjust-ing the slotted discs.

NOTE: will not mount to NM actuators manufactured priorto May 1994

Technical Data SN1 SN2

No. of switches 1xSPDT 2xSPDT

Switching capacity 6 A (2.5A) 250 VAC

Switching point adjustable over full actuator rotation 0 to 10. Pre-setting with scale possible.

Electrical connection 3 ft. 18 GA cable [1 m long 0.75mm2]

Humidity 5 to 95% RH noncondensing

Ambient temperature -22° F to +122° F [-30° C to +50° C]

Storage temperature -40° F to +176° F [-40° C to +80° C]

Housing type NEMA type 2

Housing material rating UL 94-V0 (flammability rating)

Weight 4 oz [125 g] 5.6 oz [175 g]

®

Wiring Diagrams

SN2

S1

S2

S3

S4

S5

S6

SN1

NC

NO

S1

S2

S3

N.C.

N.O.

N.C.

N.O.

N.C.

N.O.

1

2 3 4 5

Voltage Resistive Inductive120 6.0 A 5.0 A250 6.0 A 2.5 A

AccessoriesAdditional accessories

19

®

ZG-H2 Actuator Operator Handle

Used when it is desirable to move or adjust damper by hand.Increases leverage and precision during set-up and testing.

ZG-NMSA-1 Shaft adaptor

Used on 1/2" diameter shafts that are shorter than 3/4" andmounting space is minimal.

AV 10-18 Shaft Extension

For damper shafts 3/8 to 11/16 in [10 to 18] dia or 3/8 to 9/16 in[10 to 14] square.

ZG-NM3 - Crank arm adaptor kit

For use when the actuator cannot be mounted directly to thedamper shaft. Similar to ZG-NM4 (below) but without mountingplate. To be used with ZG-105 (right).

ZG-105 Mounting Bracket

ZG-NM4 - Crank arm adaptor kit

For use when the actuator cannot be mounted directly to thedamper shaft.

Mounting Instructions for ZG-NM4 Linkage Kit

1. Remove the four retaining screws ➀ in the base of theactuator.

Note: A # 10 tamper-proof Torx screwdriver is required.

2. Install the mounting plate ➁ to the base of the actuatorusing the four retaining screws from step #3.

3. Mount the actuator assembly in a convenient location bythe damper.

4. Insert the crankarm assembly ➂ into the universal clampand tighten in the desired position.

5. Adjust the crank arm linkage for proper damper operation

SGA24/SGF24

Minimum and/or manual positioner (electronic), SGA24 isenclosed in a NEMA 4 housing. The SGF24 is for flush panelmounting.

➀

➁

➂ (by others)

SGA24SGF24

ACC

ESSOR

IES

Special Wiring DiagramsNM24-SR /-SRS US

20

®

4 to 20 mA control of NM24-SR/SRS US with 2 to 10 VDCfeedback output. The feedback circuit can also be used with a2 to 10 VDC input.

Override open of a NM24-SR/SRS US Both the overrideclosed and the override open circuit can be combined on oneactuator. Wire the relay contacts in series. Determine whichsignal has the highest precedence and connect that relay electri-cally closest to the actuator.

Minimum position control of NM24-SR/SRS US from a volt -age signal and through a SGA24/SGF24 positioner.

Override closed of a NM24-SR/SRS US.

21

3

(–)(+)

(–)(+)

24 VAC Transformer

Line Volts



Actuator drives to the high signal position when 24VAC hotis connected to wire 3 (SPDT relay energized). AdjustReversing Switch (L-R) so the high signal positions thedamper to its desired position.CAUTION: Do not short 24 VAC hot to the (+) leg of thecontrol signal or the controller may be damaged.

Input: NM24-SR US - 2 to 10 VDCNM24-SRS US - 0 to 29 VDC (adjustable)

Actuator drives to the low signal position when there is nosignal to wire 3 (SPST relay energized). Adjust reversingswitch (L-R) so the low signal positions the damper in itsdesired end position.

SGA24 (NEMA 4 enclosure and SGF24 (panel mount) areidentical electrically. Both act as a manual positionerwhen no signal is present on terminal 4. Both act as aminimum positioner when there is a signal on terminal 4(output on terminal 3 is either the control signal or theknob setting, whichever is higher).NM24-SRS US: The highest minimum position signal is 10 VDC.

Blk (1) Common

Red (2) + Hot

Wht (3) Y InputGrn (4) U 2 to 10V Output

NM24-SR US

NM24-SRS US

Ω500Ω

21

8

7 (–)(+)

24 VAC Transformer

SPST

Line Volts

Control Signal

Overide

“Closed” Circuit

Blk (1) Common

Red (2) + Hot


NM24-SR US

NM24-SRS US

c

2

7

7

1

6

(–)(+)

24 VAC Transformer

Line Volts

Control Signal

Blk (1) Common

Red (2) + Hot


NM24-SR US

NM24-SRS US

Overide “Open”Circuit

c

2

9

1

(–)(+)

24 VAC Transformer

Line Volts

Blk (1) CommonRed (2) + HotWht (3) Y InputGrn (4) U 2 to 10V Output

NM24-SR US

NM24-SRS US

Control Signal

SPDT

SGA24SGF24

1 Common2 + Hot3 Output4 Control Input

4

2

1

3



Connect actuator common (wire 1) to negative (–) leg ofcontrol circuits only.

NM24-SR/SRS US: Up to 4 actuators may be connected inparallel. With 4 actuators wired to one 500Ω resistor, a+2% shift of control signal may be required. Power con-sumption must be observed.

NM24-SRS US:The start point and span can be adjusted tosequence multiple actuators from one control signal.Example: controller output 6 to 9 VDC

a. Set the start point to 6 VDCb. Set the working span to 3 VDC (9-6=3 VDC)

The 500Ω resistor converts the 4 to 20 mA control signalto 2 to 10 VDC.

4

5

6

7

8

9

5To otheractuators

Notes:

Special Wiring DiagramsNM24-SR /-SRS US

21

®



SGA24 (NEMA 4 enclosure and SGF24 (panel mount)are identical electrically. Both act as a manual positionerwhen no signal is present on terminal 4. Both act as aminimum positioner when there is a signal on terminal 4(output on terminal 3 is either the control signal or theknob setting, whichever is higher).NM24-SRS US: The highest minimum position signal 10VDC.

Overide circuits are optional. See truth table below.

Input: NM24-SR US - 2 to 10 VDCNM24-SRS US - 0 to 29 VDC (adjustable)

2

2

3

4

5

5

1

1

4

24 VAC Transformer

Line Volts

Control Signal

5Control Signal


NM24-SR US

NM24-SRS US

Overide CircuitNo. 1

c

SPST

34

(–)(+)

1 Common

2 + Hot

3 Output

4 Control Input

SGA24SGF24

Overide CircuitNo.2

c

SPDT

R1

R2

IMPORTANT Observe polarity on secondary of trans-formers. Connect all actuator Wire 1 and Control Signal(–) to one leg of the transformer (bold line) and all actua-tor Wire 2 to the other leg of the transformer. Incorrectpolarity can damage controller or cause erratic operation.

Set reversing switch (L-R) as required by control logic.

When individual transformers are used for each actuator,the hot line from the transformer only goes to one actua-tor. The common wire 1 of all actuators must be wiredtogether.

NM24-SRS:The start point and span can be adjusted tosequence multiple actuators from one control signal.Example: controller output 6 to 9 VDC

a. Set the start point to 6 VDCb. Set the working span to 3 VDC (9-6=3 VDC)

2

6

7

8

9

9

1

68

24 VAC Transformer

Line Volts

To otheractuators

1

8

Line Volts


NM24-SR US

NM24-SRS US

7

(–)(+)


NM24-SR US

NM24-SRS US

Minimum position control with override circuits of NM24-SR/SRS US from a voltage signal and through aSGA24/SGF24 positioner.

Relay R1 Relay R2 Damper PositionDe-energized De-energized Modulates - min. pos.

or control input (Note 3 above)

Energized De-energized Close (0 VDC position)Energized Energized Close (0 VDC position)De-energized Energized Open (max VDC position)

Parallel control of two or more actuators from a voltagesignal using either one transformer for all actuators or indi -vidual transformers for each actuator.

Sp

ecia

l Wirin

gD

iag

ram

s

Notes:

Startup and CheckoutInstructions For NM24-SR/SRS US

22

®

Procedure

Connect signal Input to wires 1 & 3.Connect signal output (if used) towires 1 & 4Connect 24 VAC/VDC power to Wires1 & 2 Note: The NM24-SRS US works with24 VAC only

Check power wiring. Correct anyproblems. Note 1

Turn reversing switch to the correctposition. Make sure the switch isturned all the way left or right. Press“Override Button” all the way downand release

Make sure the control signal positive(+) is connected to Wire No 3 andcontrol signal negative (-) is connect-ed to wire No. 1. Most control prob-lems are caused by reversing thesetwo wires. Verify that the reversingswitch is all the way CCW or CW.

Disconnect signal input from WiresNo. 1 & 3

Check input signal with a digital voltmeter (DVM). Make sure the input iswithin the range of the actuator. ForNM24-SR this is 2 to 10 VDC or4 to 20 mA (with 500Ω resistor). Forthe NM24-SRS US the range will bewhat is set on U0 and ∆U

Disconnect power from Wire No. 2.Reconnect signal input to Wires No. 1& 3. Reconnect power to Wire No. 2

Actuator does not drive

Actuator works properly. Test con-troller by following controller manu-facturer's instructions.

Expected Response

Actuator drives to the “No Signal”position (usually closed), then tothe “Maximum Signal” position(usually open) then to the“Control Signal” position.

Power supply rating should be ≥the total power requirement ofthe actuator(s). Minimum volt-age of 19.2 VAC or 21.6 VDC.


Drives to “Control Signal” posi-tion

Actuator drives to the “No Signal”position

Input voltage or current shouldbe ±1% of what controller'sadjustment or programming indi-cate.


Defective actuator

Actuator RespondsGo To Step ...

Actuator operatesproperlyStep 9

Power wiring correct-ed, actuator begins

to driveStep 1



Step 6

Controller output(actuator input) is

correct. InputPolarity Correct.

Step 7


No ResponseGo To Step

No response at allStep 2

Operation isreversedStep 3

Does not drivetoward "ControlSignal Position"

Step 4

Power wiringcorrected, actuatorstill does not drive

Step 8

Does not drivetoward “ControlSignal Position”

Step 4

Step 5

Step 8

Reprogram, adjustrepair or replace

controller as needed.Step 7

Step 8

Replace actuator

Step

1.

2.

3.

4.

5.

6.

7.

8.

9.

Note 1 Check that the transformer(s) are sized properly. • If a common transformer is used, make sure that polarity is observed on the secondary. This means connect all No. 1

wires to one leg of the transformer and all No. 2 wires to the other leg of the transformer. • If multiple transformers are used with one control signal, make sure all No. 1 wires are tied together and tied to control

signal negative (-).• Controllers and actuators must have separate 24 VAC/VDC power sources.

NM24-SR/SRS US

23

Startup and CheckoutInstructions For NM24-PWM US

Procedure

Connect signal Input to wires 1 & 3.Connect signal output (if used) towires 1 & 4Connect 24 VAC power to Wires 1 & 2 Note: The NM24-PWM US works with24 VAC only

Check power wiring. Correct anyproblems. Note 1

Turn reversing switch to the correctposition. Make sure the switch isturned all the way left or right. Press“Override Button” all the way downand release

Make sure the control signal is con-nected to Wire No. 3 and control sig-nal common is connected correctly.Most control problems are caused byreversing these two wires. Verify thatthe reversing switch is all the wayCCW or CW.

Disconnect power from wire No. 2.Disconnect the signal input from wiresNo.1 and 3. Reconnect power to wireNo. 2. If not already on, switch thepulse length selector to the 0.1 to25.5 second range. Touch wiresNo.1 and 3 together for approximately13 seconds and then break the con-nection.

Set range selector to original selection.Disconnect power from Wire No. 2.Reconnect signal input to Wires No. 1& 3. Reconnect power to Wire No. 2

Actuator does not drive

Actuator works properly. Test con-troller by following controller manu-facturer's instructions.

Expected Response

Actuator drives to the “Zero PulseLength” position (usually closed),then to the “Maximum PulseLength” position (usually open)then to the “Control” position.Note No. 2

Power supply rating should be ≥the total power requirement ofthe actuator(s). Minimum volt-age of 19.2 VAC.

Actuator drives to the “Zero PulseLength” position (usually closed),then to the “Maximum PulseLength” position (usually open)then to the “Control” position.

Drives to “Control” position

Actuator drives to the “Zero PulseLength” position (usually closed),then to the “Maximum PulseLength” position (usually open)then rotates to approximately the50% position.

Actuator drives to the “Zero PulseLength” position (usually closed),then to the “Maximum PulseLength” position (usually open)then to the “Control” or zeroposition.

Defective actuator

Actuator RespondsGo To Step ...


If at “zero pulselength” position

Step 5

Power wiring correct-ed, actuator begins

to driveStep 1




Step 6

No ResponseGo To Step

No response at allStep 2

Operation isreversedStep 3

Does not drivetoward "Control

Position" Step 4

Power wiringcorrected, actuatorstill does not drive

Step 8

Does not drivetoward “ControlSignal Position”

Step 7

Step 5

Step 7

Step 2

Replace actuator

Step

1.

2.

3.

4.

5.

6.

7.

8.

Note 1 Check that the transformer(s) are sized properly. • If a common transformer is used, make sure that polarity is observed on the secondary. This means connect all No. 1

wires to one leg of the transformer and all No. 2 wires to the other leg of the transformer. • If multiple transformers are used with one control signal, make sure all No. 1 wires are tied together and tied to control

signal negative (-).• Controllers and actuators must have separate 24 VAC power sources.

Note 2 • If no pulse is given, the control position will be the “zero pulse length” position.

NM24-PWM US

CH

EC

K-O

UT

®

Non-Direct Mounting Methods

24

®

Actuator mounted on a field-fabricated 16 ga. plate to con -trol a cone-type VAV damperUniversal mounting bracket or a field-fabricated 16 ga.

angle iron or plate. Used when there is little clearancebetween the damper shaft and the wall.

Use this method when there is little clearance between thedamper shaft and the wall.

Damper is mounted through a wallwith control shaft exposed, butspace too tight to direct couple.

KH-8 Crankarm - finalposition must be verticalwhen damper is fullyopen.

Mount actuator ata 45° angle toallow for full 90°crankarm rotation.

ZG-NM3

ZG-NM3

ZG-105

NM24…

ZG-NM4

NM24…

NM24…

®

Simply the best way to drive a damper™

Subject to change 3.30199

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OverviewDoc. 1.0 Product Guide and Company Profile

Spring Return ActuatorsDoc. 2.1 AF Series, 133 in-lb Doc. 2.2 NF Series, 60 in-lb Doc. 2.3 LF Series, 35 in-lb

Non-Spring Return ActuatorsDoc. 3.1 GM Series, 266 in-lbDoc. 3.2 AM Series, 166 in-lbDoc. 3.3 NM Series, 70 in-lbDoc. 3.4 LM Series, 35 in-lb

AccessoriesDoc. 4.1 Electronic Accessories Doc. 4.2 Mechanical Accessories

Application InformationDoc. 5.1 Mounting Methods GuideDoc. 5.2 Wiring GuideDoc. 5.3 Damper Applications GuideDoc. 5.4 Pneumatic vs Electric ActuationSubmittal Sheets AF, NF, LF, GM, AM, NM, LM

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