Belimo NM24A-MOD Technical Data Sheet

Communicative damper actuator
for adjusting dampers in technical
building installations

• Torque motor 10 Nm

• Nominal voltage AC/DC 24 V

• Control modulating, communicative,
hybrid mode

• Conversion of sensor signals

• Communication via BACnet MS/TP,
Modbus RTU, Belimo-MP-Bus or
conventional control

Technical data

Electrical data Nominal voltage AC/DC 24 V

Functional data

Safety

Technical data sheet NM24A-MOD

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 3.5 W
Power consumption in rest position 1.4 W
Power consumption for wire sizing 6 VA
Connection supply / control Cable 1 m, 6 x 0.75 mm²

Nominal torque Min. 10 Nm
Torque variable 25%, 50%, 75% reduced
Communicative control BACnet MS/TP

Modbus RTU (ex works)

MP-Bus
Operating range Y DC 2...10 V
Operating range Y variable DC 0.5...10 V
Position feedback U DC 2...10 V
Position feedback U note Max. 1 mA
Position feedback U variable Start point DC 0.5...8 V

End point DC 2...10 V
Position accuracy ±5%
Direction of motion motor selectable with switch 0 / 1
Direction of motion note Y = 0%: At switch position 0 for ccw rotation or

1 for cw rotation, respectively
Direction of motion variable electronically reversible
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°
Running time motor variable 43...173 s
Adaption setting range manual
Adaption setting range variable No action

Adaption when switched on

Adaption after pushing the gear disengagement

button
Override control, controllable via bus
communication

Override control variable MAX = (MIN + 32%)...100%

Sound power level Motor 35 dB(A)
Damper spindle Universal spindle clamp 8...26.7 mm
Position indication Mechanically, pluggable

Protection class IEC/EN III Safety Extra-Low Voltage (SELV)
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 2014/30/EU
Certification IEC/EN IEC/EN 60730-1 and IEC/EN 60730-2-14

MAX (maximum position) = 100%

MIN (minimum position) = 0%

ZS (intermediate position) = 50%

MIN = 0%...(MAX – 32%)

ZS = MIN...MAX

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NM24A-MOD

Technical data

Safety notes

Damper actuator, modulating
communicative
hybrid mode, AC/DC 24 V, 10 Nm,

Safety Certification UL cULus according to UL60730-1A, UL60730-2-

14 and CAN/CSA E60730-1:02
Mode of operation Type 1
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 Max. 95% r.h., non-condensing
Maintenance Maintenance-free

Weight

Weight 0.92 kg

• The device must not be used outside the specified field of application, especially not

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 actuator and that is ensured that the
ambient conditions remain at any time within the thresholds according to the data
sheet.

• 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 site 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

Mode of operation

Converter for sensors

Parameterisable actuators

Combination analogue - communicative

(hybrid mode)

Simple direct mounting

Manual override

Adjustable angle of rotation

High functional reliability

The actuator is fitted with an integrated interface for BACnet MS/TP, Modbus RTU and
MP-Bus. It receives the digital positioning signal from the control system and returns
the current status.

Connection option for a sensor (passive, active or with switching contact). In this way,
the analogue sensor signal can be easily digitised and transferred to the bus systems
BACnet, Modbus or MP-Bus.

The factory settings cover the most common applications. Single parameters can be
modified with the Belimo Service Tools MFT-P or ZTH EU.
The communication parameters of the bus systems (address, baud rate etc.) are set
with the ZTH EU. Pressing the “Address” button on the actuator while connecting the
supply voltage, resets the communication parameters to the factory setting.
Quick addressing: The BACnet and Modbus address can alternatively be set using
the buttons on the actuator and selecting 1 to 16. The value selected is added to the
«Basic address» parameter and results in the effective BACnet and Modbus address.

With conventional control by means of an analogue positioning signal, BACnet or
Modbus can be used for the communicative position feedback

Simple direct mounting on the damper spindle with an universal spindle clamp,
supplied with an anti-rotation device to prevent the actuator from rotating.

Manual override with push-button possible (the gear 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.

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NM24A-MOD

Product features

Home position

Damper actuator, modulating
communicative
hybrid mode, AC/DC 24 V, 10 Nm,

The first time the supply voltage is switched on, i.e. at the time of commissioning, the
actuator carries out a synchronisation. The synchronisation is in the home position
(0%).
The actuator then moves into the position defined by the positioning signal.

Adaption and synchronisation

Accessories

Electrical accessories

Mechanical accessories

0

1

Y = 0%

Y = 0%

ccw

cw

An adaption can be triggered manually by pressing the “Adaption” button or with the
PC-Tool. Both mechanical end stops are detected during the adaption (entire setting
range).
Automatic synchronisation after pressing the gearbox disengagement button is
configured. The synchronisation is in the home position (0%).
The actuator then moves into the position defined by the positioning signal.
A range of settings can be adapted using the PC-Tool (see MFT-P documentation)

Description Type

Auxiliary switch, add-on, 1 x SPDT S1A

Auxiliary switch, add-on, 2 x SPDT S2A
Feedback potentiometer 140 Ohm, add-on P140A
Feedback potentiometer 140 Ohm, add-on, grey P140A GR
Feedback potentiometer 200 Ohm, add-on P200A
Feedback potentiometer 500 Ohm, add-on P500A
Feedback potentiometer 500 Ohm, add-on, grey P500A GR
Feedback potentiometer 1 kOhm, add-on P1000A
Feedback potentiometer 1 kOhm, add-on, grey P1000A GR
Feedback potentiometer 2.8 kOhm, add-on P2800A
Feedback potentiometer 2.8 kOhm, add-on, grey P2800A GR
Feedback potentiometer 5 kOhm, add-on P5000A
Feedback potentiometer 5 kOhm, add-on, grey P5000A GR
Feedback potentiometer 10 kOhm, add-on P10000A
Feedback potentiometer 10 kOhm, add-on, grey P10000A GR
Connecting cable 5 m, A+B: RJ12 6/6, To ZTH EU ZK1-GEN
Connection cable 5 m, A: RJ11 6/4, B: Free wire end, To ZTH EU ZK2-GEN

Description Type

Actuator arm, for one-sided spindle clamp K-ENSA AH-25

Shaft extension 240 mm, for damper spindles Ø 8...25 mm or Ø

10...25 mm

Angled ball joint with M8, suitable for damper crank arm KH8 KG8
Straight ball joint with M8, suitable for damper crank arm KH8 KG10A
Damper crank arm, for damper spindles KH8
Spindle clamp, one side for NM..A K-ENMA
Spindle clamp, one side for NM..A, SM..A K-ENSA
Spindle clamp, reversible for NM..A and LMQ.. K-NA
Form fit insert 8x8 mm, for NM..A ZF8-NMA
Form fit insert 10x10 mm, for NM..A / SM..A ZF10-NSA
Form fit insert 12x12 mm, for NM..A / SM..A ZF12-NSA
Form fit insert 15x15 mm, for NM..A / SM..A ZF15-NSA
Form fit insert 16x16 mm, for NM..A / SM..A ZF16-NSA
Mounting kit for linkage operation, NM..A for flat installation ZG-NMA
Anti-rotation mechanism 180 mm Z-ARS180
Base plate extension from NM..A to NM.. Z-NMA
Position indication for LM..A, NM..A, SM..A, GM..A Z-PI

AV8-25

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Accessories

Service Tools

Electrical installation

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Wiring diagrams

BACnet MS/TP / Modbus RTU

Damper actuator, modulating
communicative
hybrid mode, AC/DC 24 V, 10 Nm,

Description Type

Service tool for parametrisable and communicative Belimo actuators /
VAV controller and HVAC performance devices

Belimo PC-Tool, software for adjustments and diagnostics MFT-P
Adapter to Service Tool ZTH MFT-C

Notes • Connection via safety isolating transformer.

• The wiring of the line for BACnet MS/TP / Modbus RTU is to be carried out in
accordance with applicable RS485 regulations.

• Modbus / BACnet: Supply and communication are not galvanically isolated.
Connect earth signal of the devices with one another.

ZTH EU

D –
D

+

3

T

+

–

AC/DC 24 V

~

12

5

67

D

+

D –

T

–

AC/DC 24 V

12

~

+

Connection with passive sensor, e.g. Pt1000, Ni1000, NTC

T

~

+

–

D–
D+

12

3

5

MFT

67

D

D –

Ni1000

–28...+98°C

PT1000

NTC

–35...+155°C

–10...+160°C

+

850...1600 Ω

850...1600 Ω

1)

200 Ω...60 kΩ

2)

2)

2)

Connection with active sensor, e.g. 0...10 V @ 0...50°C

T

~

+

–

D-

D+

3

5

67

D

D –

1) depending on type

2) Resolution 1 Ohm

Cable colours:
1= black
2 = red
3 = white
5 = orange
6 = pink
7 = grey

+

Signal assignement Modbus:
C1 = D– = A
C2 = D+ = B

3

12

4

5

MFT

67

D

+

D -

Possible voltage range:

0...32 V (resolution 30 mV)

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V

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NM24A-MOD

Damper actuator, modulating
communicative
hybrid mode, AC/DC 24 V, 10 Nm,

Electrical installation

Connection with switching contact, e.g. Δp monitor

T

~

+

–

D­D+

∆p

3

12

5

MFT

67

D

+

D -

Modbus RTU / BACnet MS/TP with analog setpoint (hybrid mode)

D+
D-

AC/DC 24 V

3

12

T

~

+

–

5

67

D+

D-

Y
U

DC (0)2…10
DC 2…10 V

Requirements for switching contact:
The switching contact must be able
to accurately switch a current of 16
mA @ 24 V.

Operation on the MP-Bus

T

+

–

Y
U

12356D-7

MFT

D+

Sensor
MP

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Operating controls and indicators

0

1

1

Adaption

Address

4

5

2

Power

3

Status

Damper actuator, modulating
communicative
hybrid mode, AC/DC 24 V, 10 Nm,

1

Direction of rotation switch

Switch over: Direction of rotation changes

2

Push-button and LED display green

Off:
On:
Flashing:

Press button:

3

Push-button and LED display yellow

Off:
On:

Flickering:
Press button:

4

Gear disengagement button

Press button:
Release button:

5

Service plug

For connecting parameterisation and service tools

Check power supply connection

2

Off and 3 On

No power supply or malfuntion
In operation
In address mode: Pulses according to set address (1...16)
When starting: Reset to factory setting (Communication)
In standard mode: Triggers angle of rotation adaptation
In address mode: Confi rmation of set address (1...16)

Standard mode
Adaptation or synchronising process active
or actuator in address mode (LED display green fl ashing)
BACnet / Modbus communication active
In operation (>3 s): Switch address mode on and off
In address mode: Address setting by pressing several times
When starting (>5 s): Reset to factory setting (Communication)

Gear disengages, motor stops, manual override possible
Gear engages, synchronisation starts, followed by standard mode

Possiple wiring error in power supply

Service

Quick adressing

Service Tools connection

1. Press the “Address” button until the green “Power” LED is no longer illuminated.
LED flashes in accordance with the previously set address.

2. Set the address by pressing the “Address” button the corresponding number of
times (1-16).

3. The green LED flashes in accordance with address that has been entered (1-16). If
the address is not correct, then this can be reset in accordance with Step 2.

4. Confirm the address setting by pressing the green “Adaption” button.
If no confirmation occurs for 60 seconds, then the address procedure is ended. Any
address change that has already been started will be discarded.
The resulting BACnet MS/TP and Modbus RTU address is made up of the set basic
address plus the short address (e.g. 100+7=107).

The actuator can be parameterised by ZTH EU via the service socket.
For an extended parameterisation the PC tool can be connected.

T

~

AC 24 V

+

–

DC 24 V

MP USB

ZTH EU

esc OK



12

i

3

5

67

MFT

D

+

D –

USB



BELIMO
PC-Tool

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NM24A-MOD

Dimensions [mm]

Spindle length

Damper actuator, modulating
communicative
hybrid mode, AC/DC 24 V, 10 Nm,

Dimensional drawings

L

Min. 40

Min. 20

8...26.7 ≥8 ≤26.7

*

8...20 ≥8 ≤20

*Option: Spindle clamp mounted below
(accessories K-NA needed)

Further documentation

62

124

• Tool connections

• Description Protocol Implementation Conformance Statement PICS

• Description Modbus register

• Overview MP Cooperation Partners

• MP Glossary

• Introduction to MP-Bus Technology

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