BM0-D8 - Volume flow Modbus/BACnet Daisy Chain (for Ox)

VAV control component suitable for TROX Oₓ

Optimised for connection to the Field Application Module of the TROX Oₓ system platform

BM0-D8 - VOLUME FLOW MODBUS/BACNET DAISY CHAIN (FOR OX)

Control component with dynamic transducer, Modbus RTU, BACnet MS/TP and double RJ45 connection (daisy-chain wiring) suitable for TROX Ox

Compact unit for VAV terminal unit TVR, TVJ, TVT, TZ-Silenzio, TA-Silenzio, TVZ, TVA, TVM
■ Controller, dynamic differential pressure transducer and actuator in one casing
■ Use in ventilation and air conditioning systems, only with clean air
■ Double RJ45 connection for simple daisy-chain wiring of supply voltage and communication
■ Compatible with field application modules from TROX Oₓ , e.g. FAM-E and FAM-W
■ Volume flow rates qvmin and qvmax are pre-set in the factory and saved in the controller as variable parameters
■ High data transparency thanks to standardised bus communication Modbus RTU or BACnet MS/TP
■ Setpoint specification, override control and parameter adjustment via bus communication or TROX Oₓ Field Application Module
■ Service access for manual adjustment devices and PC configuration software

General information

Application

All-in-one control devices for VAV terminal units
Dynamic differential pressure transducer, electronic controller, and actuator are combined in one casing
Different control tasks through corresponding setpoint specification
Room temperature controllers, central building management systems, air quality controllers and others control the variable volume flow control by specifying setpoints via the communication interface
Suitable for room control from TROX Oₓ with Field Application Modules, e.g. FAM-E, FAM-W
Simple connection thanks to common connection for supply voltage and communication via double RJ45 socket (daisy-chain wiring possible)
Up to four volume flow controllers can be connected in series via daisy-chain wiring
Override control for activating qvmin, qvmax, shut-off, Open position via Modbus register, BACnet objects or TROX Oₓ possible
The actual volume flow rate is available as a network data point
The damper blade position is available as a network data point
Standard filtration in comfort air conditioning systems allows the controller to be used in the supply air without additional dust protection measures

With heavy dust levels in the room

Install suitable extract air filters upstream, as a partial volume flow is routed through the transducer for volume flow measurement

If the air is contaminated by dust, lint, or sticky particles

Use a control component with static differential pressure transducer, e.g. BUSN

Control strategy

The volume flow controller works independently of duct pressure
Pressure fluctuations do not cause any permanent volume flow deviations
A dead zone (hysteresis), within which the damper blade is not moved, ensures stable regulation
The volume flow range for the controller is factory-set (qvmin: minimum volume flow rate, qvmax: maximum volume flow rate)
Operating parameters are defined in the order code and factory-set

Operating modes

Modbus RTU: Setpoint specification via TROX Oₓ or external software
BACnet MS/TP: Setpoint specification via external software

Interface

Communication interface

Modbus RTU, RS485 (factory-set)
BACnet MS/TP (can be activated on site with ZTH-EU)
Data points, see bus lists

Parts and characteristics

Transducer for dynamic pressure measurements
Overload-proof actuator
Dual RJ45 connector
Service interface for service tools
Shaft connection via clamping device or positive locking
Indicator lights for operating status indication
Addressing button for setting participant addresses in bus mode
Power supply and communication not galvanically isolated

Operating parameters

qvmin = 0 – 100% of the nominal volume flow qvnom can be set
qvmax = 20 – 100% of the nominal volume flow qvnom can be set

Construction

Type LMV-D3-M/B-FX TR for volume flow controller

Type LMV-D3-M/B-X TR for volume flow controllers

TZ-Silenzio, TA-Silenzio, TVZ, TVA, TVM

Type NMV-D3-M/B-X TR for volume flow controllers

TVJ
TVT up to 1000x300 or 800x400

Commissioning

As the volume flow rates are factory-set, the air terminal units must be installed only at the designated locations
Network integration requires commissioning steps
Operating parameters can be adjusted by the client (service tool ZTH-EU)

Useful additions

Adjustment device type ZTH (order code AT-VAV-B)
PC software e.g. Belimo PC-Tool or Belimo Assistant App (requires interface converter)

Technical information

1 Differential pressure transducer
2 Actuator
3 Volume flow controller
4 Setpoint signal

Air volume flow controllers are characterised by a closed-loop control system for the regulation of air volume flow, comprising measurement, comparison and actuation.
The volume flow is obtained by measuring a differential pressure.
This is done via a differential pressure sensor. The integrated differential pressure transducer converts the differential pressure into a voltage signal. The actual volume flow rate is available as a voltage signal. Due to factory settings, 10 V DC always corresponds to the nominal volume flow (qvnom).
The volume flow setpoint is specified by a higher-level controller (e.g. room temperature controller, air quality controller, building management system). Variable volume flow control can be set between qvmin and qvmax. It is possible to override the room temperature control by override control, e.g. via a shut-off.
The controller compares the volume flow setpoint to the current actual value and controls the actuator according to the system deviation.

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

Category

Compact controller for volume flow rate

Application

Control of a constant or variable volume flow setpoint
Electronic controller for applying a setpoint and acquiring an actual value for integration into a Modbus RTU or BACnet MS/TP-based management and control equipment (MCE)
The actual value is referenced to the nominal volume flow, simplifying commissioning and subsequent adjustment

Area of application

Dynamic transducer for clean air in ventilation and air conditioning systems

Actuator

Integrated; slow-running (travel time approx. 120 – 150 s for 90°)

Installation orientation

Either direction

Connection

2x connector socket RJ45, for daisy-chain wiring for up to 4 control components; particularly suitable for TROX Oₓ field modules

Supply voltage

24 V AC/DC

Interface/signalling

Modbus RTU (RS-485)
BACnet MS/TP
Power supply and communication not galvanically isolated
Switchable termination

Interface information

Modbus Register
BACnet objects
Volume flow setpoint and actual value, damper blade position, error status, etc.

System connections

Modbus-RTU / BACnet-MS/TP connection for optional expansions, e.g. TROX Oₓ

Special functions

Activation of Vmin, Vmax, Closed, Open via Modbus register or BACnet object

Operating modes that can be activated as an option

Open loop: actuators with airflow rate measurement

Parameter setting

Für VVS-Regelgerät spezifische Parameter werkseitig parametriert
Betriebswerte Vmin, Vmax und Schnittstellentyp werkseitig parametriert
Nachträgliche Anpassung mittels Modbus- / BACnet Buszugriff oder TROX Ox System Controller oder optionalen Tools (Einstellgerät, PC-Software jeweils kabelgebunden)

Factory condition

Functional test under air using reference measurement on a regularly validated test rig in accordance with DIN EN ISO 9001 to check the function and control accuracy of the complete volume flow controller
Adjustment of the device-specific parameters under air by reference measurement on a regularly validated test rig if in accordance with DIN EN ISO 9001
The test report of the factory parameterisation, functional test and adjustment must be made available after delivery of the volume flow controller

Equivalence criteria

The test report of the factory parameterisation, functional test and adjustment under air by reference measurement on a regularly validated test rig in accordance with DIN EN ISO 9001 is provided

TVR

–

250

BM0-D8

500 – 1200 [m³/h]

1 Type

TVR VAV terminal unit

2 Acoustic cladding

No entry: without acoustic cladding

D with acoustic cladding

3 Material

No entry: galvanised sheet steel

P1 Surface powder-coated, RAL 7001 (silver grey)

A2 Stainless steel variant

4 Air duct connection

No entry: push-fit end for air ducts according to DIN EN 1506; with groove for optional seal

FL Flange on both sides (not for TVR-D-P1 or TVR-D-A2)

5 Nominal size [mm]

100, 125, 160, 200, 250, 315, 400

6 Accessories

No entry: without accessories

D2 Double lip seal on both ends

G2 Matching flanges on both ends

7 Attachment (control component)

BM0-D8 Compact controller with dynamic transducer and Modbus RTU bus interface as well as 2 RJ45 connection sockets for TROX Oₓ

8 Operating mode

V variable operation (adjustable setpoint range)

9 Operating values for factory setting

Volume flow rate [m3/h or l/s]

qᵥmin – qᵥmax

Order example: TVR-D-P1/250/D2/BM0-D8/V/500-1200[m³/h]

Type	TVR – VAV terminal unit
Acoustic cladding	with acoustic cladding
Material	Surface powder-coated, RAL 7001 (silver grey)
Air duct connection	Push-fit end, suitable for air ducts according to EN 1506; with groove for optional lip seal
Nominal size [mm]	250
Accessories	Double lip seal on both ends
Attachments (control component)	BM0-D8 - Compact controller with dynamic transducer and Modbus RTU bus interface as well as 2 RJ45 connection sockets for TROX Oₓ
Operating state	variable operation (adjustable setpoint range)
Operating values for factory setting	500 – 1200 [m3/h]

Compact controller for VAV terminal units

VAV terminal units	Type of attachment	Part number
TVR1	LMV-D3-M/B-FX TR	P0012126
TVR2, TZ-Silenzio, TA-Silenzio, TVZ, TVA	LMV-D3-M/B-X TR	P0012124
TVM	2x LMV-D3-M/B-X TR	P0012124
TVJ, TVT	NMV-D3-M/B-X TR	P0012125

TVR Initial equipment
TVR Spare part

Compact controller BM0-D8, type LMV-D3-M/B-X TR (clamping bracket)

Compact controller BM0-D8, Typ LMV-D3-M/B-FX TR (positive locking)

Compact controller BM0-D8, LMV-D3-M/B-X TR (clamping bracket) and LMV-D3-M/B-FX TR (positive locking)

Measuring principle / installation orientation	dynamic measuring principle, independent of position
Rated voltage	24 V AC/DC
Rated voltage (frequency)	50/60 Hz
Functional range	AC 19.2 – 28.8 V/DC 21.6 – 28.8 V
Power consumption – operating/standby	2 W/1 W
Power consumption – sizing/inrush current	4 VA 8.0 A @ 5 ms
Bus connection	Interface RS485 – protocol Modbus** RTU, BACnet MS/TP
Modbus RTU communication parameters to be set	Baud rate: 9600, 19200, 38400, 76800, 115200; Address: 1, 2, 3 – 247; Parity: 1-8-N-2**, 1-8-N-1, 1-8-E-1, 1-8-O-1; Number of nodes: max. 32 (without repeater) Termination resistor: 120 Ω;
BACnet MS/TP communication parameters to be set	Baud rate: 9600, 19200, 38400, 76800, 115200; Address: 0,1, 2, 3 – 127; Number of nodes: max. 32 (without repeater) Termination resistor: 120 Ω;
Addressing	required on site: e.g. adjustment device ZTH-EU or external software
Bus termination	internal connection resistor 120 Ω can be activated
Maximum bus structure daisy-chain wiring	Loop-through: maximum 4 control components type BM0-D8, Distance between two control components: maximum 3 m Total cable length: maximum 40 m
Torque	5 Nm
Setpoint/actual value interface	via Modbus register access, e.g. via TROX Oₓ field module alternatively via BACnet objects
Connections	RJ45-Doppelanschlussbuchse ungeschirmt, maximal 1 A / 20 W pro Strang Verkabelung: ungekreuztes Patchkabel AWG24 nach TIA T586A
IEC protection class	III (protective extra-low voltage)
Protection degree (IP code)	IP 20
Weight	0.55 kg
EC conformity	EMC according to 2014/30/EU

**Factory setting

Compact controller BM0-D8, NMV-D3-M/B-X TR (clamping bracket)

Compact controller BM0-D8, type NMV-D3-M/B-X TR (clamping bracket)

Measuring principle / installation orientation	dynamic measuring principle, independent of position
Rated voltage	24 V AC/DC
Rated voltage (frequency)	50/60 Hz
Functional range	AC 19.2 – 28.8 V/DC 21.6 – 28.8 V
Power consumption – operating/standby	3 W/1.5 W
Power consumption – sizing/inrush current	4 VA 8.0 A @ 5 ms
Bus connection	Interface RS485 – protocol Modbus** RTU, BACnet MS/TP
Modbus RTU communication parameters to be set	Baud rate: 9600, 19200, 38400, 76800, 115200; Address: 1, 2, 3 – 247; Parity: 1-8-N-2**, 1-8-N-1, 1-8-E-1, 1-8-O-1; Number of nodes: max. 32 (without repeater) Termination resistor: 120 Ω;
BACnet MS/TP communication parameters to be set	Baud rate: 9600, 19200, 38400, 76800, 115200; Address: 0,1, 2, 3 – 127; Number of nodes: max. 32 (without repeater) Termination resistor: 120 Ω;
Addressing	required on site: e.g. adjustment device ZTH-EU or external software
Bus termination	internal connection resistor 120 Ω can be activated
Maximum bus structure daisy-chain wiring	Loop-through: maximum 4 control components type BM0-D8 Distance between two control components: maximum 3 m Total cable length: maximum 40 m
Torque	10 Nm
Setpoint/actual value interface	via Modbus register access, e.g. via TROX Oₓ field module alternatively via BACnet objects
Connections	RJ45-Doppelanschlussbuchse ungeschirmt, maximal 1 A / 20 W pro Strang Verkabelung: ungekreuztes Patchkabel AWG24 nach TIA T586A
IEC protection class	III (protective extra-low voltage)
Protection degree (IP code)	IP 20
Weight	0.83 kg
EC conformity	EMC according to 2014/30/EU

**Factory setting

Downloads

product information

Product data sheet BM0-D8

BM0-D8_PD_2026_03_23_DE_en Product data sheet 10 MB pdf

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