BUDN

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X-AIRCONTROL zone module MP-bus

CONTROL COMPONENT WITH DYNAMIC TRANSDUCER AND SEPARATE ACTUATOR FOR VAV TERMINAL UNITS

Universal device for use with VAV terminal units

Controller and dynamic differential pressure transducer in one casing
Separate actuator with simple plug connection
Use in ventilation and air conditioning systems, only with clean air
Suitable for constant and variable volume flow rates
Activation of override controls via external wiring
Volume flow rates qvmin and qvmax are set in the factory and saved in the controller
Modification of operating parameters by PC software as well as smartphone and tablet app (TROX FlowCheck app)
Service access for PC configuration software
Smartphone access via NFC interface and Bluetooth
Setpoint value settings, override controls and parameter adjustment via analogue interface or bus communication
High data transparency through standardised bus communication MP-Bus, Modbus RTU or BACnet MS/TP

General information

Application

All-in-one control device for VAV terminal units
Dynamic differential pressure transducer and control electronics in one casing
Separate actuator with prefabricated connection plug
For use only with clean air
Standard filtration in comfort air conditioning systems allows for use of the controller in the supply air without additional dust protection.
Suitable for different control tasks depending on the specification of the setpoint value
The room temperature controller, central BMS, air quality controller or similar units control the variable volume flow control by specifying the setpoint values via a communication interface or analogue signal
Override controls for activating qvmin, qvmax, shut-off, OPEN position via MP-Bus data points or Modbus/BACnet register or switch/relay possible
Volume flow rate actual value is available as a network data point or linear voltage signal
Damper blade position is available as a network data point
Use TROX FlowCheck app and PC tool to configure the controller and the communication parameters

With heavy dust levels in the room

Install appropriate exhaust air filters upstream, as a partial volume flow is routed through the transducer for volume flow rate measurement.

If the air is additionally contaminated, e.g. with fluff or sticky components

Use of the BUSN attachment group instead of the BUDN universal controller described here

Control strategy

The volume flow controller works independent of the duct pressure
Differential pressure fluctuations do not result in permanent volume flow rate changes
To prevent the control from becoming unstable, a dead band is allowed within which the damper blade does not move.
Volume flow rate range in the controller set in the factory
qvmin: minimum volume flow rate
qvmax: maximum volume flow rate
Operating parameters are specified via the order code and set in the factory

Interface

Analogue interface

Analogue interface with adjustable signal voltage range
Analogue signal for volume flow rate setpoint
Analogue signal for actual volume flow rate

Digital communication interface (Bus)

MP bus
Modbus RTU, RS485
BACnet MS/TP, RS485
Data points, see bus lists

Hybrid mode

Mixed mode of analogue and digital interface

Factory setting

Setpoint value setting via analogue interface
Actual value output via analogue interface and Modbus communication interface

Operating modes

Variable operation (V)

Setpoint value setting via analogue signal, Modbus, BACnet or MP-BusWork area corresponds to qvmin – qvmax

Constant value mode (F)

A setpoint signal is not required, setpoint value corresponds to qvmin

Operating parameters

Volume flow rate range in the controller set in the factory
qvmin: minimum volume flow rate
qvmax: maximum volume flow rate
qvmin = 0 – 100 % of the nominal volume flow rate qvnom adjustable
qvmax= 20 – 100 % of the nominal volume flow rate qvenn adjustable

Signal voltage ranges

0 – 10 V DC
2 – 10 V DC

Parts and characteristics

Transducer for dynamic measurement principle
Separate overload protection
Plug-in terminal for supply line and controls including cover
Socket for the actuator
NFC and service interface
Release button to allow for manual operation
Indicator lights for displaying the operating mode
Addressing key for setting user addresses in bus mode
Controller casing prepared with 4 openings for threaded connections, 2 cable glands M16x1.5 for connecting cable in the supply package

Construction

BUDN with actuator LM24A-VST for:

TVR, TZ-Silenzio, TA-Silenzio, TVZ, TVA,

BUDN with actuator NM24A-VST for:

TVJ
TVT up to dimensions of 1000 × 300 or 800 × 400

BUDN with actuator SM24A-VST for:

TVT from dimensions of 800 × 500 to 1000 × 600

Commissioning

Due to the volume flow rates set in the factory, always ensure that the control units are only installed in the specified locations
Modbus/BACnet/MP bus interface: additional commissioning steps required
Operating parameters can be adjusted using the TROX FlowCheck app

Useful additions

TROX FlowCheck app for Android and iOS
Adjustment device type ZTH-EU (order code AT-VAV-B)
Belimo PC-Tool
NFC Bluetooth converter ZIP-BT-NF
X-AIRCONTROL zone modules for room control

Technical information

Function, Technical data, Specification text, Order code

Principle of operation Universal controller: TVR, TVJ, TVT, TZ-/TA-Silenzio, TVZ, TVA, TVRK XD4_gc_01ai.ai.link

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

A closed control circuit for regulation of the volume flow rate, i.e. measuring - comparing - adjusting, is characteristic of air terminal units. The volume flow rate is measured by measuring a differential pressure (effective pressure). This is done via a differential pressure sensor. An integrated differential pressure transducer converts the effective pressure into a voltage signal. The volume flow rate actual value is available as a voltage signal. The factory setting is such that an actual output signal of 10 V DC always corresponds to the nominal volume flow rate (qvnom). The volume flow rate setpoint value is specified by a higher-level controller (e.g. room temperature controller, air quality controller, central BMS). Variable volume flow control results in a value between qvmin and qvmax. It is possible to override the room temperature control by override controls, e.g. by a complete shutoff of the duct. The controller compares the volume flow rate setpoint value to the actual value and controls the external actuator accordingly to the system deviation.

Universal controller for VAV terminal units

–	Controllers		Actuator		–
Order code detail	Part number	Type	Part number	Type	VAV terminal units
BUDN	A00000073650	VRU-D3-M/B TR	A00000076423	LM24A-VST TR	①
BUDN	A00000073650	VRU-D3-M/B TR	A00000073640	NM24A-VST TR	②
BUDN	A00000073650	VRU-D3-M/B TR	A00000073642	SM24A-VST TR	③

① TVR, TZ-Silenzio, TA-Silenzio, TVZ, TVA.

② TVJ, TVT up to dimensions of 1000 × 300 or 800 × 400.

③ TVT dimensions from 800 × 500 to 1000 × 600.

Universal controller, type VRU-D3-M/B TR

Measurement principle	dynamic transducer type, independent of position
Nominal voltage	AC/DC 24 V
Nominal frequency	50/60 Hz
Functional range	19,2 – 28,8 V AC oder 21,6 – 28,8 V DC
Power requirement (operation/resting state)	1.5 W
Power rating	2 VA
Power rating - note	I_max 20 A @ 5 ms
Actuator connection	AC/DC supply from controller, PP link VST drive
Bus connection	*Modbus RTU,** BACnet MS/TP, MP-Bus
Adjustable communication parameters with Modbus RTU	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) Terminal resistor: 120 Ω;
Adjustable communication parameters with BACnet MS/TP	Baud rate: 9600, 19200, 38400, 76800, 115200; Address: 1,2.3 – 127; Number of nodes: max. 32 (without repeater) Terminal resistor: 120 Ω;
Addressing	Required on-site: through TROX FlowCheck app
Setpoint value signal input (analogue optional)	0 – 10 V, 2 – 10 V Input resistance 100 kΩ
Actual value signal output	0 – 10 V, 2 – 10 V, max. 0.5 mA
IEC/EN protection class	III (protective extra-low voltage)
Protection level	IP 42
EMC	CE according to 2014/30/EU

* Factory setting.

Actuator LM24A-VST TR

Supply voltage	From the controller
Power consumption – when running	1 W
Power rating	2 VA
Self-consumption (idle state)	0.4 W
Torque	5 Nm
Run time for 90°	120 s/90°
Setpoint value signal input	From the controller
IEC protection class	III (protective extra-low voltage)
Protection level	IP 54
EMC	EMC to 2014/30/EU
Weight	0.56 kg

Actuator NM24A-VST TR

Supply voltage	From the controller
Power consumption – when running	2 W
Power rating	4 VA
Self-consumption (idle state)	0.4 W
Torque	10 Nm
Run time for 90°	120 s/90°
Setpoint value signal input	From the controller
IEC protection class	III (protective extra-low voltage)
Protection level	IP 54
EMC	EMC to 2014/30/EU
Weight	0.78 kg

Actuator SM24A-VST TR

Supply voltage	From the controller
Power consumption – when running	2 W
Power rating	4 VA
Self-consumption (idle state)	0.4 W
Torque	20 Nm
Run time for 90°	120 s/90°
Setpoint value signal input	From the controller
IEC protection class	III (protective extra-low voltage)
Protection level	IP 54
EMC	EMC to 2014/30/EU
Weight	0.98 kg

Commissioning

On-site adjustment is not required
Due to the volume flow rates set in the factory, always ensure that the control units are only installed in the specified locations
After successful installation and wiring the controller is ready for use
Comply with the volume flow rate control ranges of the VAV terminal units, do not set a volume flow rate which is below the minimum flow rate
Only briefly remove the protective cap of the control component during wiring
For operation with the Modbus/BACnet/MP-Bus interface: additional commissioning steps such as user addressing and setting of the communication parameters are required
For operation with the MP-Bus interface in existing systems as a replacement for the VRP-M controller: activation of the VRP-M compatibility mode is required

Functional scope of service tools

Function/parameterisation	TROX FlowCheck app	PC-Tool	ZTH-EU
Setting qvmin, qvmax	R, W	R, W	R, W
Actual value signal 0 - 10 V DC, 2 - 10 V DC	R, W	R, W	–
Setpoint value setting analogue, Bus	R, W	R, W	–
Modbus, BACnet	R, W	R, W	–
MP bus	R, W	R, W	–
Set bus parameters	R, W	R, W	–
Carry out override controls	No	No	No
Trend display	Yes	Yes	–

R,W = Function can be read and written.

- = Function is not available for the service tool.

Communication interface Modbus RTU

Number	Register Address	Description	Range Enumeration	Unit	Scaling	Access
1		Setpoint value between q_vmin/Δp_min(reg. address 105) and q_vmax/Δp_max (reg. address 106) (1) (2) (3) (4)	0 – 10,000 Factory setting: 0	%	0.01	[R / W]
2	1	Override control Overwrites the setpoint value with override control	0: None 1: OPEN 2: CLOSED 3: q_vmin/Δp_min 5: q_vmax/Δp_max Factory setting: None	–	–	WR
3	2	Command triggering Triggering of functions for service and test purposes. Command ends automatically with 0	0: None 1: Adapting 3: Synchronisation Factory setting: None	–	–	WR
4	3	Type of actuator (*5)	0: Actuator not connected/not known 1: Actuator Air/Water with/without safety function 2: Volume flow controller VAV/EPIV 3: Fire damper 4: Energy Valve 5: 6way EPIV	–	–	RD
5	4	Current damper blade position acc. to mechanical limits (*5)	0 – 10,000	%	0.01	RD
6	5	Blade angle acc. to angle range (*5)	0 – 9,600	°	0.01	RD
7	6	Relative volume flow rate related to q_vnom(reg. address 110) (*6)	0 – 15,000	%	0.01	RD
8	7	Absolute volume flow rate (*6)	0 – q_vnom	m³/h	1	RD
9	8	Sensor value (voltage, resistance, switch) Value dependent on the setting of the sensor type (reg. address 107)	0 – 65,535	mV, Ω, 0/1	0.1	RD
10	9	–	–	–	-	[–]
11	10	Absolute volume flow rate in selected volume flow unit acc. to (reg. address 117) (Low word) < 16 of 32 bit (*6)	0 – 500,000,000	UnitSel	0.001	RD
12	11	Absolute volume flow rate in selected volume flow unit acc. to (reg. address 117) (High word) > 16 of 32 bit (*6)	0 – 500,000,000	UnitSel	0.001	RD
13	12	Analogue setpoint value Shows the setpoint value in % with analogue control input signal. Active if reg. address 118 = 0 (analogue)	0 – 10,000	%	0.01	RD
51	50	Relative differential pressure According to application case as per (reg. address 128)	0 – 20,000	%	0.01	RD
52	51	Absolute differential pressure	-1,000 – 15,000	[Pa]	0.1	RD
53	52	–	–	–	–	[–]
54	53	Absolute differential pressure in selected unit (reg. address 145) (Low word) < 16 of 32 bit	-10,000,000 – 100,000,000	UnitSel	0.001	RD
55	54	Absolute differential pressure in selected unit as per (reg. address 145) (High word) > 16 of 32 bit	-10,000,000 – 100,000,000	UnitSel	0.001	RD
100	99	Bus terminal resistor Indicates whether the terminal resistor (120 Ω) is active or deactivated. Can only be set using service tools.	0: Not active 1: Active Factory setting: Not active	–	–	RD
101	100	Serial number, part 1 Example: 00839-31324-064-008 1^stpart: 00839 2^stpart: 31324 3^stpart: 008	–	–	–	RD
102	101	Serial number, part 2	–	–	–	RD
103	102	Serial number, part 3	–	–	–	RD
104	103	Firmware version Example: 101, version 01.01.	–	–	–	RD
105	104	Malfunctions and service information – automatic reset if status has ceased	Bit 0: – Bit 1: Mechanical travel too high Bit2: Actuator cannot be moved (e.g. mechanical overload) Bit 3: – Bit 4: Error of dP sensor Bit 5: Return air flow detected Bit 6: Volume flow rate too low Bit 7: Flow rate in closed position Bit 8: Internal activity (e.g. test run, adaptation) Bit9: Gear release active Bit10: Bus monitoring triggered Bit 11: Actuator not suitable for application Bit 12: Pressure sensor incorrectly connected Bit 13: Pressure sensor not reached Bit 14: Error in dP sensor outside of measuring range	–	–	RD
106	105	Setting work areas q_vmin/Δp_min Requirements: q_vmin/Δp_min < q_vmax/Δp_max Vmax in the area 0 – 100 % of q_vnom/Δp_nominal	0 – q_vmax/Δp_max	%	0.01	WR
107	106	Setting work areas q_vmax/Δp_max Requirements: q_vmax/Δp_max < q_vmin/Δp_min Vmax in the area 20 – 100 % of q_vnom/Δp_nominal	2,000–10,000	%	0.01	WR
108	107	Type of sensor If reg. address 118 = 0 (analogue), then reg. address 107 = 1 (active) for mV	0: None 1: Active 2: Passive 3: – 4: Switch Factory setting: None	–	–	WR
109	108	Bus timeout monitoring If there is a bus timeout, the actuator moves into a position specified here. The position is mech. limited, q_vmin/Δp_min and q_vmax/Δp_max have no impact. Release if no change takes place in reg. address 1 or reg. address 2 in the specified time for reg. address 109. Display of release in reg. address 104. In hybrid mode, bus timeout activation is deactivated. Bus timeout time: acc. to reg. address 109	0 – 10,000 Factory setting: 0	%	0.01	WR
110	109	Time until release bus timeout monitoring If reg. 108 ≠ 0, then the initial automatic status is reg. 108 = 120 s.	0 – 3,600 0: Inactive Factory setting: Deactivated	s	1	WR
113	112	Nominal volume flow rate in selected volume flow unit acc. (reg. address 117) (Low word) < 16 of 32 bit	0 – 60,000,000	UnitSel	0.001	RD
114	113	Nominal volume flow rate in selected volume flow unit acc. (reg. address 117) (High word) > 16 of 32 bit	0 – 60,000,000	UnitSel	0.001	RD
115	114	–	–	–	–	[–]
116	115	–	–	–	–	[–]
117	116	Control mode	0: Position control (open loop) 1: Volume flow control Factory setting: Volume flow control	–	–	[R]
118	117	Unit selection – Unit selection for reg. address 11 and 12	0: – 1: m³/h 2: l/s 3: – 4: – 5: – 6: cfm	-	–	WR
119	118	Setpoint value setting If reg. address 118 = 0 (analogue), then reg. address 12 = active. If reg. address 118 = 1 (Bus), then reg. address 1 = active.	0: Analogue (0 – 10 V, 2 – 10 V) 1: Bus (Modbus, BACnet, MP-Bus) Factory setting: Analogue	–	–	WR
120	119	Pressure operating mode Only for VRU-M1R-M/B TR.	0: Negative pressure 1: Positive pressure	–	–	WR
121	120	–	–	–	–	[–]
122	121	–	–	–	–	[–]
123	122	–	–	–	–	[–]
124	123	Room pressure cascade release Only available if reg. address 124 = 0 (volume flow control) or 2 (room pressure control).	0: Inactive 1: Active 2: Active fast (only for VRU-M1R-M/B TR)	–	–	RD
125	124	Applications	0: Volume flow control 1: Pressure control 2: Room pressure control 3: Flow measurement	–	–	RD
126	125	Unit height	0 – 3,000 Factory setting: 0	m	1	WR
127	126	Nominal differential pressure in the selected unit as per (reg. address 145) More info in (reg. address 128)	D3: 0 – 50000 M1: 0 – 60000 M1R: 0 – 60000	UnitSel	–	RD
128	127	–	–	–	–	[–]
129	128	Nominal differential pressure in Pa If reg. address 124 = 0 (volume flow control), then reg. address 110 as q_vnom. If reg. address 124 = 1 (differential pressure control) or 2 (room pressure control), then the maximum is defined by the diff. pressure.	D3: 0 – 500 M1: 0 – 600 M1R: 0 – 750	Pa	0.1	RD
146	145	Selection of the pressure unit The selected unit is displayed in (reg. address 126).	0: Pascal 1: – 2: Water column Factory setting: Pascal	–	–	[–]

RD = Register can only be read
WR = Register can be read and written

(*1) If reg. address 118 = 1 (Bus), then reg. address 0 = active.

(*2) If reg. address 124 = 0 (volume flow control), then reg. address 0 = volume flow rate

(*3) If reg. address 124 = 0 (volume flow control) and reg. address 116 = 0 (position control), then reg. address = damper blade position

(*4) If reg. address 124 = 1 (differential pressure control) or 2 (room pressure control), then reg. address = pressure

(*5) If reg. address 124 = 2 (room pressure control) or 3 (volume flow rate measurement), then reg. address = deactivate 65535

(*6) If reg. address 124 = 1 (differential pressure control) or 2 (room pressure control), then reg. address = deactivate 65535

Protocol Implementation Conformance Statement – PICS (general information)

Date	2020-06-11
Vendor name	TROX GmbH
Vendor ID	329
Product name	VRU-D3-BAC, VRU-M1-BAC, VRU-M1R-BAC
Product model number	VRU – BAC
Application software version	01.02.0001
Firmware revision	10.02.0000
BACnet Protocol Revision	12
Product description	Controller for VAV/CAV and pressure applications
BACnet Standard Device Profile	BACnet Application Specific Controller (B-ASC)
BACnet Interoperability Building Blocks Supported	Data Sharing – ReadProperty-B (DS-RP-B) Data Sharing – ReadPropertyMultiple-B (DS-RPM-B) Data Sharing – WriteProperty-B (DS-WP-B) Data Sharing – WritePropertyMultiple-B (DS-WPM-B) Data Sharing – COV-B (DS-COV-B) Device Management – DynamicDeviceBinding-B (DM-DDB-B) Device Management – DynamicObjectBinding-B (DM-DOB-B) Device Management – DeviceCommunicationControl-B (DM-DCC-B)
Segmentation Capability	No
Data Link Layer Options	MS/TP master, baud rates: 9600, 19200, 38400, 76800, 115200
Device Address Binding	No static device binding supported
Networking Options	None
Character Sets Supported	ISO 10646 (UTF-8)
Gateway Options	None
Network Security Options	Non-secure device

Object processing

Object type	Optional properties	Writeable properties
Analogue input [AI]	Description COV Increment	COV Increment
Analogue Output [AO]	Description COV Increment	Present Value COV Increment Relinquish Default
Analogue Value [AV]	Description COV Increment	Present Value COV Increment
Binary Input [BI]	Description Active Text Inactive Text
Device	Description Location Active COV Subscriptions Max Master Max Info Frames Profile Name	Object Identifier Object Name Location Description APDU Timeout (1000 – 60000) Number Of APDU Retries (0 – 10) Max Master (1 – 127) Max Info Frames (1 – 255)
Multi-state Input [MI]	Description State Text
Multi-state Output [MO]	Description State Text	Present Value Relinquish Default
Multi-state Value [MV]	Description State Text	Present Value (if marked)

Processing of services

The device does not support the services "Create object" and "Delete object"
The specified maximum length of the writable character strings is based on single-byte characters

Object name 32 characters
Location 64 characters
Description 64 characters

The device supports the DeviceCommunicationControl Services, no password necessary
A maximum of 6 active COV subscriptions with a run time of 1 – 28800 s (maximum of 8 h) is supported

Communication interface BACnet MS/TP

Object Name	Object Type	Description	Values	COV Increment	Access
Device	Device [Inst.No]		0 – 4,194,302 Factory setting: 1	–	WR
RelPos	AI[1]	Damper blade position in % Status flags: (1), (2)	0 – 100	0.01 – 100 Factory setting: 1	RD
AbsPos	AI[2]	Absolute position in ° Angular position corresponding to the entire rotation range. Status flags: (1), (2)	0 – max. angle	0.01 – 90 Factory setting: 1	RD
SpAnalogue	AI[6]	Analogue setpoint value in % Shows the analogue setpoint value according to the selected application flow rate, pressure, damper blade position as per ApplicationSel MV[2]. If setpoint value setting in SpSource MV[122] = 1 (analogue), then SpAnalog AI[6] = active. The analogue setpoint value is limited by Min AV[97] and Max AV[98]. Status flags: (1), (3)	0 – 100	0.01 – 100 Factory setting: 1	RD
RelDeltaP	AI[9]	Relative differential pressure in % with respect to DeltaPnom_Pa AV[122]	0 – 150	0.01 – 150 Factory setting: 1	RD
RelFlow	AI[10]	Relative volume flow rate in % related to Vnom_m3h AV[112] Status flags: (*4)	0 – 150	0.01 – 150 Factory setting: 1	RD
AbsFlow_m3h	AI[12]	Absolute volume flow rate in m³/h Status flags: (*4)	0 – 60,000	1 – 60,000 Factory setting: 10	RD
DeltaP_UnitSel	AI[18]	Absolute differential pressure in selected unit as per UnitSelPressure MV[127]	-10,000 – 100,000	0.001 – 100,000 Factory setting: 1	RD
AbsFlow_UnitSel	AI[19]	Absolute volume flow rate in selected unit as per UnitSelAirFlow MV[121] Status flags: (*4)	0 – 500,000	0.01 – 500,000 Factory setting: 1	RD
Sens1Analogue	AI[20]	Sensor 1 as analogue value If Sensor1Type MV[220] = 2 (active), then display = analogue value in 0 – 10 V. If Sensor1Type MV[220] = 3 (passive), then display = resistance value. If RmPCascade MV[10] = 2 (enabled) or 3 (quickly enabled), then the sensor input is not available. Status flags: (*5)	0 – 65535	0.01 – 1000 Factory setting: 1	RD
DeltaP_Pa	AI[29]	Absolute differential pressure in Pa	0 – 600	0.01 – 600 Factory setting: 10	RD
SpRel	AO[1]	Relative setpoint value in % The rel. setpoint value depends on the application (flow rate/pressure/damper blade position). If SpSource MV[122] = 2 (bus), then SpRel AO[1] = active. The analogue setpoint value is limited by Min AV[97] and Max AV[98]. Status flags: (1), (2)	0 – 100 Factory setting: 0	0.01 – 100 Factory setting: 1	C
Min	AV[97]	Minimum setpoint value in % (q_vmin/P_min) Requirement: q_vmin/Δp_min < q_vmax/Δp_max q_vmin/Δp_min in the range 0 - 100 & q_vnom/Δp_nom	0 – q_vmax/Δp_max	0.01 – 100 Factory setting: 1	WR
Max	AV[98]	Maximum setpoint value in % (q_vmax/P_max) Requirement: q_vmax/Δp_max > q_vmin/Δp_min q_vmax/P_max in the range 20 - 100 % of q_vnom/P_nom	q_vmin/Δp – 100	0.01 – 100 Factory setting: 1	WR
Vnom_m3h	AV[112]	Nominal volume flow rate in m³/h	0 – 50,000	0.01 – 50,000 Factory setting: 1	RD
Vnom_UnitSel	AV[119]	Nominal volume flow rate in selected unit as per UnitSel MV[121]	0 – 250,000	0.01 – 1,000: Factory setting: 1	RD
SystemAltitude	AV[120]	System altitude in metres above sea level	0 – 3,000	1 – 3,000 Factory setting: 10	WR
DeltaPnom_Pa	AV[122]	Nominal differential pressure in Pa The nominal differential pressure depends on the selected pressure sensor (D3, M1, M1R). Depending on the selected application, the nominal differential pressure serves as dp@Vnom or as the maximum pressure limitation If ApplicationSel MV[2] = 1 (flow control), then display = nominal differential pressure If ApplicationSel MV[2] = 2 (pressure control) or 3 (room pressure control), then display = max. pressure limitation	D3: 0 – 500 M1: 0 – 600 M1R: 0 – 75	1 – 600 Factory setting: 1	RD
DeltaPnom_UnitSel	AV[129]	Nominal differential pressure in selected unit as per UnitSelPressure MV[127] More infos: see AV[122].		0.01 – 1000 Factory setting: 1	RD
BusWatchdog	AV[130]	Time until the release bus timeout monitoring in s If BusWatchdog AV[130] ≠ 0, then monitoring of SpRel AO[1] and override MO[1] for change. If changes in SpRel AO[1] and override MO[1], then reset the bus timeout monitoring. If SpSource MV[122] = 1 (analogue), then BusWatchdog AV[130] only takes account of override MO[1].	0 – 3600 s Factory setting: 0 (bus timeout monitoring deactivated)	0.01 – 1000 Factory setting: 1	WR
Sens1Switch	BI[20]	Switch status of the switch at the sensor input If SenType MV[220] = 5 (switch), then Sens1Switch BI[20] = active. Status flags: (*6)	0: Inactive 1: Active	–	RD
BusTermination	BI[99]	Terminal resistor Shows whether the terminal resistor (120 Ω) has been activated via the service tools.	0: Deactivated 1: Activated	–	RD
SummaryStatus	BI[101]	Condensed status Groups together the status of the objects: "StatusSensor" MI[103] "StatusFlow" MI[104] "StatusActuator" MI[106] "StatusPressure" MI[109] "StatusDevice" MI[110]	Not equal to 1: OK 1: Not OK	–	RD
RmPCasacade	MV [10]	Room pressure cascade If RmPCascade MV[10] = 2 (active) or 3 (active fast), then sensor1 is the input for the room cascade (0 – 10 V). If ApplicationSel MV[2] =1 (volume flow control) or 3 (room pressure control), then RmPCascade MV [10] = active. Status flags: (*7)	1: Inactive 2: Active 3: Active fast (for M1R only)	–	RD
InternalActivity	MI[100]	Internal status	1: None 2: – 3: Adaption 4: Synchronisation	–	RD
StatusSensor	MI[103]	Status of the differential pressure sensor If status end = automatic reset	1: OK 2: dP sensor not OK 3: dP sensor outside of measuring range 4: dP sensor incorrectly connected	–	RD
StatusFlow	MI[104]	Volume flow rate status If there is no volume flow rate within 600 s, then StatusFlow MI[104] = 3.	1: OK 2: – 3: No airflow detected	–	RD
StatusActuator	MI[106]	Status of the actuator Status flags: (*2)	1: OK 2: Actuator cannot be moved 3: Gear release active 4: Mechanical travel exceeded 5: Actuator not suitable for application	–	RD
StatusPressure	MI[109]	Differential pressure status If the differential pressure is not reached within 180 s, then StatusPressure MI[109] = 3.	1: OK 2: – 3: Pressure not reached	–	RD
StatusDevice	MI[110]	Status of the device during bus monitoring According to BusWatchdog AV[130].	1: OK 2: Bus timeout monitoring activated	–	RD
Override	MO[1]	Override control Overwrites the setpoint value with a forced command. Status flags: (*8)	1: None 2: OPEN 3: CLOSED 4: q_vmin/Δpmin 5: – 6: q_vmax/Δpmax Factory setting: None (1)	–	C
ApplicationSel	MV[2]	Display of application VRU-D3-M/B TR, VRU-M1-M/B TR - Flow control - Pressure control - Flow measurement VRU-M1R-M/B TR - Room pressure control	1: Flow control 2: Pressure control 3: Room pressure control 4: Flow measurement	–	RD
ControlMode	MV[100]	Control mode Status flags: (*9)	1: PosCtrl 2: FlowCtrl Factory setting: FlowCtrl	–	RD
OperationMode	MV[102]	Operating mode Only relevant for VRU-M1R-BAC. Status flags: (*10)	1: Negative pressure 2: Positive pressure	–	WR
Command	MV[120]	Release test functions Status flags: (*2)	1: None 2: Adaption 3: – 4: Reset Factory setting: None	–	WR
UnitSelAirFlow	MV[121]	Selection of the volume flow unit The selected unit is indicated in AI[19] and AV[104]	1: – 2: m³/h 3: l/s 4: – 5: – 6: – 7: cfm	–	WR
SpSource	MV[122]	Selection of the setpoint value setting If SpSource MV[122] = 1 (analogue), then SpAnalog AI[6] = active. If SpSource MV[122] = 2 (bus), then SpRel AO [1] = active.	1: Analogue (0 – 10 V, 2 – 10 V) 2: Bus (Modbus, BACnet, MP-Bus) Factory setting: Analogue	–	WR
UnitSelPressure	MV[127]	Selection of the pressure unit The selected unit is indicated in DeltaP_UnitSel AI[18] and DeltaPnom_UnitSel AV[129].	1: Pascal 3: Water column Factory setting: pascal	–	WR
UnitSelTemp	MV[128]	Selection of temperature unit The selected unit is located in AI[20].	1: K 2: °C 3: °F Factory setting: °C (2)	–	W
Sens1Type	MV[220]	Definition of the sensor type If Sens1Type MV[220] = 2 (active) or 3 (passive), then Sens1Analog AI[20] active. If Sens1Type MV [220] = 5 (switch), then Sens1Schalter BI[20] active.	1: None 2: Active sensor (in hybrid mode) 3: Passive sensor 4: – 5: Switch Factory setting: None	–	WR

RD = Register can only be read
WR = Register can be read and written
C = Commendable with priority array

Status flags:

(*1) If the gear latch is pressed, then Overridden = 1

(*2) If ApplicationSel MV[2] = 3 (room pressure control) or 4 (flow measurement), then Out of Service = 1

(*3) If SpSource MV[122] = 2 (Bus), then Out of Service = 1

(*4) If ApplicationSel MV[2] = 2 (pressure control) or 3 (room pressure control), then Out of Service = 1

(*5) If Sens1Type MV[220] = 1 (none), then Out of Service = 1

(*6) If Sens1Type MV[220] ≠ 5, then Out of Service = 1

(*7) If ApplicationSel MV[2] = 2 (pressure control) or 4 (flow measurement), then Out of Service = 1

(*8) If ApplicationSel MV[2] = 4 (flow measurement), then Out of Service = 1

(*9) If ApplicationSel MV[2] ≠ 1 (volume flow control), then Out of Service = 1

(*10) If ApplicationSel MV[2] ≠ 3 (room pressure control), then Out of Service = 1

This specification text describes the general properties of the product.

Category

Universal controller for volume flow rate

Application

Control of a constant or variable volume flow rate setpoint
Electronic controller for connecting a controlled variable and tapping an actual value signal
The actual value signal relates to the nominal volume flow rate such that commissioning and subsequent adjustment are simplified
Stand-alone operation or integration in central building management system

Area of application

Differential pressure transducer with dynamic measuring principle for clean air in ventilation and air conditioning systems

Actuator

Actuator slow-running; Running time 120s for 90°

Installation orientation

Either direction

Connection

Pluggable connection terminals; no additional terminal box required

Supply voltage

24 V AC/DC

Interface/signalling

Analogue signal

0 – 10 V DC or 2 – 10 V DC

Bus interface

MP bus
Modbus RTU
BACnet MS/TP

Interface information

Analogue

Volume flow rate setpoint and actual value

Bus interface

Volume flow rate setpoint and actual value
Damper blade position
Fault status

System connections

MP-Bus for optional extensions
Suitable for TROX X-AIRCONTROL zone module X-AIRZMO- MP
Gateways for LonWorks, Modbus, BACnet, KNX e.g. Belimo UK24EIB
Fan optimiser, e.g. Belimo COU24-A-MP

Modbus RTU for optional extensions

Suitable for TROX X-AIRCONTROL zone module X-AIRZMO- MOD, e.g. in conjunction with X-SENS-SPLITTER

Special functions

Activation qvmin, qvmax, Closed, Open, Control Stop by means of external switching contacts/wiring or bus communication

Parameter setting

Parameters specific to VAV terminal unit set at the factory

Operating values qvmin, qvmax factory set
Signal characteristic factory set

Subsequent adjustment

Via TROX FlowCheck app (NFC or Bluetooth with optional adapter)
Via PC software

Factory condition

Electronic controller factory-mounted on the terminal unit
Factory parameter settings
Functional test under air; certified with sticker
Controller in OPEN position

TVR

–

200

BUDN

V 0

qvmin – qvmax

m³/h

| |

8 9

1 Type

TVR VAV terminal unit

2 Acoustic cladding

No entry: none

D with acoustic cladding

3 Material

Galvanised sheet steel (Standard construction)

P1 Powder-coated RAL 7001, silver grey

A2 Stainless steel construction

4 Duct connection

5 Nominal size [mm]
100, 125, 160, 200, 250, 315, 400

6 Accessories
No entry: none
D2 Double lip seal both sides

G2 Matching flanges for both ends

7 Attachments (control component)

BUDN Universal controller with dynamic transducer

8 Operating mode

F Constant value (a setpoint value)

V variable (setpoint value range)

9 Signal voltage range

0 0 – 10 V DC

2 2 – 10 V DC

10 Operating values for factory setting

Volume flow rates in m³/h or l/s

qvconst (only with operating mode F)

qvmin (only with operating mode V)

qvmax (only with operating mode V)

11 Volume flow unit
m³/h

l/s

Order example: TVR/100/D2/BUDN/V0/50-354 m³/h

Acoustic caldding	None
Material	galvanised sheet steel
Nominal size	100 mm
Accessories	Double lip seal both sides
Attachment	VARYCONTROL Universal controller, dynamic transducer
Signal voltage ranger	0 – 10 V DC
Operating value	qvmin= 50 m³/h qvmax= 354 m³/h

Variants, Product details

Universal controller, type VRU-D3-M/B TR

① Adaptation key

② Actuator connection socket

③ NFC interface

④ Dummy cover (not in use)

⑤ Cable glands (separate supply and control)

⑥ Fixing holes

⑦ Connection for effective pressure sensor

Characteristic of the setpoint value signal 

① Signal voltage range 0 – 10 V

② Signal voltage range 2 – 10 V

Analogue interface 0 – 10 V DC or 2 – 10 V DC

In the delivery state, the setpoint must be specified via the analogue interface. If the setpoint value is specified via a digital communication interface, this can be changed to Modbus, BACnet or MP-Bus at any time via the TROX FlowCheck App. The analogue interface can be set for the signal voltage range 0 - 10 V DC or 2 - 10 V DC through the TROX FlowCheck App. The assignment of the volume flow setpoint or actual value to the voltage signal is shown in the characteristic diagrams.

Setpoint value setting

Variable operation

In the variable operating mode, the setpoint is specified with an analogue signal at terminal 3. Setpoint specifications via the respective bus system are rejected
The selected signal voltage range 0 – 10 V or 2 – 10 V DC is assigned to the volume flow rate range qvmin – qvmax assigned to
Volume flow rate range qvmin – qvmax set at the factory according to the order code details
Subsequent adjustment of qvmin or qvmax possible via adjustment device, TROX FlowCheck app or PC tool

Constant value mode

In the operating mode fixed value operation, no analogue signal is required at terminal 3
The value given by qvmin is controlled through the fixed volume flow rate value
Volume flow qvmin set at the factory according to the order code details
Subsequent adjustment of qvmin possible via adjustment device, TROX FlowCheck app or PC tool

Actual value as feedback for monitoring or tracking control

The actual volume flow rate measured by the controller can be captured as a voltage signal at terminal 5
Selected signal voltage range 0 - 10 V DC or 2 - 10 V DC is applied to the volume flow range 0 - qvnom shown
In analogue mode, there is the parallel option of querying operating data via the Modbus interface (hybrid mode)

Override control

For special operating situations, the volume flow controller can be set to a special operating state (override control). The following modes are possible: control qvmin, control qvmax, damper blade open (OPEN), damper blade closed (CLOSED) or control stop.

Override controls via signal input Y or override control inputs z1, z2

Through suitable wiring of the inputs Y, z1, z2, the override controls can be activated according to the wiring diagrams via wiring with external switching contacts/relays (see wiring examples).

Override control CLOSED via command signal at signal input Y

With signal voltage range 0 - 10 V DC and setting value qvmin = 0

Flap CLOSED: Y < 0.45 V DC
Modulating duty: Y > 0.55 V DC

With signal voltage range 0 - 10 V DC and qvmin > 0

If override control CLOSED is not possible via the command signal. The control process takes place over the entire signal voltage range

With signal voltage range 2 - 10 V DC and setting value qvmin = 0

Flap CLOSED: Y < 2.36 V DC
Modulating duty: Y > 2.44 V DC

With signal voltage range 2 - 10 V DC and setting value qvmin > 0

Flap CLOSED: Y < 0.3 V DC
Regulation qvmin: Y > 0.3 V DC
Modulating duty: Y > 2.44 V DC

Digital communication interface

For a setpoint value specification via the bus interface, an on-site conversion with the TROX FlowCheck App is necessary. The bus interface can be set to Modbus, BACnet and MP-Bus. For smooth data exchange in the on-site bus network, it is necessary to set the communication parameters and the participant address for the bus interface. The communication parameters of the bus systems (address, baud rate, etc.) can be set using the TROX FlowCheck app. The interface provides standardised bus register/object access to the available data points.

Setpoint value setting

In Modbus RTU operating mode (factory setting), the setpoint is specified by entering the volume flow setpoint [%] in Modbus register 0
In the BACnet MS/TP operating mode, the setpoint is specified by specifying the volume flow setpoint [%] in the BACnet object AI[1]
The percentage value refers to the volume flow rate range specified by qvmin – qvmax defined volume flow range
Volume flow rate range qvmin – qvmax set at the factory according to the order code details
Subsequent adjustment of qvmin or qvmax possible via setting device, TROX FlowCheck App, PC tool or via Modbus/BACnet interface

Actual value as feedback for monitoring or tracking control

Both Modbus and BACnet show actual values in m³/h (factory setting). Other units such as l/s and cfm can also be selected.
In addition to the volume flow rate actual value, other information can be read out using other Modbus registers/BACnet objects
Overview of the registers/objects in the communication tables
In bus mode the actual volume flow rate can be captured at terminal 5
The volume flow rate range 0 – qvnom always corresponds to the signal voltage range (0)2 – 10 V DC

Override control

For special operating situations, the volume flow controller can be set to a special operating state (override control). The following
modes are possible: control qvmin, control qvmaxthe control damper is in the open position (OPEN), control damper closed (CLOSED) or control stop.

Priority control via the bus

Specifications are made via Modbus register 1 or via BACnet object type MO[1].

Override control by bus failure monitoring (Modbus)

In case of failure of the Modbus communication for a defined period of time, a predefined operating state qvmin, qvmax, OPEN or CLOSED can be activated.

The override to be activated in case of bus failure is defined via Modbus register 108 or 109
The determination after which bus failure time the override control is activated is made via Modbus register 109 or 110
Any Modbus communication resets the bus failure monitoring timeout

Override control by bus failure monitoring (BACnet)

If BACnet communication fails for a specified period of time, a predefined operating state can be activated.

The setpoint to be activated in the event of bus failure is determined via the Reliquish_Default of SpRel (Object AO1)
Bus failure time is defined via BusWatchdog (object type AV [130])
Communication on the data points SpRel (Object AO[1] and Override (Object MO[1]) resets the timeout of bus failure monitoring

Override controls for diagnosis

Activation via bus systems, external/on-site switching contacts (bridges), and TROX FlowCheck App.

Prioritisation of different default options

Specifications for override controls via switching contacts are prioritised over Modbus/BACnet specifications.

Highest priority: Preset via override control by external wiring (switching contact, relay)
Medium priority: Specifications via the service plug (TROX FlowCheck App) for test purposes
Lowest priority: Default via Modbus/BACnet/MP bus

Downloads

product information

Product data sheet BUDN

BUDN_PD_2024_01_16_DE_en Product data sheet 770 KB pdf

certificates

Konformitätserklärung / Declaration of conformity BUDN - VRU-D3-M/B.1 TR

BUDN-VRU-D3-M_B.1-TR_CE_01_2020_07_30_de_en_fr Certificate 190 KB pdf
Konformitätserklärung / Declaration of conformity BUDN - LM24A-VST.1 TR

LM24A-VST.1-TR_CE_01_2020_07_30_de_en_fr Certificate 190 KB pdf
Konformitätserklärung / Declaration of conformity BUDN - NM24A-VST.1 TR

NM24A-VST.1-TR_CE_01_2020_07_30_de_en_fr Certificate 190 KB pdf
Konformitätserklärung / Declaration of conformity BUDN - SM24A-VST.1 TR

SM24A-VST.1-TR_CE_01_2020_07_30_de_en_fr Certificate 190 KB pdf

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BUDN

CONTROL COMPONENT WITH DYNAMIC TRANSDUCER AND SEPARATE ACTUATOR FOR VAV TERMINAL UNITS

General information

Technical information

Function, Technical data, Specification text, Order code

Variants, Product details

Downloads

product information

Product data sheet BUDN

certificates

Konformitätserklärung / Declaration of conformity BUDN - VRU-D3-M/B.1 TR

Konformitätserklärung / Declaration of conformity BUDN - LM24A-VST.1 TR

Konformitätserklärung / Declaration of conformity BUDN - NM24A-VST.1 TR

Konformitätserklärung / Declaration of conformity BUDN - SM24A-VST.1 TR

TECHNICALLY NECESSARY

STATISTICS AND WEBSITE ANALYSIS

CONVENIENCE AND PERSONALISATION

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