BUPN

Duct pressure control - static transducer

MP-bus marketing highlights image

BACnet marketing highlights image

Modbus marketing highlights image

Control component with static transducer and separate actuator for VAV terminal units for duct pressure control

Universal device for use with VAV terminal units

Controller and static differential pressure transducer in one casing
Separate actuator with simple plug connection
Use in ventilation and air conditioning systems, with clean and contaminated air
Duct pressure control up to 450 Pa, e.g. duct pressure control
Constant value control Δ_pmin or variable control Δ_pmin – Δ_pmax
Operating parameters Δ_pmin and Δ_pmax are set in the factory and saved in the controller
Activation of override controls via external wiring
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 Modbus RTU, BACnet MS/TP or MP bus

General information

Application

All-in-one control engineering device for VAV terminal units for duct pressure control up to 450 Pa in ventilation and air conditioning systems
Static differential pressure transducer and controller electronics combined in one casing
Separate actuator with prefabricated connection plug
For use with clean and contaminated air
Variable duct pressure control by presetting setpoint values via communication interfaces or analogue signal e.g. from the central building management system
Duct pressure control with constant value through a set operating value
Override controls for activating Δ_pmax, Δ_pmin, shut-off, control stop, OPEN position via Modbus/BACnet register or partly with switch or relay possible
Duct pressure actual value is available as 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

Control strategy

Duct pressure fluctuations are compensated, e.g. due to changing volume flow rate requirements
To prevent the control from becoming unstable, a dead band is allowed within which the damper blade does not move.
Δ_pmin: selected operating value of minimum duct pressure or constant value
Δ_pmax: selected operating value of maximum duct pressure
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 pressure setpoint value
Analogue signal for actual pressure value

Digital communication interface (Bus)

Modbus RTU, RS485
BACnet MS/TP, RS485
MP bus
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-Bus
Work area corresponds to Δ_pmin – Δ_pmax

Constant value mode (F)

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

Operating parameters

Nominal pressure Δ_pNom= 500 Pa
Volume flow rate range in the controller set in the factory
Δ_pmin: minimum pressure, 0 – 100 % of Δ_pNom adjustable
Δ_pmax: maximum pressure, 20 – 100 % of Δ_pNomadjustable
Reference point for the output signal: Δ_pNom
Δ_pmin and Δ_pmax at factory up to 90 % from Δ_pNom adjustable, so that adjustment behaviour is fully visible in the output signal
Note the adjustable duct pressure range from 25 - 450 Pa

Signal voltage ranges

0 – 10 V DC
2 – 10 V DC

Parts and characteristics

Transducer for static 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
Duct pressure tapping set with duct pressure tapping nipple and measuring hose included in delivery
Controller casing can be opened without tools

Construction

BUPN with actuator LM24A-VST for:

TVR, TZ-Silenzio, TA-Silenzio, TVZ, TVA
TVRK up to nominal size 250

BUPN with actuator NM24A-VST for:

TVJ
TVT up to dimensions 1000 × 300 or 800 × 400
TVRK nominal size 315 – 400

BUPN with actuator SM24A-VST for:

TVT from dimensions of 800 × 500 to 1000 × 600

Commissioning

Due to the factory set duct pressure operating values, it must always be ensured that the control units are only installed at the points provided
Modbus/BACnet/MP bus interface: additional commissioning steps required
Operating parameters can be adjusted using the TROX FlowCheck app

Useful additions

Smartphone app for Android and iOS
Adjustment device type ZTH-EU (order code AT-VAV-B)
Belimo PC-Tool
NFC Bluetooth converter ZIP-BT-NF

Technical information

Function, Specification text, Order code

Principle of operation Universal controller for duct pressure control: TVR, TVJ, TVT, TZ-/TA-Silenzio, TVZ, TVA, TVRK

① Differential pressure transducer
② Actuator
③ Differential pressure controller
④ Setpoint value signal or programmed fixed constant value
⑤ Duct pressure tapping point
⑥ Differential pressure sensor of the VAV terminal unit (unused, depending on types and variant possibly not accessible or not available)
⑦ Differential pressure connection at the transducer of the control component, depending on the installation situation (supply air/exhaust air):

One connection side for duct pressure measurement - see ⑤
Other connection side open as reference value

Application area duct pressure controller (string pressure controller)

The ventilation planning of a larger building often requires an extensive duct network in which individual areas of the building are supplied via side ducts of the main duct. Sufficient air supply to the various side ducts must be ensured in all (use-dependent) operating situations, so that the planned ventilation of the respective zones or rooms is guaranteed by the volume flow controllers used.

In the easiest implementation, (high) volume flow rates are reduced here exclusively by terminal volume flow controllers in the zones or rooms. In this way, high pressure differences can be reduced close to the room - but this leads to acoustic and control engineering disadvantages.

A sensible alternative is to regulate the air demand of the side duct with an additional control unit according to demand and thus to run in the duct only as much differential pressure as is really necessary to supply the volume flow controllers in this duct. This means that only small pressure differences need to be adjusted at the terminal volume flow controllers, which benefits the accuracy and acoustic performance.

The use of volume flow controllers is not possible for this purpose. In the case of series-connected volume flow controllers in a line and zone or in a room, only one controller takes over volume flow control at a time (limiting variable) - all others are in the OPEN position. In this way only a volume flow limitation is realised.

Duct pressure controllers should always be used where parallel ducts have different static pressure requirements. To ensure that sufficient pressure is always available as required and to avoid unnecessary throttling, the static pressure in the individual air duct sections / ducts should be regulated. The duct pressure controller is set so that it regulates the duct pressure only to the same level that the volume flow controllers can operate and the outlet resistances in the zones behind them are overcome. Overall, the use of a duct pressure controller in the line and the use of a terminal volume flow controller for zone or room leads to a more stable system performance that is improved acoustically and energetically.

Functionality of a duct pressure controller

A static differential pressure transducer converts the duct pressure into an electrical voltage signal. The differential pressure actual value is available as a voltage signal. The factory setting is such that 10 V DC always corresponds to the nominal differential pressure (Δ_pNom). The differential pressure setpoint value is either a constant value or it comes from a setpoint adjuster or from switch contacts. The controller compares the differential pressure setpoint value to the actual value and controls the actuator accordingly. Differential pressure parameters and signal voltage range are stored in the control component. Changes made by the customer can easily be made with the TROX FlowCheck App, adjustment device or a notebook.

Category

Universal controller for duct pressure

Application

Control of a constant or variable duct pressure setpoint.
Electronic controller for applying a reference variable and tapping an actual value signal.
The actual value signal relates to the nominal pressure such that commissioning and subsequent adjustment are simplified.
Stand-alone operation or integration in central building management system.

Area of application

Duct pressure control for ventilation and air conditioning systems in the range of 25-450 Pa (Static transducer integrated)

Actuator

Actuator slow-running; Running time 120 s 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:

Modbus RTU
BACnet MS/TP
MP bus

Interface information

Analogue signal:

Duct pressure, setpoint and actual value

Bus interface:

Duct pressure, setpoint and actual value
Damper blade position
Fault status

System connections

MP-Bus for optional extensions

Gateways for LonWorks, Modbus, BACnet, KNX e.g. Belimo UK24xxx
Fan optimiser e.g. Belimo COU24-A-MP

Special functions

Activation Δ_pmin, Δ_pmax, Closed, Open, Control Stop by means of external switch contacts/wiring or bus communication

Parameter setting

Parameters specific to VAV terminal unit set at the factory

Nominal pressure factory set
Operating values Δ_pmin, Δ_pmax factory set
Signal characteristic factory set

Subsequent adjustment possible with

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

Factory condition

Electronic controller factory set on control unit
Factory setting, certified with sticker
Controller in OPEN position
Duct pressure tapping set with duct pressure tapping nipple and measuring hose included in delivery

TVR

–

200

BUPN

PDS

Pmin

–

Pmax

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)
BUPN Universal controller for duct pressure (VARYCONTROL)

8 Equipment function/Installation location
PDE Duct pressure control, extract air
PDS Duct pressure control, supply air

9 Operating mode
F Constant value (a setpoint value)
V variable (setpoint value range)

10 Signal voltage range
0 0 – 10 V DC
2 2 – 10 V DC

11 Operating values for factory setting
Duct pressure in [Pa]
Δ_pconst (only with operating mode F)
Δ_pmin (only with operating mode V)
Δ_pmax (only with operating mode V)

Order example: TVR/100/D2/BUPN/PDS/V0/50-350 Pa

Acoustic cladding	None
Material	galvanised sheet steel
Nominal size	100 mm
Accessories	Double lip seal both sides
Attachment	VARYCONTROL Universal controller duct pressure, static transducer
Equipment function/installation location	Duct pressure control, supply air
Operating mode	variable operation – signal voltage range 0 – 10 V DC
Operating values	Δ_pmin= 50 PaΔ_pmax= 350 Pa

Variants, Product details

Universal controller, Type VRU-M1-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 Differential pressure connection

Characteristic of the setpoint value signal

① Signal voltage range 0 – 10 V DC

② Signal voltage range 2 – 10 V DC

Digital communication interface

An on-site changeover using the smartphone app is necessary for a setpoint specification via the bus interface. The bus interface can be set to Modbus, BACnet or MP-Bus. For smooth data exchange in the on-site bus network, the communication parameters and user address must be set for the bus interface. The communication parameters for the bus systems (address, baud rate etc.) can be set using the smartphone app. The interface provides standardised bus register/object access to the available data points.

Setpoint value setting

In the operating mode Modbus RTU (factory setting), the setpoint value is only set by specifying the volume flow rate set point value [%] in the Modbus register 0.
The transferred percentage value refers to the volume flow rate range specified by _qvmin – _qvmax fixed volume flow rate range.
Volume flow rate range _qvmin – _qvmax pre-set in the factory according to the order code entries.
Subsequent adjustment of _qvmin or _qvmax possible using service tool smartphone app or Modbus/BACnet interface.

Actual value as feedback for monitoring or tracking control

The actual values can be read off in m³/h (factory setting) in both Modbus and BACnet. Other units such as m³/s, l/s, l/min, l/h, gpm, cfm possible.
In addition to the actual value of the volume flow rate, further information on the other Modbus registers/BACnet objects can be read out as well. Overview of registers/objects in the communication tables.
For diagnostic purposes, the volume flow rate actual value can be tapped at terminal 5 in bus mode.
The volume flow rate range 0 – _qvNom here always corresponds to the signal voltage range of (0)2 – 10 V DC.

Override control

For special operating situations, the volume flow controller can be put in a special operating mode (override control). The following are possible: control _qvmin, control _qvmax, damper blade in the OPEN position or damper blade CLOSED.

Override control via the bus

This is set via the Modbus register 1 or via BACnet object type MO[1].

Override control via bus timeout monitoring (Modbus)

If the Modbus communication fails for a stipulated time period, a pre-defined operating mode _qvmin, _qvmax, OPEN or CLOSED can be activated.

The override control to be activated upon bus timeout is specified via Modbus register 108 or 109
The time period after which override control is activated upon bus timeout is specified via Modbus register 109 or 110
Each Modbus communication resets the timeout of the bus timeout monitoring

Override control via bus timeout monitoring (Modbus)

If the BACnet communication drops out for a specified time period, a predefined operating mode can be activated.

The setpoint value to be activated upon bus timeout is specified via Relinquish_Default from SpRel (object AO1)
Bus timeout period is defined via BusWatchdog (object type AV [130])
Communication on the datapoints SpRel (Object AO[1] and Override (Object MO[1])

Override controls for diagnostic purposes

Activation via bus system, external switch contacts / switch contacts provided by others (jumpers), and smartphone app.

Prioritisation of various setting options

Settings for override controls via analogue are prioritised over Modbus/BACnet settings.

Highest priority: setting via an analogue override control
Medium priority: settings via the service connector (smartphone app) for test purposes
Lowest priority: setting via Modbus/BACnet/MP-Bus

Product details, Technical data

<strong>View of plug-in terminal strips at the VRU</strong>

Nomenclature

1, 6, 9, 13: ⊥, – = Ground, neutral
2, 10, 14: ~, + = Supply voltage 24 V
3: Y = Setpoint signal Y and override controls
5: U/MP = Actual value signal or MP-Bus or service tool connection
7: D+ = B = C2 = RS-485 bus (BACnet MS/TP or Modbus RTU)
8: D- = A = C1 = RS-485 bus (BACnet MS/TP or Modbus RTU)
11, 12: z1, z2 = Forced control inputs
15: Extension for external sensor
16: Not used

Universal controller, type VRU-M1-M/B TR

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Differenzdrucksollwert_2-10Vfo_01pdf.pdf.link

Differenzdruckistwert_2-10V_fo_01pdf.pdf.link

Universal controller for VAV terminal units

–	Controller		Actuator		–
Order code detail	Part number	Type	Part number	Type	VAV terminal units
BUPN	A00000073652	VRU-M1-M/B TR	A00000076423	LM24A-VST TR	①
BUPN	A00000073652	VRU-M1-M/B TR	A00000073640	NM24A-VST TR	②
BUPN	A00000073652	VRU-M1-M/B TR	A00000073642	SM24A-VST TR	③

①

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

TVRK nominal size 125 – 250

②

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

TVRK nominal size 315 – 400

③
TVT dimensions from 800 × 500 to 1000 × 600

Universal controller Type VRU-M1-M/B TR

Measurement principle	static transducer type, independent of position
Nominal pressure	500 Pa
Pressure control range	25 – 450 Pa
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 plus connected VST drive
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: by Smartphone app
Setpoint value signal input (analogue optional)	0 – 10 V, 2 – 10 V Input resistance 100 kΩ
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 adjusting is not required
Due to the operating values set at the factory, it must always be ensured that the control units are only installed at the intended locations
Install control unit in the duct range to be controlled
Set up pressure tap for duct pressure

For supply air:

Connect the positive connection of the controller to the duct to be regulated
Leave the negative connection of the controller open

For extract air:

Leave the positive connection of the controller open
Connect the negative connection of the controller to the duct to be regulated

The duct must always be connection on the side remote from the fan
- Note the duct pressure control range stipulated in the technical data
- Establish electrical wiring connection
- The controller is then ready for use
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	Smartphone app	PC-Tool	ZTH-EU
Adjustment Δ_pmin, Δ_pmax	R, W	R, W	R, W
Mode, control signals 0 – 10 V, 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	–

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

Downloads

product information

Product data sheet BUPN

BUPN_PD_2024_01_16_DE_en Product data sheet 730 KB pdf

certificates

Konformitätserklärung / Declaration of conformity BUPN-VRU-M1-M_B.1-TR

BUPN-VRU-M1-M_B.1-TR_CE_01_2020_07_30_de_en_fr Certificate 190 KB pdf
Konformitätserklärung / Declaration of conformity LM24A-VST.1-TR

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

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

SM24A-VST.1-TR_CE_01_2020_07_30_de_en_fr Certificate 190 KB pdf

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BUPN

Control component with static transducer and separate actuator for VAV terminal units for duct pressure control

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