BUSNF - Volume flow spring return MP/Modbus/BACnet | TROX GmbH
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X-AIRCONTROL zone module MP-bus

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BUSNF  

Control component with static transducer and separate spring return actuator for VAV terminal units

Universal device for use with VAV terminal units

  • Controller and static differential pressure transducer in one casing
  • Separate actuator with spring return for safety positions
  • Use in ventilation and air conditioning systems, with clean and contaminated 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

 

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General information

Application

  • All-in-one control engineering device for VAV terminal units
  • Static differential pressure transducer and control electronics in one casing
  • Separate actuator with spring return
  • Safe position can be defined upon failure of the supply voltage or wire breakage in the order code: NC = damper closed, NO = damper in OPEN position
  • For use with clean and contaminated air
  • 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

 




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-Bus
    Work 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 qvnomadjustable
  • 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 static measurement principle
  • Separate actuator with simple connection plug
  • Plug-in terminal for supply line and controls including cover
  • Socket for the actuator
  • NFC and service interface
  • Crank handle for manual winding of the spring return actuator
  • 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

BUSNF with actuator NF24A-VST for:



  • TVR, TZ-Silenzio, TA-Silenzio, TVZ, TVA, TVRK, TVJ
  • TVT up to dimensions 1000 × 300 or 800 × 400
  • TVRK



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, Specification text, Order code

  • Function
  • 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 recorded 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 control, e.g. by a complete shut-off 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. If the supply voltage is interrupted or there is a wire breakage, the spring return actuator moves to the OPEN (NO) or CLOSED (NC) position that was set at the factory via the order code.



Category

  • Universal controller for volume flow rate with safe position




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 static measurement principle for clean air in ventilation and air conditioning systems




Actuator

  • Spring return actuator for defined safe position of the damper blade in case of power failure. Run time 120s for 90°; run time spring return <20s 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 values


Bus interface:



  • Volume flow rate setpoint and actual values
  • Damper blade position
  • ​​​​​​​Fault status




System connections

MP-Bus for optional extensions



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




Special functions

  • Activation qvmin, qvmax, 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
  • 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



Anbaugruppe BUSNF (beispielhaft in Kombination mit dem TVR dargestellt)
TVRDP1/200/D2/BUSNF/V0/500 – 1200 [m³/h] /NO
|||||||||||
12345679101112

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)
BUSNF Universal controller with static transducer and separate spring return actuator 

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 

12 Damper blade position
Spring return only
NO power off to OPEN
NC power off to CLOSE  


Order example: TVR/100/D2/BUSNF/V0/50-354 m³/h
Acoustic claddingNone
Materialgalvanised sheet steel
Nominal size100 mm
AccessoriesDouble lip seal both sides
AttachmentVARYCONTROL Universal controller, static transducer and separate spring return actuator
Signal voltage range0 – 10 V DC
Operating valuesqvmin= 50 m³/h
qvmax = 354 m³/h
Damper blade position NC Power off to CLOSE


Variants, Product details

  • VARIANTS
  • PRODUCT DETAILS



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 and 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 volume flow rate actual value, further information on other Modbus registers/BACnet objects can be read out. 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

  • PRODUCT DETAILS
  • TECHNICAL DATA

Universal controller for VAV terminal units

Controller

Actuator

Order code detail

Part numberTypePart numberType

VAV terminal units

  • TVR, TZ-Silenzio, TA-Silenzio, TVZ, TVA, TVRK
  • TVJ, TVT up to dimensions of 1000 × 300 or 800 × 400
  • TVRK

 

 

 

 



Universal controller Type VRU-M1-M/B TR




Measurement principle


Static, independent of the transducer's installation orientation

Nominal voltage

AC/DC 24 V
Nominal frequency50/60 Hz

Functional range

AC 19.2 – 28.8 V/DC 21.6 – 28.8 V

Power requirement (normal operation/when idle)



1.5 W


Power rating

2 VA

Power rating - note

Imax 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

By others, with Smartphone 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 classIII (protective extra-low voltage)
Protection levelIP 42

EMC

CE according to 2014/30/EU

* Factory setting.





Actuator with spring return NF24A-VST TR


Supply voltageFrom the controller
Power consumption – when running

5 W


Power rating

8 VA


Self-consumption (idle state)

2.5 W


Torque

10 Nm


Run time for 90°

120 s/90°


Run time of emergency setting function

<20 s/90°


Setpoint value signal inputFrom the controller
IEC protection classIII (protective extra-low voltage)
Protection level

IP 54

EMC

EMC to 2014/30/EU
Weight

2.3 kg


Manual adjustmentUsing crank handle and position lock


 



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, qvmaxR, WR, WR, W


Actual value signal 0 - 10 V DC, 2 - 10 V DC


R, WR, W
Setpoint value setting analogue, BusR, WR, W
Modbus, BACnetR, WR, W
MP busR, WR, W
Set bus parametersR, WR, W
Carry out override controls

No

NoNo
Trend display

Yes

Yes

R,W = Function can be read and written.

- = Function is not available for the service tool.



 



Communication interface Modbus RTU

NumberRegister AddressDescriptionRange EnumerationUnitScalingAccess
1

Setpoint value between 


qvmin/Δpmin (reg. address 105) and


qvmax/Δpmax (reg. address 106)

(*1) (*2) (*3) (*4)

0 – 10,000

Factory setting: 0

%

0.01[R / W]
21

Override control


 


Overwrites the setpoint value with override control

0: None

1: OPEN

2: CLOSED

3: qvmin/Δpmin

5: qvmax/Δpmax

Factory setting: None

WR
32

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
43

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
54

Current damper blade position acc. to mechanical limits


 


(*5)

0 – 10,000

%

0.01RD
65

Blade angle acc. to angle range


 


(*5)

0 – 9,600

°

0.01RD
76

Relative volume flow rate related to qvnom (reg. address 110)


 


(*6)

0 – 15,000

%

0.01RD
87

Absolute volume flow rate

 

(*6)

0 – qvnom

m³/h

 

1RD
98

Sensor value (voltage, resistance, switch)


Value dependent on the setting of the sensor type (reg. address 107)

0 – 65,535

 

mV,


Ω,


0/1

0.1RD
109

-[–]
1110

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

0.001RD
1211

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

0.001RD
1312

Analogue setpoint value 

 

Shows the setpoint value in % with analogue control input signal. Active if reg. address 118 = 0 (analogue)

0 – 10,000

%

0.01RD
5150

Relative differential pressure 


 


According to application case as per (reg. address 128)

0 – 20,000

%

0.01RD
5251

Absolute differential pressure

-1,000 – 15,000

[Pa]

0.1RD
5352

[–]
5453

Absolute differential pressure in selected unit (reg. address 145)


(Low word) < 16 of 32 bit

-10,000,000 – 100,000,000

UnitSel

0.001RD
5554

Absolute differential pressure in selected unit as per (reg. address 145) 


 


(High word) > 16 of 32 bit

-10,000,000 – 100,000,000 

UnitSel

0.001RD
10099

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
101100

Serial number, part 1


Example: 00839-31324-064-008


1st part: 00839


2st part: 31324


3st part: 008

RD
102101

Serial number, part 2

RD
103102

Serial number, part 3

RD
104103

Firmware version

Example: 101, version 01.01.

RD
105104

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
106105

Setting work areas qvmin/Δpmin 


 


Requirements: qvmin/Δpmin < qvmax/Δpmax


Vmax in the area 0 – 100 % of qvnom/Δpnominal

0 – qvmax/Δpmax

 

%

0.01WR
107106

Setting work areas qvmax/Δpmax 

 

Requirements: qvmax/Δpmax < qvmin/Δpmin

Vmax in the area 20 – 100 % of qvnom/Δpnominal

2,000 10,000  

 

%

0.01WR
108107

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
109108

Bus timeout monitoring 

 

If there is a bus timeout, the actuator moves into a position specified here. 

The position is mech. limited, qvmin/Δpmin and qvmax/Δpmax 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

%

0.01WR
110109

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

1WR
113112

Nominal volume flow rate in selected volume flow unit acc. (reg. address 117)


 


(Low word) < 16 of 32 bit

0 – 60,000,000

UnitSel

0.001RD
114113

Nominal volume flow rate in selected volume flow unit acc. (reg. address 117)


 


(High word) > 16 of 32 bit

0 – 60,000,000

UnitSel

0.001RD
115114

[–]
116115

[–]
117116

Control mode

0: Position control (open loop)

1: Volume flow control

Factory setting: Volume flow control 

[R]
118117

Unit selection –


 


Unit selection for reg. address 11 and 12

0: –

1: m³/h

2: l/s

3: –

4: –

5: –

6: cfm

-

WR
119118

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
120119

Pressure operating mode 

 

Only for VRU-M1R-M/B TR.

0: Negative pressure

1: Positive pressure

 

WR
121120

 

[–]
122121

[–]
123122

[–]
124123

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
125124

Applications

 

 

0: Volume flow control

1: Pressure control

2: Room pressure control

3: Flow measurement

RD
126125

Unit height

0 – 3,000

Factory setting: 0

m

1WR
127126

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
128127

[–]
129128

Nominal differential pressure in Pa 

 

If reg. address 124 = 0 (volume flow control), then reg. address 110 as qvnom.

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

0.1RD
146145

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 nameTROX GmbH
Vendor ID

329

Product nameVRU-D3-BAC, VRU-M1-BAC, VRU-M1R-BAC
Product model numberVRU – BAC
Application software version

01.02.0001

Firmware revision

10.02.0000

BACnet Protocol Revision

12

Product descriptionController for VAV/CAV and pressure applications
BACnet Standard Device ProfileBACnet 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 CapabilityNo
Data Link Layer OptionsMS/TP master, baud rates: 9600, 19200, 38400, 76800, 115200
Device Address BindingNo static device binding supported
Networking OptionsNone
Character Sets SupportedISO 10646 (UTF-8)
Gateway OptionsNone
Network Security OptionsNon-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
  1. Object name 32 characters
  2. Location 64 characters
  3. 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 NameObject TypeDescriptionValuesCOV IncrementAccess
Device

Device [Inst.No]

0 – 4,194,302

Factory setting: 1

WR
RelPosAI[1]

Damper blade position in %

 

Status flags: (*1), (*2)

0 – 100

0.01 – 100

Factory setting: 1

RD
AbsPosAI[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
SpAnalogueAI[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
RelFlowAI[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_UnitSelAI[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
Sens1AnalogueAI[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
SpRelAO[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
MinAV[97]

Minimum setpoint value in % (qvmin/Pmin)

 

Requirement:

qvmin/Δpmin < qvmax/Δpmax

qvmin/Δpmin in the range 0 - 100 & qvnom/Δpnom

0 – qvmax/Δpmax

 

0.01 – 100

Factory setting: 1

WR
MaxAV[98]

Maximum setpoint value in % (qvmax/Pmax)

 

Requirement:

qvmax/Δpmax > qvmin/Δpmin

qvmax/Pmax in the range 20 - 100 % of qvnom/Pnom

qvmin/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
BusWatchdogAV[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
Sens1SwitchBI[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
BusTerminationBI[99]

Terminal resistor 

 

Shows whether the terminal resistor (120 Ω) has been activated via the service tools.

 

0: Deactivated

1: Activated

RD
SummaryStatusBI[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: qvmin/Δpmin

5: –

6: qvmax/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

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For general question regarding products or services you can also call:
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