Belimo VRP-M Product Information

Product information VRP-M VAV system

www.belimo.eu Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes 1 / 28

Table of Contents

Overview of the system

2

System description

3

Technical data sheets

VRP-M adaptive, digital PID VAV controller
Application
Functions
System configuration
Operating data settings (with VRP-M-Tool)
Connection of the VRP-M-Tool
Bus operation

VFP-.. static differential pressure sensors for neutral to slightly aggressive gases
Fast-running damper actuator for VRP-M system solution NMQB24-SRV-ST
Damper actuator for VRP-M system solution NM24A-V-ST

7
8

9
12
13
15
16

19
21
23

Dimensions

25

Adaptive VAV control system
for sensitive working areas

MP

BUS

®

TECHNOLOGY BY BELIMO

VRP-M VAV

Overview of the system

2 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu

Pressure sensors for

static differential pressure measurement

VFP-100 VFP-300 VFP-600

Pressure range 0 ... 100 Pa 0 ... 300 Pa 0 ... 600 Pa
Medium

– Slightly dusty air
– Very dusty air
– Corrosive gases

●

●
*

●

●
*

●

●
*

Power supply From VRP-M From VRP-M From VRP-M
VRP-M connection Ready to connect Ready to connect Ready to connect

* For a list of sensor materials that come into contact with the medium,

see «Technical data» for the VFP-.., page 19

Damper actuators

NMQB24-SRV-ST NM24A-V-ST

Torque 4 Nm 10 Nm
Speed < 5 s 110 ... 150 s
Power supply From VRP-M From VRP-M
VRP-M connection Ready to connect Ready to connect

VAV functions

Application

Volumenstrom

VAV / CAV

Pressure

STP

VAV: 

min

... 

max

●

CAV: 

min

/ 

mid

/ 

max

●

Override functions:
Open – closed

●

Extraction systems ●
Laboratory exhaust systems ●
Bus integration ● ●
Fan optimisation ●

Modulating pressure:
P

min

… P

max

●

Stepped pressure: P

min

/ P

max

●

Override functions OPEN / CLOSE

●

Motor stop function ●

System components

VRP-M control solution

VRP-M

VAV / CAV STP

Power supply AC/DC 24 V AC/DC 24 V
Modulating control 0 ... 10 / 2 ... 10 V 0 ... 10 / 2 ... 10 V

0 ... 20 / 4 ... 20 mA 0 ... 20 / 4 ... 20 mA
Stepped control Contacts, switches Contacts, switches
Bus function

MP

BUS

®

TECHNOLOGY BY BELIMO

MP

BUS

®

TECHNOLOGY BY BELIMO

– Optimiser COU24-A-MP ●
– LONW

ORKS

®

integration

● ●

– EIB/Konnex integration

● ●

Settings, diagnostics VRP-M-Tool VRP-M-Tool

www.belimo.eu

Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes

3 / 28

System components

Controller

VRP-M adaptive, digital PID VAV controller
for every application

Pages 7 ... 18

Sensor

Pressure sensors for static differential pressure measurement
– VFP-100 with 0 ... 100 Pa measuring range
– VFP-300 with 0 ... 300 Pa measuring range
– VFP-600 with 0 ... 600 Pa measuring range

Pages 19 ... 20

Actuator

– NM24A-V-ST damper actuator for standard applications

1)

– NMQB24-SRV-ST damper actuator for fast-running applications

1)

Pages 21 ... 24

1)

Please contact your Belimo representative for other actuator solutions, e.g. spring return.

Brief description

Application

This ready-to-connect system solution is an efficient control system for pressure-independent,
standard and fast-running air volume applications.

Field of application

The system can be used for controlled extraction of contaminated or slightly aggressive air 1) in closed
rooms:
– Exhaust air systems for laboratory workplaces *
– Laboratories in chemical and pharmaceutical plants *
– Hospital buildings *
In combination with the NMQB24-SRV-ST fast-running actuator, this system is particularly suited to
laboratory applications *:
– Digesters *
– Extraction of contaminated air *

* Air compatibility verification essential (see «Technical data» for the VFP-... sensors, page 19).

Function

The pressure differential at the static pressure sensor is converted into a volumetric flow signal with
a linear throughflow and serves as the actual value x for the adaptive PID-VAV controller. The volu­metric flow signal (0 ... 100% 

nom

) can be picked off at the VRP-M, controller connection U5, as a

0 ... 10 / 2 ... 10 V signal.
The actual value x is compared with the setpoint w set on the VAV controller and the connected
damper actuator is controlled according to the resulting system deviation. The VRP-M controller can
be controlled according to its function as a CAV constant controller (

min

/

max

) or a VAV controller via

the reference value input w with a modulating 0 ... 10/2 ... 10 V signal in the range from 

min

... 

max

.

Control inputs with OPEN/CLOSE/

mid

functions are available for special applications.

The VRP-M can be integrated into an MP system via the MP-Bus connection.

Ready-to-connect system solution for

• Pressure-independent VAV and CAV
systems, e.g. in laboratories

• Fast-running VAV and CAV applica­tions, e.g. in digesters or generally for
extracting contaminated or slightly ag­gressive air in closed rooms

Control:
DC 2 ... 10 V / 0 ... 10 V or bus

Integration into

• DDC controller with MP interface

• EIB Konnex systems

• LONWORKS® systems

Settings and diagnostics
with VRP-M-Tool

System description VRP-M VAV system

VRP-M

VFP-..

NMQB24-SRV-STNM24A-V-ST

VRP-M VAV

Ready-to-connect system solution

4 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu

Safety notes

!

• The VRP-M system solution is not allowed be used for applications outside the specified field
of application, especially in aircraft or in any other airborne means of transport.

• Only components explicitly approved for this purpose by Belimo are allowed to be used for
the VRP-M system solution.

• The equipment configuration and settings form part of the unit manufacturer‘s system solu­tion (OEM) and are not allowed to be modified without prior authorisation. All changes are
liable to disrupt operation and cause damage to the system or injury to persons!

• Attention must be paid to the following during the planning phase and before the VRP-M
system solution is operated:

– The compatibility of the VFP-.. sensor with the medium to be controlled must be verified,
– The specifications supplied by the VAV unit manufacturer (design, installation site) must

be consulted,

– All local regulations must be observed.

• Applications with fast-running actuator NMQB24-SRV-ST: The actuator moves into the
«CLOSED» position (left or right end stop, depending on the position of the direction of rota­tion switch) when the supply voltage is switched on, in the event of a power failure >5 s or if
the pushbutton is actuated again. It then moves into the position required by the system. The
VRP-M control function is inoperative during this procedure.

• If the VRP solution is operated in a bus system, the cycle times of the MP-Bus and the
higher-level system must be taken into account.

• The manufacturer of the VAV unit (OEM) is responsible for ensuring that the VRP-M-system
solution is installed and set correctly as well as for the overall precision of the VAV unit.
If replacement devices are ordered, they are configured by the OEM at the factory according
to the installed system.
The VRP-M system solution is sold exclusively via the OEM channel for this reason.

System characteristics

Control characteristics

Adaptive, digital PID VAV controller (see «System components», page 3).

Pressure measurement

Static Belimo pressure sensors (see «System components», page 3).

Damper actuators

Belimo VAV damper actuators (see «System components», page 3).

Optimally matched components

In addition to standard VAV and CAV applications, the VRP-M system solution is also suitable for
fast-running applications such as those used in laboratories. The solution comprises optimally
matched, ready-to-connect components. These are only permitted for use in the controller-sen­sor-actuator combinations specified by Belimo and selected by the unit manufacturer (see «Sys­tem components», page 3).

VAV – variable air volume

Variable air volume applications based on a modulating reference signal, e.g. supplied by a DDC
controller, room temperature controller, EIB Konnex or LONW

ORKS

®

system.

The reference signal for the 

min

... 

max

working range can be set as follows:

DC 2 ... 10 V / DC 0 ... 10 V / adjustable DC range / bus operation

CAV – constant air volume

Constant air volume applications with operating steps (relays, switching contacts).
The following operating steps are available: CLOSED / 

min

/ 

mid

/ 

max

/ OPEN / bus operation

Bus function

Up to eight Belimo MP devices (VRP-M / VAV-Compact / damper actuator / valve) can be con­nected via the MP-Bus and integrated into the following systems:
– DDC controller with integrated MP-Bus protocol
– EIB Konnex system with Belimo UK24EIB interface
– LONW

ORKS

®

system with Belimo UK24LON interface

See pages 16...18

Diagnostics tool

VRP-M-Tool, plugged either directly onto the VRP-M VAV controller or via a terminal in the cont­rol cabinet (connection 4 – PP/MP)

Version overview – VRP-M system solution

Refer to www.belimo.eu for current information about compatibility, versions and functions.

VRP-M VAV

Ready-to-connect system solution

www.belimo.eu Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes 5 / 28

Electrical installation

Wiring diagrams: VAV operation Example 1:

With analogue reference signal

Example 2:

DC 0 ... 10 V with shut-off (CLOSED)

Conventional operation:

See pages 10 and 11 for a description of

functions such as control priority

AC 24 V
DC 24

V

~

T

+

_

T

4321 VRP-M

MPw

~

T

+

_

5 6 7

U5 z1 z2

VFP-...NM...-ST

VRP-M

Tool

4321 VRP-M

MPw

~

T

+

_

5 6 7

U5 z1 z2

VFP-...NM...-ST

VRP-M

Tool

+

DC 24

V

_

AC 24 V
DC 24

V

~

T

+

_

T

Example 3:

DC 0 ... 10 V with shut-off / parallel control

4321 VRP-M

MPw

~

T

+

_

5 6 7

U5 z1 z2

VFP-...NM...-ST

VRP-M

Tool

+

DC 24

V

_

AC 24 V
DC 24

V

~

T

+

_

4321 VRP-M

MPw

~

T

+

_

5 6 7

U5 z1 z2

VFP-...NM...-ST

VRP-M

Tool

+

DC 24

V

_

T

Example 4:

With bus control

Beispiel 5:

Typical application: MP with shut-off (CLOSED)

Bus control:

See pages 16 to 18 for a description of functions

MP

~

T

+

_

AC 24

V

DC 24

V

4321 VRP-M

MPw

~

T

+

_

5 6 7

U5 z1 z2

VFP-...NM...-ST

VRP-M

Tool

MP

~

T

+

_

AC 24

V

DC 24

V

4321 VRP-M

MPw

~

T

+

_

5 6 7

U5 z1 z2

VFP-...NM...-ST

VRP-M

Tool

Reference value input w
0 ... 10 / 2 ... 10 / adjustable

PP/MP communication

Volume flow actual value U5
0 ... 10 / 2 ... 10 / adjustable

Control input z

PP/MP communication

Volume flow actual value U5
0 ... 10 / 2 ... 10 / adjustable

CLOSED (shut-off)

ZU (Absperrung)

CLOSED (shut-off)

Reference value input w
0 ... 10

Note

– Supply via safety isolation transformer!
– We recommend routing connections 1, 2

(AC/DC 24 V) and 4 (MP signal) to accessible
terminals (floor distributor, control cabinet, etc.),
in order to simplify access with the VRP-M-Tool
for diagnostic and service work.

!

VRP-M VAV

Ready-to-connect system solution

6 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu

Commissioning

Prerequisites

– The VAV / CAV unit must be mounted
– The VRP-M system solution must have been set and calibrated for the VAV / CAV unit by the

unit manufacturer

– The electrical connection must have been made and checked
– The 24 V supply and control must be ready for operation
– The system fan must be in operation

Procedure

– Check the electrical connection
– Check the zero offset of the pressure sensor
– Check the damper mobility
– Check the supply pressure (the system fan must be in operation and calibrated)
– Check the 

min

/ 

max

settings and correct them if necessary

– Check the control signal setting and adjust it if necessary

Angle of rotation adaptation

The angle of rotation must be adapted whenever the angle of rotation limiting of the
NMQB24-SRV-ST damper actuator is adjusted.
Procedure:
– Switch on the 24 V supply
– Press the manual override pushbutton twice

The actuator moves into the CLOSED...OPEN...setpoint position

VFP-.. static pressure sensor

Zero offset

– Disconnect both (!) hose connections from the

sensor

– Remove the cover of the VFP-.. sensor

housing

– Turn the zero potentiometer inside the VFP‐..

until the LED in the VRP-M [p>0] lights up

– Turn the zero potentiometer back until the LED

goes out again

Zero potentiometer VFP-100

Note
Fast-running damper actuator NMQB24-SRV-ST

A synchronisation is performed after the power sup

-

ply is switched on or after the manual disengage

­ment is actuated; this means the actuator moves to
CLOSED and returns to its nominal position.

Zero potentiometer VFP-300

VFP-600

Electrical installation

(Continued)

Wiring diagrams: CAV operation Example 1: Example 2:



min

– 

max

– OPEN

See pages 10 and 11 for a description of function

Note

– Supply via safety isolation transformer!
– We recommend routing connections 1, 2

(AC/DC 24 V), 4 (MP signal) and 5 (U5 signal)
to accessible terminals (floor distributor, control
cabinet, etc.), in order to simplify access with the
VRP-M-Tool for diagnostic and service work.

!

4

3

2

1 VRP-M

MPw

~

T

+

_

5

6

7

U5 z1 z2

VFP-...NM...-ST

VRP-M

Tool

+

DC 24

V

_

AC 24 V
DC 24

V

~

T

+

_

4

3

2

1 VRP-M

MPw

~

T

+

_

5

6

7

U5 z1 z2

VFP-...NM...-ST

VRP-M

Tool

+

DC 24

V

_

AC 24 V
DC 24

V

~

T

+

_

* Function not available with DC 24 V supply.

PP/MP communication

Volume flow actual value U5
0 ... 10 / 2 ... 10 / adjustable

CLOSED

OPEN



min



max

OPEN (damper open)



min



max

PP/MP communication

Volume flow actual value U5
0 ... 10 / 2 ... 10 / adjustable



mid

*

LED ∆p>0

VRP-M

Technical data sheet VRP-M VAV controller

www.belimo.eu Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes 7 / 28

Adaptive digital PID VAV controller
for VRP-M system solutions

• For pressure-independent VAV and
CAV systems

• Control:
DC 0 ... 10 V / 2 ... 10 V or bus

• Diagnostics socket for VRP-M-Tool

Technical data

Electrical data

Nominal voltage AC 24 V, 50/60 Hz

DC 24 V
Power supply range AC ±20% / DC ±10%
Power consumption In operation

For wire sizing

1.1 W (incl. VFP-.. sensor, without actuator)

2.6 VA (incl. VFP-.. sensor, without actuator)

Connection Actuator
Pressure sensor
Terminals 1 ... 7
VRP-M-Tool

Plug, 6-pin

Plug, 4-pin

Screw terminals, 7-pin, 0.5 mm2 ... 1.5 mm

2

Plug, 3-pin

Functional data

VAV reference signal w (terminal 3)
Range: 

min

... 

max

Input impedance >200 kΩ

– DC 0 ... 10 / 2 ... 10 V or

– 0 ... 20 / 4 ... 20 mA (with 500 Ω resistance)
Volumetric flow actual value U5 (terminal 5)

Range 0 ... 100% 

nom

DC 0 ... 10 / 2 ... 10 V, max. 5 mA

OPEN operating step – z1 (terminal 6) OPEN, input impedance >300 kΩ
CAV operating steps z2 (terminal 7) CLOSED / 

min

/ 

mid

/ 

max

, contact current <1 mA
Control characteristics PID, adaptive
Control tolerance ±5% of 

nom

Ranges 

nom



max



min

*



mid

(intermediate position) **

Nominal volumetric flow (manufacturer-specific)
30 ... 100% of 

nom

0 ... 100% of 

nom

0 ... 100% of 

min

... 

max

LED indicator AC/DC 24 V supply

Volume too high / too low, sensor zero

MP-Bus function (terminal 4) ***
Address in bus operation
Functionality

MP 1 ... 8 (classic control: PP)
Adjustable with VRP-M-Tool and address pushbutton
Slave

Operation / service VRP-M-Tool

Safety

Protection class III Safety extra-low voltage
Degree of protection IP42
EMC CE according to 89/336/EEC
Mode of operation Type 1 (to EN 60730-1)
Ambient temperature range 0 ... +50°C
Non-operating temperature –20 ... +80°C
Ambient humidity range 5 ... 95% r.H., non-condensating (EN 60730-1)
Maintenance Maintenance-free

Dimensions/weight

Dimensions See «Dimensions» on page 25
Weight Approx. 250 g (without sensor)

* See «Creep flow limitation and minimum setting limit», page 9
** Not available with DC 24 V supply
*** For bus operation, see pages 16...18

VRP-M VAV

Adaptive VAV controller

8 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu

Safety notes

!

• The controller is not allowed to be used outside the specified field of application, especially
in aircraft or in any other airborne means of transport.

• The device does not contain any parts that can be replaced or repaired by the user.

• The manufacturer of the VAV unit (OEM) is responsible for ensuring that the VRP-M­controller is installed and set correctly as well as for the overall precision of the VAV unit. If
replacement devices are ordered, they are configured by the OEM at the factory according to
the installed system.
The VRP-M controller is sold exclusively via the OEM channel for this reason.

• The device contains electrical and electronic components and is not allowed to be disposed
of as household refuse. All locally valid regulations and requirements must be observed.

Application

Together with the VFP-.. static pressure sensor and a Belimo NM..-ST actuator, the VRP-M
forms a control system for pressure-independent variable (VAV) and constant (CAV) air volume
controls.
For more information, see «VRP-M system», pages 3 ... 6

Electrical connections

Front panel

Assignment of terminals 1 ... 7

Terminals 1 ... 7

for supply and control

Tab connection for
damper actuator

Tab connection for
pressure sensor

Diagnostics socket for VRP-M-Tool

AC 24 V
DC 24

V

~

T

+

_

1

2

3

4

5

6

7

T

~

+

MPw U5 z1 z2

VAV reference signal 

min

... 

max

PP/MP signal
Volumetric flow actual value 0 ... 100% 

nom

OPEN operating step
CAV operating step CLOSED / 

min

/ 

mid

/ 

max

LED indicator and address pushbutton

PWR Green LED LED on:

– AC/DC 24 V supply OK
– Device ready

LED off:
– Supply failure
– Device defective

Blinking

– If Set pushbutton pressed during MP adressing

+ Red LED LED on:

– Volumetric flow > setpoint = damper closes
or is closed

– Red LED LED on:

– Volumetric flow < setpoint = damper opens
or is open

∆p>0 Yellow LED Zero offset of VFP-.. pressure sensor

(refer to page 6 for procedure)

Set Pushbutton for assigning MP address in bus operation

(refer to page 18 for procedure)

VRP-M VAV

Adaptive VAV controller

www.belimo.eu Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes 9 / 28

Functions

Nominal volumetric flow 

nom



nom

corresponds to the maximum volumetric flow of the VAV unit at which the pressure drop

and noise are still within the permissible operating conditions. The 

nom

values are specified and
fixed-programmed by the unit manufacturer.
The volumetric flow actual value signal U5 is always in relation to 

nom

. Changes in the opera-

ting volumetric flow settings 

min

and 

max

therefore have no influence on the U5 voltage signal.

Creep flow limitation

Minimum setting limit 

max

Creep flow limitation (1)

This function suppresses differential pressure signals in the zero region. Undefined actuator mo­vements in the 1 ... 6 Pa differential pressure range are prevented by this limitation. The working
range is physically limited owing to the dynamic behaviour of the differential pressure sensor and
the flow pattern of the media.

Sensor type Limitation

VFP-100 1 Pa
VFP-300 3 Pa
VFP-600 6 Pa

Unit manufacturer’s minimum setting limit (2)

Oversized VAV units can make control more difficult in the lowest differential pressure range.
A minimum volumetric flow, usually corresponding to a differential pressure of approximately
5 ... 12 Pa, is therefore specified for the units by the manufacturer. Functional restrictions in this
range can be avoided by complying with the unit manufacturer’s volumetric flow setting.

0/2

10

[V]

2

30%

0%

100%

100%

2

1

a

b

c

a

b

c

1

Start point

End point



nom

Volumetric flow [

nom

]

Volumetric flow actual value signal U5 [V]

Setting

[

min

]

Setting

[

max

]

Reference signal w

Optimum range
Setting with restriction
Setting with greatest

restriction

Creep flow limitation <2 Pa
Unit manufacturer’s minimum setting limit

0 ... 10 V
2 ... 10 V
adjustable

VRP-M VAV

Adaptive VAV controller

10 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu

Functions

(Continued)

Control tolerance

The maximum permissible control tolerance is defined as a percentage of the nominal volumetric
flow nom. If the system deviation exceeds or undershoots this tolerance, the actuator is adjusted
so that the volumetric flow actual value corresponds to the required setpoint.
Control tolerance: ±5% of 

nom

The two LEDs [+p] and [-p] indicate when the maximum control tolerance is exceeded or under­shot or when the deviation is being corrected by means of an actuator movement:
LED [+p]: Volumetric flow actual value > (setpoint + control tolerance) = damper closes
LED [-p]: Volumetric flow actual value < (setpoint + control tolerance) = damper opens

VAV operating volumetric flow



min

... 

max

setting

In variable operation, the volumetric flow is specified by means of the reference signal in the


min

... 

max

range.

– 

max

forms the upper limit value as a function of the nominal volumetric flow.

Range 30 ... 100% of 

nom

.

– 

min

forms the lower limit value as a function of 

nom

.

Range 0 ... 100% of 

nom

.

Voltage level

0,0

10

0,0

0,1

10

2,0



min

 0…10 V

2…10 V

max



max



min

In mode 2 ... 10 V, it is possible to achieve shut-off mode (damper CLOSED) by lowering the
reference signal to 0.0 V.

For override control in VAV operation, for example CLOSED or OPEN, the reference signal w
(input 3) can be overridden by connecting control inputs 6 (z1) and 7 (z2).

CAV operating steps

CLOSED / 

min

/ 

mid

/ 

max

/ OPEN

Five operating steps are available for step operation:
– Shut-off operation – damper CLOSED: The damper is moved into the CLOSED position in a

defined manner.

– Operating steps 

min

/ 

mid

/ 

max

: The VRP-M adjusts the volumetric flow to the fixed selected

value.

– Flushing operation – damper OPEN: The damper can be opened for maximum ventilation, in

which case air volume control is deactivated.

The operating mode control signals are connected to inputs 6 (z1) and 7 (z2). If signals appear
at these two inputs simultaneously, input 6 (z1) for the OPEN function takes priority.

Reference signal w

[V]



nom



max

[

min

]

Variable operation

Volumetric flow [% 

nom

]

Volumetric flow actual value signal U5 [V]

Example: 0 ... 10 V mode

< Modulating operation >

Start point End point

Shut-off

[

max

]

Mode:

CLOSED

< Modulating operation >

VRP-M VAV

Adaptive VAV controller

www.belimo.eu Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes 11 / 28

Functions

(Continued)

Note



mid

is not available with DC 24 V supply.

100%

30 40 50 60 70 80 90

0

100

10

20

30

50

60

70

80

90

40

VAV override operation

CLOSED / 

min

/ 

mid

/ 

max

/ OPEN

If necessary, the VAV 

min

... 

max

range can be overridden by fixed operating steps in VAV ap-

plications.
The following operating steps are available:

– Shut-off operation – damper CLOSED: The damper is moved into the CLOSED position in a

defined manner.

– Operating steps 

min

/ 

mid

/ 

max

: The VRP-M adjusts the volumetric flow to the fixed selected

value.

–

Flushing operation – damper OPEN: The damper can be opened for maximum ventilation, in
which case air volume control is deactivated.

Note

– 

min

: All inputs (3 / 6 / 7) open.

– 

mid

is not available with DC 24 V supply.

8

6

2

4

30

40

100%

30 40 50 60 70 80 90

0

100

10

20

50

60

70

80

90

10

0

10

2

4

6

8

Priorities for reference value input 3 (w)

and control inputs 6 (z1) / 7 (z2)

If several signals appear simultaneously, they are processed acc. to the following priorities:

Terminal Priority Function

6 z1 1 OPEN
7 z2 2 CLOSED / 

min

/ 

mid

/ 

max

3 w 3 

min

… 

max

Reference signal w

[V]

CAV operating mode

OPEN
(depending on supply pressure)



nom



max



mid



min

CLOSED

[

min

]

Volumetric flow [% 

nom

]

[

max

]

Volumetric flow [% 

nom

]

[

max

]

ZU

OPEN



nom



max



mid

[

min

]

Constant operation

Variable operation

Constant operation



min

Volumetric flow actual value signal U5 [V]

Example: 2 ... 10 V mode

VRP-M VAV

Adaptive VAV controller

12 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu

System configuration

Unit manufacturer’s settings

The system solution selected by the unit manufacturer is mounted by the latter on the VAV unit
and configured according to the system requirements (as stated in the order). This configuration
comprises the following settings.

VRP-M Tool

Expert tab

System information

Function

Volumetric flow

Sensor

The pressure sensor type is specified to enable the pressure range to be adapted.

Actuator

The actuator type is specified to enable the running time characteristics to be adapted.

Control – reference signal w,

volumetric flow actual value signal U5

The reference signal w and the volumetric flow actual value signal U5 are adapted to the MCR
system.
Selection: DC 0...10 V / DC 2...10 V / adjustable (sequence matching in the 0...10 V range)

Calibration – 

nom

The 

nom

values are specified and fixed-programmed by the unit manufacturer.

Each VRP-M system solution is optimally adapted to the VAV unit by means of the 

nom

setting.



nom

corresponds to the maximum volumetric flow of the VAV unit at which the pressure drop

and noise are still within the permissible operating conditions. The 

nom

setting is specified by

the unit manufacturer.

0

10

2

4

6

8

NW...

NW...

NW100

NW...

Replacement orders

If replacement devices are ordered, they must be parameterised beforehand by the OEM at the
factory according to the installed system. The VRP-M is sold exclusively via the OEM channel for
this reason.

Note

The equipment configuration and settings form part
of the unit manufacturer’s system solution (OEM)
and are not allowed to be modified without prior
authorisation. All changes are liable to disrupt opera

­tion and cause damage to the system or injury to
persons!

Volumetric flow

actual value signal U5

[V]

Volumetric flow [

nom

]



nom

Smallest
nominal width

Largest
nominal width

OEM unit range

VRP-M VAV

Adaptive VAV controller

www.belimo.eu Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes 13 / 28

VRP-M Tool – Operating data settings

Adjustments on the system with VRP-M-Tool

The VRP-M-Tool can be used to adjust the operating data (

min

, 

mid

, 

max

settings) and the
reference signals (mode setting – voltage range) directly on the system if necessary. The VRP­M-Tool adapter must be connected to the diagnostics socket on the VRP-M or to the MP connec­tion routed to the terminals for this purpose (see Note on page 15).

VRP-M-Tool
Service tab

1 Identification
2 Operating volumetric flow settings
3 System designation entry
4 Volumetric flow

5 Operational test:

Reference signal
Differential pressure [pascal]
Setpoint / actual value [m3/h, l/s]
Selected operating mode:
– AUTO / CLOSED / OPEN
– 

min

/ 

mid

/ 

max

/ 

nom

– Variable setpoint (

min

... 

max

)

Operating volumetric flow settings

These parameters are used to set the VAV unit to the air volumes required for each application.
The settings are based on the air volumes calculated by the planning engineer and can either be
preset by the VAV unit manufacturer or adjusted on the system using the VRP-M-Tool.



max

Range 30...100% of 

nom

Upper volumetric flow limit



min

Range 0 ...100% of 

nom

Control range x * ...100% of 

nom

Lower volumetric flow limit

Shut-off operation (CLOSED) according tomin setting

If a shut-off function is required in VAV operation, it can be achieved by setting 

min

0%.



mid

Range 0 ...100% of 

min

... 

max

An intermediate position 

mid

is available for constant air volume (CAV) applications to facilitate

finer steps.

* 

min

settings lower than the control range



min

values that are lower than the start value indicated in this range can be set, for example, if the

VAV unit has a shut-off function

System designation entry

Input field (16 characters) for specific system designations, e.g. MCR address, system name,
item number in diagram, etc.

1

3

2

5

4

VRP-M VAV

Adaptive VAV controller

14 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu

VRP-M Tool – Operating data settings

(Continued)

VRP-M-Tool

Expert tab

1 Mode setting

Standard 0 ... 10 / 2 ... 10 V

2 Control

System-specific settings

– Reference signal w
– Volumetric flow actual value signal U5

3 VRP-M system information

– VRP-M

Version and conductance setting
– Volumetric flow function
– Sensor type
– Actuator type

Mode setting

Options: 0... 10 V / 2...10 V / system-specific
The mode setting acts on the reference signal w and the volumetric flow actual value signal U5.
Variable settings are displayed here and can also be reset by selecting 2 ... 10 / 0 ... 10 V. Vari­able settings are entered in the «Control» field above.

Control

Variable setting

It is sometimes essential to adapt the reference signal w or the volumetric flow actual value sig­nal U5 to the MCR system directly on the control system.
The reference signal w and the volumetric flow actual value signal U5 can be set to different val­ues (e.g. reference signal w: 2...10 V / actual value signal U5: 0...10 V).

Reference signal [w] / working range 

min

... 

max

Start point: DC 0.0 ... 8 V
Stop point: DC 2.0 ... 10 V

Volumetric flow actual value signal [U5] / display range 0...100% 

nom

Start point: DC 0.0 ... 8 V
Stop point: DC 2.0 ... 10 V

1

2

3

VRP-M-Tool – Availability

The current version of the VRP-M-Tool and the associated documentation can be downloaded
from www.belimo.eu.

VRP-M VAV

Adaptive VAV controller

www.belimo.eu Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes 15 / 28

Connection of the VRP-M-Tool

The VRP-M-Tool required for settings and servicing can be connected either directly to the 3-pin service socket on the VRP-M controller or via
the MP connection (terminal 4). A level converter is required for communication, e.g.: ZIP-RS232.

Conventional operation (PP)

VRP-M runs with a locally connected reference signal (0 ... 10 V on connection 3). VRP-M detects that there is no tool connected and switches
back to the connected analogue reference signal automatically after 120 s.

VRP-M

AC 24 V

ZIP-RS232

1

2

5

OFF

Actuator

RS232

ON

U

PP

~

T

AC 230 V

ZN230-24

VRP-M

Tool

~

T

+

_

4.21

AC/DC 24 V

VRP-M

. . .

124

ZIP-RS232

1

2

5

OFF

Actuator

RS232

ON

U

PP

~

T

AC 230 V

ZN230-24

VRP-M

Tool

24 VAC

MP-Bus mode

VRP-M runs in the MP system, which means it obtains its reference signal via the connected MP master, e.g. UK24LON.
The VRP-M-Tool can only be connected via the bus master in MP mode, otherwise there would be two MP masters connected to the MP-Bus.
This means the local connection to the VRP-M cannot be operating at the same time as the MP master.

MP 1

MP-Bus

MP ..

UK24LON

2

MP 8

MP ..

AC 24 V

ZIP-RS232

1

2

5

OFF

Actuator

RS232

ON

U

PP

~

T

AC 230 V

ZN230-24

VRP-M

Tool

-

+

-

+

Note

• The service plug integrated in the VRP-M is not available with bus operation.

• The MP-Bus cannot be used to transmit control functions if it is also used to
connect the VRP-M-Tool.
Workaround: Disconnect the MP-Bus (terminal 4) and use the local MP plug
instead.

AC/DC
24 V

Connection in control cabinetConnection via service socket

LON application with UK24LON

VRP-M VAV

Adaptive VAV controller

16 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu

Bus operation

The VRP-M system solution can be interconnected with other Belimo MP actuators (damper
actuators, valve actuators, VAV-Compact controllers, VRP-M system solutions) thanks to the
integrated communication principle over the Belimo MP-Bus. Up to eight Belimo MP devices are
supplied with a digital control signal by the higher-level bus master and then opened to the positi­on dictated by this signal.
The switch-over from conventional to bus operation is automatic as soon as the MP actuator is
assigned an MP address (1...8).
Belimo MP devices can be integrated into the following systems:
– LONWORKS®: The variables of Functional Profile 8110 can be used in conjunction with the

Belimo UK24LON interface.
– EIB Konnex: Can be used with the Belimo UK24EIB interface
– DDC controller with an integrated MP-Bus protocol: Available from several manufacturers

Damper position (From VRP-M version V3.x)

(nvoAbsAngle - absolute actuator position in angular degrees (°))
The feedback signal, i.e. the network variable nvoAbsAngle, is not available for applications with

NM24-V-ST actuators (old actuator generation).

MP-Bus cycle time

The MP-Bus cycle time must be noted when integrating setpoints and actual values. It is typically

2...8 s, depending on the number of connected bus users and integrated sensors.
The local VRP-M control function is not affected by the cycle time. The cycle time of the MP-Bus
must always be taken into account, however, when selecting setpoints via the MP-Bus.

Mode of operation

Sensor integration (From VRP-M version V3.x)

The VRP-M can be connected to an additional active 0 ... 10 V signal in MP-Bus mode inde­pendently of the VAV control loop. The sensor signal is connected to the reference value input
that is not used in MP-Bus mode (connection 3).
The VRP-M then acts as an analogue/digital converter for transmitting the sensor signal to the
higher-level system. This system must know the physical address (which sensor is connected to
which MP device) and be capable of interpreting the corresponding sensor signal.

Active sensor connection

MP

4321 VRP-M

PPw

~

T

+

_

5 6 7

U5 y z

~

T

T

+

_

0 … 10

V

DC 24 V

Active 0 ... 10 V sensors for open and closed-loop control functions in the higher-level system,
such as moisture or CO2 sensors. The cycle time must be taken into account in the implementation!
Reference signal w setting if an active sensor is connected: 0 ... 10 V

Integration of switches,

passive resistance sensors

The VRP-M only supports active sensors with a 0 ... 10 V output; i.e. no switches or passive
sensors (resistance elements) can be integrated.

Principle of VRP-M in bus operation

In bus operation, the VRP-M controller receives its reference signal from the higher-level control
system and adjusts the volumetric flow to the fixed selected value in the 

min

... 

max

range.

If necessary, the VAV 

min

... 

max

range can be overridden by fixed operating steps (control
inputs z1 and z2) in bus operation.
The following operating modes are available:
– Shut-off operation – damper CLOSED: The damper is moved into the CLOSED position in a

defined manner.

– Operating steps 

mid

/ 

min

: The VRP-M adjusts the volumetric flow to the fixed selected value.

– Flushing operation – damper OPEN: The damper can be opened for maximum ventilation, in

which case air volume control is deactivated.

Sensor

VRP-M VAV

Adaptive VAV controller

www.belimo.eu Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes 17 / 28

Bus operation

(Continued)

Note



mid

not available with DC 24 V supply.

Operating volumetric flow setting 

min

/ 

max

The setpoint selected over the MP-Bus is resolved by means of the 

min

and 

max

settings on

the VRP-M.

Function Volumetric flow Range



nom

Nominal OEM-specific value, depending on the application and the VAV unit type



max

Maximum 30 ... 100% of 

nom



min

Minimum 0 * ... 100% of 

nom

* The minimum volumetric flow setting 

min

varies according to the type of VAV unit and is also influenced

by the creep flow limitation function (see «Creep flow limitation / minimum setting limit»).

Open operating volumetric flow setting

The 

min

-/

max

setting can be left open if necessary, i.e. 

min

0% / 

max

100%. In this case, the
volumetric flow must be limited in the higher-level system.
This operating setting allows the limitation of the volumetric flow to be adjusted without altering
the parameters on the VAV controller.
Responsibility for the limiting function passes from the unit manufacturer to the system supplier
or integrator.

Priorities for bus signal (MP setpoint)

and control inputs 6 (z1) / 7 (z2)

Note

Note the speed of the MP-Bus!

If several signals appear simultaneously, they are processed according to the following table of
priorities.

Terminal Priority Function
6 z1 1 OPEN
7 z2 2 CLOSED / 

min

/ 

mid

/ 

max

3 MP override function

1 OPEN
2 CLOSED
3 

max

4 

min

5 

mid

6 –
7 

nom

4 MP setpoint 0 ... 100% = 

min

... 

max

Last setpoint

Bus fail function

The VRP-M saves the current setpoint, i.e. the last setpoint to have been received from a bus
master (VRP-M-Tool, UK24LON). If the MP network fails, the connected VRP-M detects this and
retains this setpoint until it receives a new one from the MP master.

Initial setpoint after power failure

The VRP-M starts with its MP initial status (setpoint 0%, corresponding to 

min

setting) if a power

failure occurs in the intervening period.

Reference signal

(e.g. UK24LON nviRelStpt)

[%]

[

max

]

CLOSED

OPEN



nom



max



mid

[

min

]



min

Volumetric flow actual value signal

(e.g. UK24LON nvcActualValue)

Volumetric flow [% 

nom

]

Reference signal

(e.g. UK24LON nviRelStpt)

VRP-M VAV

Adaptive VAV controller

18 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu

MP-Bus

Topology

The cables of up to eight actuators can be laid in a freely definable topology. The following topol­ogies are permitted: Star-shaped, ring-shaped, tree-shaped or mixed forms.

Connection

The network consists of a 3-pin connection (MP communication and 24 V supply). Neither
special cables nor terminating resistors are required. Power can be supplied either over the bus
cable or from a local power supply.

MP

4321 VRP-M

MPw

~

T

+

_

5 6 7

U5 z1 z2

4321 VRP-M

MPw

~

T

+

_

5 6 7

U5 z1 z2

~

T

+

_

AC 24

V

DC 24

V

Network

Up to eight MP actuators can be connected in a network (VAV-Compact, VRP-M etc.).

Supply with AC or DC voltage

Nominal voltage AC 24 V, 50/60 Hz DC 24 V
Power supply range AC 19.2...28.8 V DC 21.6...26.4 V
Wire sizing See «Technical data», page 7

Length of MP-Bus cable

The cable lengths are limited:
– By the sum of the performance data of the connected devices, VAV controllers and actuators
– By the type of supply (AC 24 V or DC 24 V)
– By the cable cross-section

For more information about planning and installation, see www.belimo.com

– VAV-Compact NMV-D2-MP Product Information
– Bus and communication systems section

Addressing

If the VRP-M system solution is integrated in a bus system, each connected VRP-M must be
assigned an MP address in the range 1 ... 8.

Procedure

– Start the addressing procedure on the MP-Bus master with the VRP-M-Tool, UK24LON, etc.
– Refer to the bus master documentation for further details
– Procedure with VRP-M-Tool:
a) Select the address by means of the serial number
Enter the serial number of the VRP-M (sticker on VRP-M, displayed in VRP-M-Tool)
b) Select addressing with acknowledgement on the VRP-M
Acknowledge the selected address by pressing the Set pushbutton on the required VRP-M
The power LED (green) blinks when the Set pushbutton is pressed

Up to 8 MP-Bus users

More MP-Bus users

Technical data sheet VFP-.. sensors

www.belimo.eu Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes 19 / 28

Static differential pressures sensor
for neutral to slightly aggressive gases

VFP-100

VFP-300
VFP-600

Technical data

Electrical data

Power supply
Connection

DC 15 V (from VRP-M controller)
1 m cable with 4-pin plug
(compatible with VRP-M controller)

Functional data

Measuring range See «Overview of types»
Overload protection See «Overview of types»
Measuring principle Diaphragm differential pressure measurement

(inductive)
Medium Neutral to slightly aggressive gases
Parts in contact with medium Ni, Al, CuBe, PU
Linearity ±1% of final value (FS)
Hysteresis Max. 0.1% of final value
Temperature sensitivity Zero

Measuring range

See «Overview of types»

t = +10 ... 40°C (reference temperature t0 = 25°C)
Mounting position Upright (connection on bottom or side)
Position dependency Max. ±4.5 Pa

when rotated 90° about horizontal axis
Pressure port Hose connection

for hose with 4 ... 6 mm internal diameter

Safety

Protection class III Safety extra-low voltage
Degree of protection IP42
EMC CE according to 89/336/EEC
Mode of operation Type 1 (to EN 60730-1)
Ambient temperature range 0 ... +50°C
Non-operating temperature –10 ... +70°C
Ambient humidity range 5 ... 95% r.H., non-condensating (EN 60730-1)
Maintenance Maintenance-free

Dimensions/weight

Dimensions See «Dimensions» on page 25
Weight See «Overview of types»

Overview of types

Type Measuring ranges Overload protection

Temperature sensitivity

of zero

Weight

VFP-100 0 ... 100 Pa max. 500 Pa

±0.1% / K Approx. 500 g
VFP-300 0 ... 300 Pa max. 5’000 Pa ±0.05% / K Approx. 280 g
VFP-600 0 ... 600 Pa max. 3’000 Pa ±0.05% / K Approx. 280 g

Safety notes

!

• The sensors are not allowed to be used outside the specified field of application, especially in

aircraft or in any other airborne means of transport.

• They may only be installed by suitably trained personnel.

All applicable legal or institutional installation regulations must be complied with.

• The devices do not contain any parts that can be replaced or repaired by the user.

• The devices contain electrical and electronic components and are not allowed to be disposed

of as household refuse. All locally valid regulations and requirements must be observed.

VFP-..

Static differential pressure sensors

20 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu

Product features

Application

Together with a VRP-M controller and a Belimo NM..-ST actuator, the VFP-.. static pressure
sensors form a control system for pressure-independent variable (VAV) and constant (CAV) air
volume controls.
The pressure sensors are used for static differential pressure measurement with differential
pressure pickups installed in air ducts. They are also suitable for contaminated or slightly ag­gressive air 1). Their robust design makes them ideal for installation in laboratories, clean room
systems and industrial applications.

Mode of operation

A high-quality metal diaphragm is used in the sensor. The measured pressure produces a corre­sponding diaphragm stroke, which is detected inductively and converted to a pressure-linearised
output signal.
The measuring signal is influenced by the mounting position due to the dead weight of the dia­phragm. The sensor is calibrated at the factory in the vertical position, but can be readjusted on
site if necessary, e.g. in order to mount it in another position.
The temperature is compensated to reduce drift to a minimum. The wear-free, inductive measu­rement method guarantees maintenance-free operation.

1) See «Technical data», page 19
For zero offset and more information, see «System description», page 6

Electrical installation

The ready-to-connect sensor unit is connected to the VRP-M controller with the 4-pin plug.

Technical data sheet NMQB24-SRV-ST actuator

www.belimo.eu Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes 21 / 28

Fast-running damper actuator
for VRP-M system solution

Technical data

Electrical data

Power supply AC/DC 24 V (from VRP-M controller)
Power consumption In operation

At rest
For wire sizing
Connection

9 W
<1.2 W
12 VA (lmax. 8.3 A @ 5 ms)
Cable with 6-pin plug
(compatible with VRP-M controller)

Functional data

Torque (nominal torque) Min. 4 Nm @ nominal voltage
Direction of rotation Reversible with switch or
Angle of rotation

Max. 95° , mechanical end stops adjustable
Permissible range of rotation 63 ... 95%
Running time 5 s
Sound power level 52 dB (A)

Safety

Protection class III Safety extra-low voltage
Degree of protection IP54 (cable entry at bottom)
EMC CE according to 89/336/EEC
Mode of operation Type 1 (to EN 60730-1)
Ambient temperature range –30 ... +50°C
Non-operating temperature –40 ... +80°C
Ambient humidity range 5 ... 95% r.H., non-condensating (EN 60730-1)
Maintenance Maintenance-free

Dimensions/weight

Dimensions See «Dimensions» on page 25
Weight Approx. 900 g

Safety notes

!

• The actuator is not allowed to be used outside the specified field of application, especially in

aircraft or in any other airborne means of transport.

• It may only be installed by suitably trained personnel.

All applicable legal or institutional installation regulations must be complied with.

• The device does not contain any parts that can be replaced or repaired by the user.

• The actuator is synchronised when the supply voltage is switched on or when the manual

override switch is actuated. The actuator or the damper blade is moved into the «CLOSED»
position in a defined manner and then into the position dictated by the system.

• The device contains electrical and electronic components and is not allowed to be disposed

of as household refuse. All locally valid regulations and requirements must be observed.

NMQB24-SRV-ST

Fast-running damper actuator for VAV and CAV units

22 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu

Product features

Simple direct mounting

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

Manual control

Manual operation with self-resetting pushbutton.
The position calculation is synchronised in order to prevent deviations as a result of manual
control. This synchronisation also permits a simple functional check (see «Synchronisation»
below).

Adjustable angle of rotation

Caution!

Adaptation is necessary when the system is
commissioned or whenever the end stops for angle
of rotation limiting are adjusted (press the push­button twice).

!

The angle of rotation is adapted to the available setting range by the manufacturer of the damper by
means of integrated, mechanical end stops.
Permissible range: 63 ... 100%.

Adaptation to the available angle of rotation

This function detects the upper and lower spindle end stops and stores them in the actuator. The
running time and the working range are adapted to the available angle of rotation. Detection of
the mechanical end stops enables a gentle approach to the end position and protects the actua­tor and damper mechanisms.

Synchronisation

The actuator moves into the «CLOSED» position (left or right end stop, depending on the posi­tion of the direction of rotation switch) when the supply voltage is switched on, in the event of a
power failure >5 s or if the pushbutton is actuated again. It then moves into the position required
by the system.

Functional check

Correct functioning of the dampers can be checked extremely easily: The gearing latch can be
disengaged simply by pressing a pushbutton on the housing. As long as the pushbutton remains
pressed, the damper can be operated manually.

High functional reliability

The actuators are overload-proof, require no limit switches and automatically stop when the end
stop is reached.

Electrical installation

The ready-to-connect actuator unit is connected to the VRP-M controller with the 6-pin plug.

Technical data sheet NM24A-V-ST actuator

www.belimo.eu Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes 23 / 28

Damper actuator
for VRP-M system solution

Technical data

Electrical data

Nominal voltage AC 24 V, 50/60 Hz / DC 24 V

(from VR.. controller)

Power consumption In operation
At rest
For wire sizing

3.5 W @ nominal torque

1.25 W

5.5 VA

Connection 0.5 m cable with 6-pin plug

(compatible with VRP-M)

Functional data

Torque (nominal torque) Min. 10 Nm @ nominal voltage
Uni-rotation ±5%
Direction of rotation Can be selected with 0 / 1 switch
Direction of motion at Y = 2 V In switch position 0 or 1
Manual override Disengaging the gearing latch by means

of a pushbutton, self-resetting

Angle of rotation

Max. 95° , can be limited at both ends

with adjustable mechanical end stops
Running time 150 s
Sound power level Max. 35 dB (A)
Position indication Mechanical, plug-on
Adaptation Adaptation of the control range

to the damper angle of rotation
Display LED display for 24 V supply and states

Safety

Protection class III Safety extra-low voltage
Degree of protection IP54 in all mounting positions
EMC CE according to 89/336/EEC
Mode of operation Type 1 (in acc. with EN 60730-1)
Rated impulse voltage 0.8 kV (in acc. with EN 60730-1)
Control pollution degree 3 (in acc. with EN 60730-1)
Ambient temperature range –30 ... +50°C
Non-operating temperature range –40 ... +80°C
Ambient humidity range 95% RH, non-condensating (EN 60730-1)
Maintenance Maintenance-free

Dimensions/weight

Dimensions See «Dimensions» on page 25
Weight Approx. 710 g

Safety notes

!

• The damper actuator is not allowed to be used outside the specified field of application,

especially in aircraft or in any other airborne means of transport.

• It may only be installed by suitably trained personnel.

All applicable legal or institutional installation regulations must be complied with.

• The device may only be opened at the manufacturer‘s site. It does not contain any parts that

can be replaced or repaired by the user.

• The cable is not allowed to be removed from the unit.

• When the required torque is calculated, the cross section, design and installation site as

well as the air flow conditions must be observed.

NM24A-V-ST

Ready-to-connect operating unit

24 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu

Accessories

Description Data sheet

Electrical accessories

Auxiliary switch S..A.. T2 - S..A..
Feedback potentiometer P..A.. T2 - P..A..

Mechanical accessories

Spindle extension AV6-20 T2 - Z-NM..A..

Product features

Mode of operation

The actuator is controlled with a Belimo VRP-M controller and travels to the position
defined by the control signal.

Simple direct mounting

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

Manual override

Manual override with self-resetting pushbutton possible (the gear is disengaged for as long as
the button is pressed).

Adjustable angle of rotation

Adjustable angle of rotation with mechanical end stops.

Adaptation

Angle-of-rotation sensing and adaptation of the control range. Triggered by pressing a button on
the actuator, with LEDs for status display.

High functional reliability

The actuator is overload-proof, requires no limit switches and automatically stops when the end
stop is reached.

Electrical installation

The ready-to-connect operating unit is connected to the VRP-M-controller.

Safety notes

(continued)

• The device contains electrical and electronic components and is not allowed to be disposed
of as household refuse. The local and currently valid regulations and requirements must be
observed.

Dimensions

www.belimo.eu Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes 25 / 28

Dimensional drawings

VRP-M controller

Dimensional drawings

VFP-100 sensor

Dimensional drawings

VFP-300 and VFP-600 sensors

Dimensional drawings

NMQB24-SRV-ST actuators

Dimensional drawings

NM24A-V-ST actuators

5

54

4.5

130

140

153

4543

88

5

58

12015

150

13

5

40

80

ø 4.5

49

66

12

90

81

25.5

51

139

22

36.5

58

10

105.6

6.9

26.5

5.2

81

25 121 41

80

124

49

62

Damper spindle Length
Clamp, top min. 40 8 ... 26,7
Clamp, bottom * min. 20 8 ... 20
* Option (accessorie K-NA)

Damper spindle length
min. 38 8 ... 20

Notes

26 / 28

Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes

www.belimo.eu

All inclusive.

Belimo worldwide: www.belimo.com

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