FläktGroup 327VMZ-BN is a volumetric flow control device that is used to regulate the airflow of indoor ventilation systems. It features an integrated airflow measurement device which enables precise control of volume flow rates. The device is intended for use in CAV and VAV systems.
Some of the key capabilities and possible use cases of FläktGroup 327VMZ-BN include:
- Precise control of volume flow rates
- Suitable for use in CAV and VAV systems
- Easy installation and commissioning
- Compatible with Modbus RTU and BACnet MS/TP communication protocols
- Can be used for demand-controlled ventilation applications
FläktGroup 327VMZ-BN is a volumetric flow control device that is used to regulate the airflow of indoor ventilation systems. It features an integrated airflow measurement device which enables precise control of volume flow rates. The device is intended for use in CAV and VAV systems.
Some of the key capabilities and possible use cases of FläktGroup 327VMZ-BN include:
- Precise control of volume flow rates
- Suitable for use in CAV and VAV systems
- Easy installation and commissioning
- Compatible with Modbus RTU and BACnet MS/TP communication protocols
- Can be used for demand-controlled ventilation applications
USER MANUAL
Volumetric flow control device
327VMZ
FläktGroup DC_10605GB 20221117_R0 Specifications are subject to alteration without notice.
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Volumetric flow control device 327VMZ - User Manual
TABLE OF CONTENTS
Table of contents ..........................................................................................................................................................................................................................2
1 Preface ....................................................................................................................................................................................................................................3
1.1 Description of the user ............................................................................................................................................................................................................3
1.2 Conventions Used in this Manual ........................................................................................................................................................................................ 3
1.3 Explanation of Safety Warnings ...........................................................................................................................................................................................3
1.4 Retaining instructions ...............................................................................................................................................................................................................3
1.5 Obtaining Documentation and Information ...................................................................................................................................................................... 3
2 Description of the Product ..................................................................................................................................................................................................3
2.1 Intended Use and Reasonably Foreseeable Misuse ..................................................................................................................................................3
2.2 Device Overview .........................................................................................................................................................................................................................3
2.3 Technical Data ............................................................................................................................................................................................................................. 4
2.4 Products to which user manual applies ..........................................................................................................................................................................4
3 Safety Instructions ...............................................................................................................................................................................................................4
3.1 How to Use the Product Safely ............................................................................................................................................................................................4
4 Installation ..............................................................................................................................................................................................................................5
4.1 Connecting the device ..............................................................................................................................................................................................................5
4.1.1 Wiring .................................................................................................................................................................................................................................. 5
4.1.2 Application examples ...................................................................................................................................................................................................6
4.1.3 Forced controls ............................................................................................................................................................................................................... 7
5 Use ...........................................................................................................................................................................................................................................8
5.1 User interface ..............................................................................................................................................................................................................................8
5.2 Sensor LED indications ............................................................................................................................................................................................................ 8
5.3 Navigation ...................................................................................................................................................................................................................................... 8
5.4 Menu structure & setting parameters ...............................................................................................................................................................................9
5.5 Analog signals ............................................................................................................................................................................................................................. 11
5.5.1 Analog input signal Y ....................................................................................................................................................................................................11
5.5.2 Analog output signal U ................................................................................................................................................................................................. 11
5.6 Communication parameters .................................................................................................................................................................................................. 12
5.6.1 Modbus RTU .....................................................................................................................................................................................................................12
5.6.2 BACnet MS/TP ................................................................................................................................................................................................................. 12
5.7 OPTIVENT
®
ULTRA initialization calibration ...................................................................................................................................................................... 12
5.8 OPTIVENT
®
ULTRA automatic calibration .........................................................................................................................................................................12
6 Maintenance ..........................................................................................................................................................................................................................12
6.1 How to maintenance ................................................................................................................................................................................................................12
7 Troubleshooting ....................................................................................................................................................................................................................13
7.1 Status messages ....................................................................................................................................................................................................................... 13
7.2 Error indications .........................................................................................................................................................................................................................13
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Volumetric flow control device 327VMZ - User Manual
PREFACE, DESCRIPTION OF THE PRODUCT
1 PREFACE
1.1 DESCRIPTION OF THE USER
Skilled qualified electrician is a person who has received instruction in
electrical and operational work corresponding to his or her training and
work experience and is considered to have adequate professional skills
for supervising and performing such work.
1.2 CONVENTIONS USED IN THIS MANUAL
CAV Constant Airflow Volume
VAV Variable Airflow Volume
EMSF Airflow measurement device
RTU Remote terminal unit
MS/TP Master-Slave/Token-Passing datalink protocol
1.3 EXPLANATION OF SAFETY WARNINGS
WARNING Warning indicates a hazard with a medium level of risk
which, if not avoided, could result in death or serious injury.
CAUTION Caution indicates a hazard with a low level of risk which, if
not avoided, could result in minor or moderate injury.
NOTICE Notice indicates information considered important, but not
hazard-related.
Risk of electric shock. Can cause injury or death.
1.4 RETAINING INSTRUCTIONS
IMPORTANT
READ CAREFULLY BEFORE USE
KEEP FOR FUTURE REFERENCE
1.5 OBTAINING DOCUMENTATION AND INFORMATION
This document is provided only in digital format and will be available
from FläktGroup’s website.
Additional documents and more information about the product can be
found from FläktGroup websites www.flaktgroup.com.
2 DESCRIPTION OF THE PRODUCT
2.1 INTENDED USE AND REASONABLY FORESEEABLE MISUSE
OPTIVENT
®
ULTRA is intended for regulating the air volume flow of in-
door ventilation systems to precisely control clean indoor air.
OPTIVENT
®
ULTRA shall not be used in potentially explosive environ-
ments or in applications containing excessively polluted indoor air such
as extract air in professional cooking facilities.
OPTIVENT
®
ULTRA may only be used according to the instructions as
described in this manual together with OPTIVENT
®
ULTRA VAV damper
technical datasheet. All use, other than that described in this manual, is
seen as unintended use. Modifications to this manual in the course of
technological progress is reserved.
The installation and electric connection task described in this manual
can be done only by a skilled qualified electrician.
2.2 DEVICE OVERVIEW
OPTIVENT
®
ULTRA is a complete VAV unit consisting of a bus-controlled
actuator with ultrasound-based measuring sensor intended for pres-
sure-independent air volume control. Operation of OPTIVENT
®
ULTRA
can be monitored directly through the user interface of the actuator and
it can be used for setting the desired parameters.
LED button (A)
LED off - no power supply
LED on - actuator is on po-
sition
LED blinks - actuator drives
on position but hasn’t
reached its setpoint
Service connector (B)
The service connector
serves in combination with GUIV, for updat-
ing controller firmware and parameteriza-
tion and diagnostic of the controller values.
Value selector (C)
The value selector serves for setting single
values that are shown in the display.
Display (D)
The backlighted display serves for setting different values directly on
the actuator without additional setting tools.
The unit matrix can be read out on the actuator label and active unit se-
lection can be checked from the display.
Example 1:
The actuator display is showing 1 000 l/s flow.
Example 2:
The actuator display is showing 1 000 m
3
/h flow.
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Volumetric flow control device 327VMZ - User Manual
DESCRIPTION OF THE PRODUCT, SAFETY INSTRUCTIONS
2.3 TECHNICAL DATA
Electrical data
Nominal voltage 24V AC/DC (±20%)
Nominal voltage range 19-29 V
Nominal voltage frequency with AC 50/60Hz
Power consumption in operation 5 Nm : < 2.0 W
10 Nm : < 3.0W
Power consumption for cable sizing 5 Nm : 4 VA
10 Nm : 5.5 VA
Analog input 0(2)...10VDC / 0(4)...20mA with 500Ω
resistor
Analog input impedance > 50 kΩ
Analog output 0(2)...10VDC / max. 5 mA
Connection cross-section
4 x 0.75 mm
2
, (power supply & analog
signals)
2 x 0.38 mm
2
, (RS-485)
Method of connection Flying lead 1000 mm
Running time 5 Nm : 100 s / 90°
10 Nm : 150 s / 90°
Safety
Protection class IEC/EN Class III (Safety extra-low voltage)
EMC CE according to 2014/30/EU
Low voltage directive CE according to 2014/35/EU
Certification IEC/EN IEC/EN 60730-1
RoHS CE (2011/65/EU – 2015/863/EU –
2017/2101/EU)
Mode of operation Type 1
Degree of protection IEC/EN IP20
Rated impulse voltage 0.5 kV
Control pollution degree 3
Ambient temperature normal oper-
ation +5..+50°C
Transportation and storage temper-
ature -20..+80°C
Ambient humidity 5..95% R.H., non-condensing
Maintenance Maintenance-free
2.4 PRODUCTS TO WHICH USER MANUAL APPLIES
MODBUS actuators BACnet actuators
327VMZ-024-05-MB-002
327VMZ-024-10-MB-002
327VMZ-024-05-BN-002
327VMZ-024-10-BN-002
3 SAFETY INSTRUCTIONS
3.1 HOW TO USE THE PRODUCT SAFELY
• OPTIVENT
®
ULTRA may only be installed by suitably trained person-
nel. Any legal regulations or regulations issued by authorities must
be observed during assembly.
• Use only safety isolating transformer to supply OPTIVENT
®
ULTRA.
• Do not try to open the actuator housing.
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Volumetric flow control device 327VMZ - User Manual
INSTALLATION
4 INSTALLATION
4.1 CONNECTING THE DEVICE
FläktGroup recommends using a dedicated 24 VAC transformer for supplying exclusively OPTIVENT
®
ULTRA control units to avoid any device damages
or power supply failures if mixed with other vendor devices. Provide overload protection for line voltage and disconnect as required.
Where multiple OPTIVENT
®
ULTRA control units are supplied from a common power supply, all common and signal (–) must be connected in line. Mix-
ing polarities can cause controller damage or operation error. Consider voltage drops when connecting multiple actuators in parallel.
4.1.1 Wiring
Actuators are provided with colour coded and numbered cables.
No. Designation Colour Function
1⊥ / - black Power supply 24VAC/DC
2~ / + red
3 Y white Setpoint signal 0-10 VDC
4 U orange Feedback signal 0-10 VDC
ACA - pink Communication (RS-485)
BCB + grey
Communication line is wired according to 2-wire RS-485 rules. There can be up to 128 devices on one bus (Modbus load 1/4.) The wiring should be done
using a twisted pair cable, such as NOMAK-HF Dca 2x2x0,5+0,5 or JAMAK-HF Dca 2x(2+1)x0,5.
The signal grounds of all devices on the same bus should be connected in series. The bus should form a daisy chain with the cable running from one
device to the next without branches (max. branch length 10m). The maximum bus length is 800 m. The bus should be terminated at both ends using
120 Ω resistors.
1 2 3 4 A B
CA CBU~
+-- +
Y
BK RD WH OG PK GY
230 V
24 V AC/DC
A B G G0 A B G G0 A B G G0 A B G G0
RS485 A
RS485 B
RS485 Common
Actuator Actuator Actuator Actuator
The bus cable should be connected to wires A and B in the same way at every device on the bus. The terminating resistors at both ends of the bus
should be connected between wires A and B. If necessary, to eliminate interference the shield of the twisted pair cable can be connected to protective
ground. The connection should be made only at one end of the shield, for example always to the cable coming from the controller.
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Volumetric flow control device 327VMZ - User Manual
INSTALLATION
4.1.2 Application examples
Parallel control
Parallel control can be used when two or more OPTIVENT
®
ULTRA control units are controlled with a single analog signal. Maximum of 20 units can be
controlled in a series with a single 0(2)…10 VDC analog signal and maximum of 10 units can be controlled in a series if (0)4…20 mA analog signal with
500Ω resistor is used instead.
EMSF control
Air volume flow measurement device output (FläktGroup EMSF) can be used to control OPTIVENT
®
ULTRA control unit air volume flow.
NOTICE
Analog control modes must be set equally in both devices e.g. 0…10 VDC OR 2…10 VDC and airflow volume flow measurement device maximum flow must be
set equally to OPTIVENT® ULTRA control unit maximum air volume flow. OPTIVENT® ULTRA control unit minimum air volume flow must be set to 0.
+
-
24 V AC/DC
Bus control
~
1 2
BNBU
∆pM
GY
0-10 V
2-10 V
0-10 V
2-10 V
GT-MB
EMSF UL(S,D)A
327VMZ
4 A
WH WH
B A B1 2 3 4
Vmax S (GT) = Max (327VMZ) Min (327VMZ) = 0
WHBK RD OG PK GY
0...10/2...10 V DC
Bus control
24 V AC/DC
MM
A B1 2 3 4
WHBK RD OG PK GY
A B1 2 3 4
WHBK RD OG PK GY
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Volumetric flow control device 327VMZ - User Manual
INSTALLATION
CAV constant air volume
Constant air volume flow control can be used to keep air flow rate constant without the need for external control signal.
Bus control
24 V AC/DC
M
A B1 2 3 4
WHBK RD OG PK GY
Max = 0
Min = Setpoint
4.1.3 Forced controls
Forced controls are the type of controls which can be applied through analog input and which will perform pre-defined function in the actuator. The
principle of defining applicable forced control is to distinguish different variations of 24VAC waveform or 24VDC potentials which are applied to actuator
analog input by using e.g. change-over contact. Each different waveform variation or pre-defined potential level have explicit function in the actuator.
NOTICE
For forced controls to take place the setpoint source for the actuator must be set to analog input.
Setpoint source is set to analog by default.
Refer to MODBUS IMPLEMENTATION GUIDE or BACnet PICS for more information on how to change setpoint source if necessary.
24 VAC Forced control
Waveform / Signal Min Max Btw Open Close
Open circuit X
Ground X*
Full wave X
Pos. half wave X
Neg. half wave X
* Only if analog input is set to 2...10V or if Min. is set to 0 with 0...10V.
24 VDC Forced control
Waveform / Signal Min Max Btw Open Close
Open circuit X
0VDC X*
24VDC X
* Only if analog input is set to 2...10V or if Min. is set to 0 with 0...10V.
1 2 3 4
Y U
U
~
Close
Min
Max
Open
Btw
~
AC 24 V
DC 24 V +
1N4007
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Volumetric flow control device 327VMZ - User Manual
USE
5 USE
5.1 USER INTERFACE
OPTIVENT
®
ULTRA control unit user interface consists of:
LED push button (A)
Service connector (B)
Value selector (C)
Three-digit seven-segment
display with backlight (D)
Additional signs on the display
include a small circle, three square
dots, two rectangular slashes and
a decimal point. The three square dots
are used with externally printed text to
visualize unit of measurement. It is
meant to denote the unit of volume for
volume related values shown in the
display.
Numbers on a round background on the bottom of the display indicates
currently active menu item. The default menu item shown in the display
is ❶ Act. / Set.
The rectangular slashes are used to define the thousand separators
and the top square dot on the upper right corner is used to define the
unit of the volume flow.
Example 1:
Indication of a value 4´350 l/s.
Example 2:
Indication of a value 10´000 m
3
/h.
Example 3:
Indication of a value 521 m
3
/h.
The small circle at the first digit is used for indicating that the measured
volume flow is above the nominal flow defined for the OPTIVENT
®
ULTRA
product.
Example 4:
Indication of a value 10´000 l/s
which is above the defined nominal
value for the product.
The actual and the setpoint air volume flow values alternate on the dis-
play in one second intervals if control loop has not reached the setpoint
and no forced control exist in normal operation.
Once control loop has reached the setpoint, only the actual air volume
flow value is constantly displayed and the LED light on LED push button
is on continuously.
In case the forced control is active, the actual air volume flow value and
the abbreviation of appropriate forced control function alternate on the
display in one second intervals.
5.2 SENSOR LED INDICATIONS
Air speed Slowly blinking Constantly lit
< 0.5 m/s
0.5 m/s - 3 m/s
3 m/s - 6 m/s
6 m/s - 9 m/s
9 m/s - 12 m/s
12 m/s - 15 m/s
> 15 m/s
5.3 NAVIGATION
The LED push button is used for toggling between menu items ❶…❽
and for accessing to sub-menu items.
By pressing the LED push button less than 2 seconds menu item is
changed.
By holding the LED push button down for over 2 seconds enables the
user to modify selected value with the value selector or access to the
sub-menu of selected menu item.
The backlight of the display is switched on after the first touch of the
LED push button. The display will return to the default menu item and
the backlight will switch off after 60s of inactivity.
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Volumetric flow control device 327VMZ - User Manual
USE
5.4 MENU STRUCTURE & SETTING PARAMETERS
Number Designation Description Default value
❶
Act. Actual measured flow or forced control shown when the LED light on LED push button lights up.
Set. Volume flow setpoint shown when the LED light on LED push button is off.
By holding the LED push button down for over 2 seconds when the test menu item ❶ is selected the unit
of volume flow measurement can be changed using value selector. After selecting desired unit using value
selector push LED push button to active the selected unit. (Dot on right upper corner is visible for m3/h, and
not visible for l/s.)
l/s
❷Min. Adjustable minimum setpoint flow value for the analog or bus control. 0.0 x ❹
❸Btw. Adjustable between setpoint flow value for the analog or bus control. 0.5 x ❹
❹Max. Adjustable maximum flow setpoint value for the analog or bus control. q
nom
❺Test In the test menu the analog set point value Y and the feedback signal U are both displayed alternately in 1 second
intervals.
Example: Y = 7.4 V Example: U = 5.1 V
By holding the LED push button down for over 2 seconds when the test menu item ❺ is selected the following
sub-menu items of override functions will appear to the display. After selecting desired function using value selector
push LED push button to activate the function.
Return to the first menu level. No override function is
selected.
oP(en) Forces damper fully open
cL(ose) Forces damper fully closed
Hi(gh) Forces actuator to control the set maximum volume flow ❹
Lo(w) Forces actuator to control the set minimum volume flow ❷
bE(tween) Forces actuator to control the set between volume flow. ❸
St(op) Forces actuator to stop volume flow control
Shows the actual duct size e.g. size DN125 is shown as
d12
rST (Reset) Performs actuator reset with sensor zero-point calibra-
tion and actuator adaption drive
Shows actuator firmware version
NOTE: Override functions enabled from menu item ❺ are automatically reset after 10 hours or if in analog mode and
override function is enabled from bus.
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Volumetric flow control device 327VMZ - User Manual
USE
❻Mode 0-10V analog control, 0-10V feedback signal
Normal rotation direction (clockwise) x
2-10V analog control, 2-10V feedback signal
Normal rotation direction (clockwise)
Control via bus, 0-10V feedback signal
Normal rotation direction (clockwise)
Control via bus, 2-10V feedback signal
Normal rotation direction (clockwise)
❼
Adr.
(BACnet
instance) *
Bus address and communication parameter settings for bus communication.
When navigated to the menu item ❼ the device bus
address is shown. 1
①If the LED push button is held down for over 2 seconds the desired bus address can be selected
using the value selector.
②If the LED push button is pushed second time the communication parameter sub-menu will be en-
tered.
③Value selector can be used to toggle between the bus address and the communication parameter
menu items.
Example:
Bus address
Example:
Comm. parameter
④If communication parameter menu item is selected and the LED push button is held down for
over 2 seconds the desired bus parameter value can be selected using value selector.
Refer to Communication parameters for more information BACnet - bc3
Modbus - b14
⑤Desired selection is finally accepted by pushing the LED push button
❽Inst. Installation parameter for short safety distance installations. Refer to OPTIVENT
®
ULTRA - Installation, Commission-
ing, Maintenance manual for more information. 100
*) BACnet instance number equals BACnet MS/TP MAC address as long as BACnet instance is not changed through BACnet device property object.
Once BACnet instance number is changed through BACnet device property object changing BACnet MS/TP MAC address does not change BACnet in-
stance number any longer.
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Volumetric flow control device 327VMZ - User Manual
USE
5.5 ANALOG SIGNALS
5.5.1 Analog input signal Y
The analog input signal Y allows to control the VAV actuator according
to the selected mode of operation.
NOTICE
For analog control to take place the setpoint source for the actuator must
be set to analog input.
Setpoint source is set to analog by default.
Refer to MODBUS IMPLEMENTATION GUIDE or BACnet PICS for more
information on how to change setpoint source if necessary.
In mode 0…10 VDC the analog input signal Y matches to the following
air volume flows:
Vact = Vmin + x (Vmax - Vmin)
and the air volume flows match to the analog input signal Y:
Y = 0 V
DC
= Vmin
Y = 10 V
DC
= Vmax
Y = 10 V
DC
x
In mode 2…10 VDC the input signal Y matches to the following air vol-
ume flows:
Vact = Vmin + x (Vmax - Vmin)
and the air volume flows match to the analog input signal Y:
Y = 2 V
DC
= Vmin
Y = 10 V
DC
= Vmax
Y = 2 V
DC
+ 8 V
DC
x
NOTICE
Mode 2…10 VDC includes special feature to close damper with input signal
Y = 0 VDC. For more information refer to section 4.1.3 Forced controls.
Y
10 V
DC
______
Vact - Vmin
Vmax - Vmin
__________
Y-2 V
DC
8 V
DC
_________
Vact - Vmin
Vmax - Vmin
__________
Vmin (Device) is a unit size dependent fixed minimum air volume flow
control value. Vmin (Device) air volume flow value is defined by 0.02
x Vnom. All the setpoint values below Vmin (Device) values are out-
side the unit control range and will result for a complete closing of the
damper. In addition, Modbus status register 105 bit 6 (seepage flow)
goes high.
5.5.2 Analog output signal U
Output signal U follows the selected mode of operation and shows the
actual flow V
act
normalized to the selected V
nom
value.
In mode 0…10 VDC the output signal U matches to the following air vol-
ume flows:
U = 10 V
DC
x
where V
nom
is size dependent nominal air volume flow and to calculate
the actual flow V
act
from the feedback signal U:
Vact = Vnom x
In mode 2…10 VDC the output signal U matches to the following air vol-
ume flows:
U = 2 V
DC
+ 8 V
DC
x
and to calculate the actual flow Vact from the feedback signal U:
Vact = Vnom x
Characteristic of feedback signal U in both input modes
Vact
Vnom
_____
Vact
Vnom
_____
U
10 V
DC
_______
__________
U - 2 V
DC
8 V
DC
VNom
.
Air volume flow
10 VDC
2
0
Vmin
.
(Device)
(100%)
Control range
10
U
8
U – 2
Vact = VNom
. .
Vact = VNom
. .
Actual air volume flow U
Mode 0 ... 10 VDC
Mode 2 ... 10 VDC
Air volume flow
VNom
Reference signal Y 10VDC
(Device)
2
0
0
.
.
Vref = (Vmax – Vmin) + Vmin
Y – 2
8
. . . .
Vref = (Vmax – Vmin) + Vmin
Y
10
. . . .
Vmax
.
Vmin
.
Vmin
.
Mode 0 ... 10 VDC
Mode 2 ... 10 VDC
Vnom is a unit size dependent fixed nominal air volume flow value for
a specific unit. Vnom is the absolute maximum control limit value for
Vmin, Vbtw, and Vmax air volume flow values.
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Volumetric flow control device 327VMZ - User Manual
USE, MAINTENANCE
5.6 COMMUNICATION PARAMETERS
5.6.1 Modbus RTU
Parameter Baudrate Parity Stop bits
b1 1200 None 2
b2 1200 Even 1
b3 1200 Odd 1
b4 2400 None 2
b5 2400 Even 1
b6 2400 Odd 1
b7 4800 None 2
b8 4800 Even 1
b9 4800 Odd 1
b10 9600 None 2
b11 9600 Even 1
b12 9600 Odd 1
b13 19200 None 2
b14
1)
19200 Even 1
b15 19200 Odd 1
b16 38400 None 2
b17 38400 Even 1
b18 38400 Odd 1
b19
2)
1200 None 1
b20
2)
2400 None 1
b21
2)
4800 None 1
b22
2)
9600 None 1
b23
2)
19200 None 1
b24
2)
38400 None 1
b25
2)
76800 None 1
b26
2)
115200 None 1
b27 76800 None 2
b28 76800 Even 1
b29 76800 Odd 1
b30 115200 None 2
b31 115200 Even 1
b32 115200 Odd 1
1)
default Modbus communication parameter
2)
not according Modbus specification
5.6.2 BACnet MS/TP
Parameter Baudrate
bc1 9600
bc2 19200
bc3
1)
38400
bc4 57600
bc5 76800
bc6 115200
1)
default BACnet communication parameter
5.7 OPTIVENT
®
ULTRA INITIALIZATION CALIBRATION
The OPTIVENT
®
ULTRA air volume measurement automatically cali-
brates itself to improve measurement accuracy and long-term stability.
Calibration is performed every time the OPTIVENT
®
ULTRA control unit
is powered up and it takes a maximum of two minutes after which the
controller continues normal air volume flow control.
During calibration process damper closes and the sensor initiates its
zero-flow reference value by measuring the flow for 30 seconds damp-
er closed.
5.8 OPTIVENT
®
ULTRA AUTOMATIC CALIBRATION
NOTICE
The automatic calibration functionality can only be enabled from Modbus
controllers. BACnet controllers do not support enabling the automatic
calibration functionality.
Refer to MODBUS IMPLEMENTATION GUIDE for more information on how to
enable automatic calibration functionality.
The automatic calibration functionality executes zero-flow calibration
when the air temperature changes. The first five calibrations are per-
formed when the temperature has changed by more than 1 °C from the
temperature of the previous calibration. The calibration is thereafter
performed when the temperature changes over 2 °C. The calibration
values are used to form an adaptive temperature compensation which
improves measurement accuracy.
Automatic calibration is disabled in all the actuator types by default.
6 MAINTENANCE
6.1 HOW TO MAINTENANCE
OPTIVENT
®
ULTRA control unit is maintenance free. Control unit can be
cleaned with a damp cloth if necessary.
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Volumetric flow control device 327VMZ - User Manual
TROUBLESHOOTING
7 TROUBLESHOOTING
NOTICE
Status messages and error indications on the actuator display are only shown
if default menu item ❶ Act. / Set. is selected.
7.1 STATUS MESSAGES
The actuator and the sensor are self-monitoring their individual status. In normal operation only green LED’s light up in the sensor and no error mes-
sages are shown on the actuator display.
The following status messages are normal indications of the functions performed by the actuator during normal operation and should not be confused
with fault indications.
Display Function Description
Adp Adaptation The actuator is performing an adaptation drive to adapt available travelling range
cAL Zero calibration The actuator is performing a zero-point calibration for the sensor
rEF Reference drive The actuator is performing a reference drive
Pc Service port Service connector is attached to the service port
7.2 ERROR INDICATIONS
In the event of malfunction one of the following error messages will be shown on the actuator display. During fault condition it is possible to manually
control actuator from fail safe position to fully open or fully closed by using override controls from menu item ❺ Test or through bus. In case of under
voltage the actuator retains its existing control.
Display Priority Description Action Fail safe position
Lou -Under voltage detected (Vcc ≤ 17 V AC/DC) Check power supply voltage and ensure it is within supply
voltage tolerances -
cE 1Cable to the sensor not connected Check cable connection and visible damages. Contact
FläktGroup technical support 50% open
cEr 2Communication problem between actuator and sensor Check cable connection and visible damages. Contact
FläktGroup technical support 50% open
Er 3Fatal error Either the actuator or the complete product needs to be
replaced 50% open
Ser 4Duct size unknown Contact FläktGroup technical support 50% open
FCE 5Factory calibration missing Contact FläktGroup technical support 50% open
0CE 6Zero-point calibration missing or failed Contact FläktGroup technical support 50% open
In sensor related malfunctions LED indicators on the sensor are used to distinguish different kinds of malfunctions. In OPTIVENT
®
ULTRA ULDA models
the sensor is installed inside the product and LED indicators cannot be seen.
Slowly blinking Constantly lit
Zero calibration failed
No zero calibration after a reset
Factory calibration missing
Fatal error
Communication error with the actuator
WWW.FLAKTGROUP.COM 327VMZ 10605
»
Learn more on www.flaktgroup.com
or contact one of our oices
FG_DC_10605GB_327VMZ_OM_20221117_R0 © Copyright 2022 FläktGroup
FläktGroup is the European market leader for smart and energy eicient Indoor Air
and Critical Air solutions to support every application area. We oer our customers
innovative technologies, high quality and outstanding performance supported by
more than a century of accumulated industry experience. The widest product range
in the market, and strong market presence in 65 countries worldwide, guarantee
that we are always by your side, ready to deliver Excellence in Solutions.
PRODUCT FUNCTIONS BY FLÄKTGROUP
Air Treatment | Air Movement | Air Diusion | Air Distribution | Air Filtration
Air Management & ATD’s | Air Conditioning & Heating | Controls | Service
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FläktGroup 327VMZ-BN is a volumetric flow control device that is used to regulate the airflow of indoor ventilation systems. It features an integrated airflow measurement device which enables precise control of volume flow rates. The device is intended for use in CAV and VAV systems.
Some of the key capabilities and possible use cases of FläktGroup 327VMZ-BN include:
- Precise control of volume flow rates
- Suitable for use in CAV and VAV systems
- Easy installation and commissioning
- Compatible with Modbus RTU and BACnet MS/TP communication protocols
- Can be used for demand-controlled ventilation applications
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