USER MANUAL
Pressure controller
327VMZ-MB
FläktGroup DC_10751GB 20231124_R0 Specifications are subject to alteration without notice.
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Pressure controller 327VMZ-MB - 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
6 Maintenance ..........................................................................................................................................................................................................................12
6.1 How to maintenance ................................................................................................................................................................................................................12
7 Troubleshooting ....................................................................................................................................................................................................................13
7.1 Status messages ....................................................................................................................................................................................................................... 13
7.2 Error indications .........................................................................................................................................................................................................................13
8 Modbus interface ...................................................................................................................................................................................................................14
8.1 Technical data ..........................................................................................................................................................................................................................14
8.2 Default Modbus settings .......................................................................................................................................................................................................14
8.3 Modbus message frame ......................................................................................................................................................................................................14
8.4 Supported Modbus function codes ...................................................................................................................................................................................14
8.5 Data types ..................................................................................................................................................................................................................................14
8.6 CRC ............................................................................................................................................................................................................................................14
9 Modbus registers ...................................................................................................................................................................................................................15
9.1 Operation values ......................................................................................................................................................................................................................15
9.2 Service values ..........................................................................................................................................................................................................................16
9.3 Status register (Modbus register 105).............................................................................................................................................................................17
9.4 Modbus communication settings register (Modbus register 569) .......................................................................................................................18
9.5 Mode register (Modbus register 770) ..............................................................................................................................................................................19
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Pressure controller 327VMZ-MB - 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
RTU Remote terminal unit
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
FläktGroup’s 327VMZ-MB compact controller is intended for regulating
the static air pressure of indoor ventilation systems to precisely control
clean indoor air. The pressure controller shall not be used in potentially
explosive environments or in applications containing excessively pollut-
ed indoor air such as extract air in professional cooking facilities.
The pressure controller may only be used according to the instructions
as described in this manual together with pressure controller EMPA,
EMPD, ERPA damper technical datasheet. All use, other than that de-
scribed 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
The 327VMZ-MB compact controller is a complete unit comprising of an
actuator with Modbus communication, including a dynamic differential
pressure sensor for pressure-dependent control and a user interface
with a 3-digit display which makes it possible to monitor pressure and
set values without external equipment.
The controller operating range is set to a standard value of 0–10 V on
delivery. To change the operating range to 2–10 V, see EMPA/EMPD or
ERPA Installation, Commissioning and Maintenance manual for more
information.
The controller can also be force controlled via closing contacts (timer,
presence detector, etc.) to override the set Min. or Max air pressure. It
is also possible to use the controller independently without any external
control
LED button (A)
LED off - no power supply
LED on - pressure control
at set point
LED blinks - pressure
control not yet reached
set point
Service connector (B)
The service connector
serves in combination with GUIV, for
updating controller firmware and
parameterization 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.
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Pressure controller 327VMZ-MB - User Manual
DESCRIPTION OF THE PRODUCT, SAFETY INSTRUCTIONS
Example 1:
The actuator display is showing 100 Pa pressure.
3 SAFETY INSTRUCTIONS
3.1 HOW TO USE THE PRODUCT SAFELY
• The 327VMZ-MB compact controller may only be installed by suita-
bly trained personnel. Any legal regulations or regulations issued by
authorities must be observed during assembly.
• Use only safety isolating transformer to supply the 327VMZ-MB
compact controller.
• Do not try to open the actuator housing.
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
327VMZ-024-05-MB-003/C1/CCPC
327VMZ-024-10-MB-003/C1/CCPC
Example 2:
The actuator display is showing 100 inWC x 1000
-3
pressure.
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Pressure controller 327VMZ-MB - User Manual
INSTALLATION
4 INSTALLATION
4.1 CONNECTING THE DEVICE
FläktGroup recommends using a dedicated 24 VAC transformer for supplying exclusively 327VMZ-MB compact controllers to avoid any device damag-
es or power supply failures if mixed with other vendor devices. Provide overload protection for line voltage and disconnect as required.
Where multiple 327VMZ-MB compact controllers are supplied from a common power supply, all common and signal (–) must be connected in line.
Mixing 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 2 1 A B 2 1 A B 2 1 A B 2 1
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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Pressure controller 327VMZ-MB - User Manual
Constant pressure
Constant pressure control can be used to keep air pressure 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
INSTALLATION
4.1.2 Application examples
Parallel control
Parallel control can be used when two or more 327VMZ-MB compact controller 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.
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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Pressure controller 327VMZ-MB - User Manual
INSTALLATION
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 holding register 123 in Service registers table on page 16.
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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Pressure controller 327VMZ-MB - User Manual
USE
5 USE
5.1 USER INTERFACE
327VMZ-MB compact controller 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 pressure for
pressure 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 pressure.
Example 1:
Indication of a value 100 Pa.
Example 2:
Indication of a value
1000 inWC x 1000
-3
Example 3:
Indication of a value
1200 inWC x 1000
-3
.
The small circle at the first digit is used for indicating that the measured
pressure value is above the nominal pressure defined for the 327VMZ-
MB compact controller.
Example 4:
Indication of a measured value 400 Pa
which is above the defined nominal
value for the product.
The actual and the setpoint pressure values alternate on the display 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 pressure
value is constantly displayed and the LED light on LED push button is on
continuously.
In case the forced control is active, the actual pressure value and the
abbreviation of appropriate forced control function alternate on the dis-
play in one second intervals.
5.3 NAVIGATION
The LED push button is used for toggling between menu items ❶…❼
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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Pressure controller 327VMZ-MB - User Manual
USE
5.4 MENU STRUCTURE & SETTING PARAMETERS
Number Designation Description Default value
❶
Act. Actual measured pressure or forced control shown when the LED light on LED push button lights up.
Set. Pressure setpoint shown when the LED light on LED push button is off.
By holding the LED push button down for over 2 seconds when menu item ❶ is selected the unit of pres-
sure can be changed using value selector. After selecting desired unit using value selector push LED push
button to active the selected unit.
Pa
❷Min. Adjustable minimum set point pressure for the analog or bus control in selected unit. 0
❸Max. Adjustable maximum pressure set point value for the analog or bus control in selected unit. P
nom
❹Diag In the Diag 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 Diag menu item ❹ 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 pressure ❸
Lo(w) Forces actuator to control the set minimum pressure ❷
bE(tween) Not in use
St(op) Forces actuator to stop pressure control
Adaptation Performs actuator adaptation drive to adapt available
traveling range
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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Pressure controller 327VMZ-MB - User Manual
USE
❺Mode 0-10V analog control, 0-10V feedback signal
Normal rotation direction (clockwise)
x
(Round dampers)
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)
0-10V analog control, 0-10V feedback signal
Inverse direction of rotation (counter-clockwise) x (ERPA)
Inverse direction of rotation (counter-clockwise)
Used only with ERPA!
❻
Com.
Bus address and communication parameter settings for bus communication.
When navigated to the menu item ❻ 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 Modbus - b14
⑤Desired selection is finally accepted by pushing the LED push button
❼Nom. Used for compensating the length of measuring tube. If the tube is longer than 10 m, contact FläktGroup’s technical
support. Value can be only changed through Modbus interface. 300
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Pressure controller 327VMZ-MB - User Manual
USE
5.5 ANALOG SIGNALS
5.5.1 Analog input signal Y
The analog input signal Y allows to control the 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 holding register 123 in Service registers table on page 16.
In mode 0…10 VDC the analog input signal Y matches to the following
pressures:
Pact = Pmin + x (Pmax - Pmin)
and the pressure match to the analog input signal Y:
Y = 0 V
DC
= Pmin
Y = 10 V
DC
= Pmax
Y = 10 V
DC
x
In mode 2…10 VDC the input signal Y matches to the following pres-
sures:
Pact = Pmin + x (Pmax - Pmin)
and the pressures match to the analog input signal Y:
Y = 2 V
DC
= Pmin
Y = 10 V
DC
= Pmax
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
______
Pact - Pmin
Pmax - Pmin
__________
Y-2 V
DC
8 V
DC
_________
Pact - Pmin
Pmax - Pmin
__________
5.5.2 Analog output signal U
Output signal U follows the selected mode of operation and shows the
actual pressure P
act
normalized to the selected P
nom
value.
In mode 0…10 VDC the output signal U matches to the following pres-
sure values:
U = 10 V
DC
x U = 10 V
DC
x
and to calculate the actual pressure P
act
from the feedback signal U:
Pact = 300 Pa x Pact = 1.2 inWC x
In mode 2…10 VDC the output signal U matches to the following pres-
sures:
U = 2 V
DC
+ 8 V
DC
x U = 2 V
DC
+ 8 V
DC
x
and to calculate the actual pressure P
act
from the feedback signal U:
Pact = 300 Pa x Pact = 300 Pa x
Characteristic of feedback signal U in both input modes
Pact
300 Pa
________
Pact
300 Pa
________
Pact
1.2 inWC
__________
Pact
1.2 inWC
__________
U
10 V
DC
_______ U
10 V
DC
_______
__________
U - 2 V
DC
8 V
DC
__________
U - 2 V
DC
8 V
DC
PNom
.
Pressure
10 VDC
2
0
(100%)
Control range
10
U
8
U – 2
Vact = VNom
. .
Vact = VNom
. .
Actual pressure U
Mode 0 ... 10 VDC
Mode 2 ... 10 VDC
Pressure
PNom
Reference signal Y 10VDC2
0
0
.
.
Pref = (Pmax – Pmin) + Pmin
Y – 2
8
. . . .
Pref = (Pmax – Pmin) + Pmin
Y
10
. . . .
Pmax
.
Pmin
.
Mode 0 ... 10 VDC
Mode 2 ... 10 VDC
Pnom is a fixed nominal pressure value. P
nom
is the absolute maximum
control limit value for P
min
and P
max
pressure values.
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Pressure controller 327VMZ-MB - 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
6 MAINTENANCE
6.1 HOW TO MAINTENANCE
The 327VMZ-MB compact controller is maintenance free. Control unit
can be cleaned with a damp cloth if necessary.
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Pressure controller 327VMZ-MB - 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 is self-monitoring its individual status. In normal operation no error messages 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 traveling range
tSt Test drive The actuator is performing a test drive
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 ❹ Diag 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 -
Er 3Fatal error Either the actuator or the complete product needs to be
replaced 50% open
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Pressure controller 327VMZ-MB - User Manual
MODBUS INTERFACE
8 MODBUS INTERFACE
8.1 TECHNICAL DATA
Protocol Modbus RTU
Medium
Cable 1000 mm,
2 x 0,38 mm2 (halogen free) RS-485,
not electrically isolated
Number of nodes Max. 128
Baudrates 1200 / 2400 / 4800 / 9600 / 19200 / 38400 /
76800 / 115200 Bd
Byte sequence MSB / LSB
Byte formats
1 start bit, 8 data bits, 2 stop bits, no parity
1 start bit, 8 data bits, 1 stop bit, even parity
1 start bit, 8 data bits, 1 stop bit, odd parity
Termination external (120 Ω)
Response time ≤ 10 ms + delay
Delay Configurable 0...765 ms
8.2 DEFAULT MODBUS SETTINGS
Transmission mode RTU
Address 1
Transfer rate 19200 bps
Data bits 8
Parity Even
Stop bits 1
Delay 0 ms
Response time 10 ms + delay
8.3 MODBUS MESSAGE FRAME
Address Funktion code Data CRC End
1byte 1byte N*1byte 2bytes 3,5 char *
*
Message frames are separated from each other by a silent interval of
at least 3.5 * character time.
8.4 SUPPORTED MODBUS FUNCTION CODES
Function code Name Description
03H Read holding register
Device parameter/
actual values read
(integer/float)
06H Write single register Device parameter
single word write
8.5 DATA TYPES
The data types that are used for each register can be found from
Modbus registers section.
CHAR is an 8-bit value. CHAR value uses the low byte of a word
register.
BYTE is an 8-bit integer value. BYTE value uses the low byte of a word
register.
WORD is an 16-bit integer value. Word value uses the low byte and the
high byte of a word register (except explicitly noted otherwise).
8.6 CRC
CRC is calculated according to “MODBUS over Serial Line, Specification
and Implementation Guide V1.02”.
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Pressure controller 327VMZ-MB - User Manual
MODBUS REGISTERS
9 MODBUS REGISTERS
9.1 OPERATION VALUES
Number Name Address Data type Value range Read/write Description Default
1Setpoint 0WORD 0...10 000 R/W
Shows/sets Setpoint [%]
0 ...100.00% matches on Min and Max
0% = Min
100% = Max
The register is read only,
if register 123 = 0 or 3
-
2Override control 1WORD 0...8 R/W
Sets Override
’0’ = No override
’1’ = Open
’2’ = Close
’3’ = Min
’4’ = Max
’5’ = Between, not in use
’6’ = Fast open
’7’ = Fast close
’8’ = Stop
0
4Device ID 3WORD 0...6 R
Shows Device ID
’0’ = No actuator
’1’ = HVAC / water actuator
’2’ = VAP/VAV actuator
’3’ = Fire protection actuator
’4’ = GUAC VAV
’5’ = GUAC CM
’6’ = GT
2
5Relative position 4WORD 0...10 000 RShows relative position [%] 0...100.00 -
6Absolute position 5WORD 0...65535 RShows absolute position [°] 0...650.00 -
7Relative pressure 6WORD 0...10 000 RShows relative pressure [%] 0...100.00 -
8Absolute pressure 7WORD 0...65535 RShows absolute pressure in selected unit
[Pa, inWC x 1000
-3
]-
9Analog input Y 8WORD 0...10 000 R
Shows signal value of analog input Y
[mV] 0...10000
The register value is not valid if forced
control is activated via analog input.
-
11 Analog output U 10 WORD 0...10 000 R/W
Sets analog output U [mV] 0...10 000
See also register 123
-
21 Absolute setpoint 20 WORD Min...Max R
Shows absolute setpoint [Pa, inWC x 1000
-3
]
The value is limited between Minimum and
Maximum pressure.
-
FläktGroup DC_10751GB 20231124_R0 Specifications are subject to alteration without notice.
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Pressure controller 327VMZ-MB - User Manual
MODBUS REGISTERS
9.2 SERVICE VALUES
The values are used only when commissioning the damper or monitoring status. Do not write values constantly to the Service registers.
Number Name Address Data type Value range Read/write Description Default
101 Serial number 1 100 WORD 101...9912 RSerial number yy/mm
102 Serial number 2 101 WORD 100...3123 RSerial number dd/hh
103 Serial number 3 102 WORD 1...59599 RSerial number mm:ss.x
x = test number
104 Software version 103 WORD 1...65535 RShows software version -
105 Service information 104 WORD 1...65535 RShows status of the actuator
See status register table. -
106 Min. value relative 105 WORD 0...10 000 R/W Sets Min value [%] 0... 100.00% 0
107 Max. value relative 106 WORD 0...10 000 R/W Sets Max value [%] 0... 100.00% 10 000
108 Sensor type 107 WORD 0...4 R/W
Sensor type
’0’ = No sensor
’1’ = Active sensor [mV]
’2’ = Passive sensor [1k]
’3’ = Passive sensor [1...20k]
’4’ = Digital 0/1
1
109 Bus fail position 108 WORD 0...5 R/W
Sets the actuator position when no
communication on bus within 120 seconds
’0’ = Last setpoint. De-activates bus fail position
function if analog control is used.
’1’ = Closed position at bus monitoring timeout
’2’ = Open position at bus monitoring timeout
’3’ = Min pressure at bus monitoring timeout
’4’ = Btw pressure at bus monitoring timeout
’5’ = Max pressure at bus monitoring timeout
0
110 Bus fail timeout 109 WORD 1...65535 R/W Bus fail timeout 120 s
121 Min. value absolute 120 WORD 0...65535 R/W Sets Min value in selected unit [Pa, inWC x 1000-
3
] 0
122 Max. value absolute 121 WORD 0...65535 R/W Sets Max value in selected unit [Pa, inWC x 1000
-3
]300 Pa
123 Setpoint source and
analog output mode 122 WORD 0...3 R/W
Sets setpoint reference and analog output mode
0
Value of the
register
Setpoint
source
Value of Output
signal U
0Setpoint from
analog input Y
Analog to actual
pressure 0(2)...10V
1
Setpoint from
register 1
Analog to actual
pressure 0(2)...10V
2
Setpoint from
register 1
Value from
register 11
3Setpoint from
analog input Y
Value from
register 11
131 Modbus address 130 WORD 1-247 R/W Sets device Modbus address 1
227 Height correction 226 WORD 1...6000 R/W
Height correction for installations above sea
level in meters. Can be used for air density
compensation and for compensating pressure
loss in the measuring hose, also. For more
information, refer to EMPA/EMPD or ERPA
Installation, commissioning and maintenance
manual for more information.
0 m
569 Modbus communication
parameter 568 BYTE 0...32 R/W
Sets Modbus communication settings
See Modbus comm. settings register table.
Note: Stored value starts from 0.
13
570 Modbus response delay 569 BYTE 0...255 R/W
Some master devices require a delay when
switching from transmission mode to reception
mode. This response delay is added to 3.5
characters at the end of the message. The delay
time is adjustable in steps of 3 ms x 0...255.
0
770 Mode register 769 WORD 1...65535 RShows override status
See Mode register table. -
FläktGroup DC_10751GB 20231124_R0 Specifications are subject to alteration without notice.
17
Pressure controller 327VMZ-MB - User Manual
MODBUS REGISTERS
9.3 STATUS REGISTER (MODBUS REGISTER 105)
The status register makes possible to monitor a health of the actuator.
bit Description Action if bit value is 1
00 = Everything OK
1 = Memory corrupted The actuator needs to be replaced.
10 = Everything OK
1 = Memory corrupted The actuator needs to be replaced.
20 = Everything OK
1 = Password protected memory space open
Contact FläktGroup technical support.
Do not restart or power off the actuator!
30 = Everything OK
1 = Password protected memory space open
Contact FläktGroup technical support.
Do not restart or power off the actuator!
40 = Everything OK
1 = Fatal error The actuator needs to be replaced.
5
0 = Everything OK If bit 12 = 1 actuator has reached end position.
1 = The actuator has detected a mechanical block or has reached end
position
If bit 12 = 0 actuator might be blocked. Ensure there is no physical obstacles
preventing actuator from moving. Use override Open and Close controls to
move actuator both directions.
60 = Normal operation
1 = Seepage flow detected
The actuator drives to closed position.
Check that there is sufficient pressure in the duct.
70 = Motor is not driving
1 = Motor is driving No actions needed.
8Not used
9Not used
10 Not used
11 0 = Normal operation
1 = Motor timeout fault Contact FläktGroup technical support.
12 0 = Actuator within normal operation range
1 = Actuator has reached the end position
If forced control or override Open or Closed is not activated,
check that pressure to the actuator is sufficient.
13 0 = Control loop not running
1 = Control loop running No actions needed.
14 0 = Control loop not in dead band
1 = Control loop in dead band No actions needed.
15 0 = Normal operation
1 = Restart at next main loop event No actions needed.
FläktGroup DC_10751GB 20231124_R0 Specifications are subject to alteration without notice.
18
Pressure controller 327VMZ-MB - User Manual
MODBUS REGISTERS
9.4 MODBUS COMMUNICATION SETTINGS REGISTER (MODBUS REGISTER 569)
Register value Actuator display value Baudrate Parity Stop bits
0b1 1200 None 2
1b2 1200 Even 1
2b3 1200 Odd 1
3b4 2400 None 2
4b5 2400 Even 1
5b6 2400 Odd 1
6b7 4800 None 2
7b8 4800 Even 1
8b9 4800 Odd 1
9b10 9600 None 2
10 b11 9600 Even 1
11 b12 9600 Odd 1
12 b13 19200 None 2
13
1)
b14 19200 Even 1
14 b15 19200 Odd 1
15 b16 38400 None 2
16 b17 38400 Even 1
17 b18 38400 Odd 1
18
2)
b19 1200 None 1
19
2)
b20 2400 None 1
20
2)
b21 4800 None 1
21
2)
b22 9600 None 1
22
2)
b23 19200 None 1
23
2)
b24 38400 None 1
24
2)
b25 76800 None 1
25
2)
b26 115200 None 1
26 b27 76800 None 2
27 b28 76800 Even 1
28 b29 76800 Odd 1
29 b30 115200 None 2
30 b31 115200 Even 1
31 b32 115200 Odd 1
1)
default Modbus communication parameter
2)
not according Modbus spesification
FläktGroup DC_10751GB 20231124_R0 Specifications are subject to alteration without notice.
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Pressure controller 327VMZ-MB - User Manual
MODBUS REGISTERS
9.5 MODE REGISTER (MODBUS REGISTER 770)
The status register makes possible to check settings of the actuator and monitor active overrides.
bit Description Values
0Analog signal mode 0 = 0-10V mode selected
1 = 2-10V mode selected
1Setpoint source 0 = Setpoint from analog input Y
1 = Setpoint from Modbus
2Override control CLOSED 0 = Closed override control not active
1 = Closed override control active
3Override control OPEN 0 = Open override control not active
1 = Open override control active
4Override control BETWEEN 0 = Between override control not active
1 = Between override control active
5Override control MAX 0 = Maximum pressure override control not active
1 = Maximum pressure override control active
6Rotation direction reversed
0 = Normal rotation direction (Round dampers)
1 = Reversed rotation direction (ERPA)
Contact FläktGroup technical support if rotation direction is incorrect to the
device in question.
7Motor control
0 = Motor control enabled
1 = Motor control disabled
Contact FläktGroup technical support
8Override control MIN 0 = Minimum pressure override control not active
1 = Minimum pressure override control active
9Forced control CLOSE active 0 = Close forced control not active
1 = Negative rectified half-wave connected to analog input Y
10 Forced control OPEN active 0 = Open forced control not active
1 = Positive rectified half-wave connected to analog input Y
11 Forced control MAX active 0 = Maximum pressure forced control not active
1 = Full-wave or 24 VDC connected to analog input Y
12 Forced control MIN active
0 = Minimum pressure forced control not active
1 = Analog input Y disconnected or analog signal is 0/(2) V at analog input Y
13 Analog input signal 10V (MAX pressure) 0 = Analog input signal not equal to 10 V
1 = Analog input signal equal to 10 V
14 Forced control CLOSE active 0 = Closed forced control not active
1 = Grould potential connected to analog input Y in 2-10V mode
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