Lindab UltraLink FTMU Manual

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Technical information
LindabUltraLink®Monitor
FTMU

2We reserve the right to make changes without prior notice We reserve the right to make changes without prior notice
Introduction
UltraLink®FTMU is a highly accurate flow monitor without any obstacles in the
airstream that creates pressure drop. It measures the flow with an angled ultrasonic
beam which can be calculated and compensated to a very high accuracy over the
whole flow range. The method is very stable over time due to that it is not sensitive
to dirt and the design minimizes the dust accumulation on the flow sensors.
An increased focus on energy saving has led to ventilation systems requiring low
minimum flows. The low flows are a problem since they are very difficult to mea-
sure, which makes it difficult to control the ventilation system.
The new technology of UltraLink®makes it possible to measure lower air flows
compared to today’s products while maintaining measurement accuracy. This
offers great advantages for the user in terms of comfort and savings in energy
consumption, which is of great interest.
Content
Introduction ....................................................................................................2
Overview ........................................................................................................3
Description .....................................................................................................3
Planning..........................................................................................................4
Mounting ........................................................................................................6
Connections ...................................................................................................6
Power supply..................................................................................................8
Display............................................................................................................9
Settings ..........................................................................................................9
ID-numbers .................................................................................................. 12
Troubleshooting ........................................................................................... 12
Technical data .............................................................................................. 13
Airflows......................................................................................................... 13
Maintenance................................................................................................. 13

3
We reserve the right to make changes without prior notice
Description
Application
The Monitor is suitable for measuring air flow and tem-
perature. Communication is established via digital signal
using Modbus.
Design
The monitor consists of a sensor body with Lindab Safe
gaskets.
Two flow sensors are mounted on the sensor body and
connected to a display unit. The display unit is mounted
ontop of a shelf on the sensor body.
Note! The flow sensors are placed at a fixed distance
to each other and they shall never be removed and
not used as handles when turning the sensor body.
Overview
Airflow
IP42
Patented
Status
m³/h
l/s
m/s
°C
Mode
Monitor FTMU
Status light Air flow direction
Mode button
Display parameters
CE-mark
IP classification
Display unit
Flow sensor
Sensor body
Display unit
Airflow
IP42
Patented
Status
m³/h
l/s
m/s
°C
Mode
Monitor FTMU
Air flow
direction

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Planning
The longer distance to disturbance, i.e. the longer straight duct before the Monitor, the higher the measurement accuracy
will be. However this is not the only factor which affects the accuracy of the measurement. The rotation of the Monitor and
hence the positioning of the first flow sensor has an impact on the uncertainty of the measurement. It is not recommen-
ded to mount the Monitor so that the first flow sensor (*) is placed on an outer radius of a fitting.
For example: in the case of the bend in the table below, by rotating the Monitor to position the first flow sensor according
to the first picture (with the first flow sensor on the inner radius of the bend), the Monitor can be placed at the distance
of two duct diameters from the disturbance to achieve 5 % uncertainty. Positioning the Monitor according to the second
picture (with the first sensor on the outer radius of the bend), the Monitor must be mounted five duct diameters from the
disturbance to achieve the same level of uncertainty.
Never use an UltraLink®on the outlet side of a duct fan. Place it on the inlet side or in worst case use a flow conditioner if
it must be placed on the outlet side. Minimum straight distance after Monitor is 1×Ød.
Disturbance * Placement of first flow sensor
Measurement uncertainty
± % or 1 l/s depending wich is
the greatest
a
2-4·Ød >4-5·Ød >5·Ød
Bend
a
Ød *
Inner radius 5 5 5
Bend
a
Ød
*
Outer radius
(Not recommended) 20 10 5
Bend
a
Ød
*
a
Ød
*
Side 10 5 5

5
We reserve the right to make changes without prior notice
Disturbance * Placement of first flow sensor
Measurement uncertainty
± % or 1 l/s depending wich is
the greatest
a
2-4·Ød >4-5·Ød >5·Ød
Reducer
a
Ød
*
Duct diameter
decrease 5 5 5
Reducer
a
Ød
*
Duct diameter increase 10 5 5
T-piece
a
Ød
*
Inner radius 10 5 5
T-piece
a
Ød
*
Outer radius
(Not recommended) 20 10 5
T-piece
a
Ød
*
Side 10 5 5
a
Ød
*

6
24V +B -A SH GND GND GND AO1 AO2 AIN MO1 MO2
1 2 3 4 5 6 7 8 9 101112
We reserve the right to make changes without prior notice We reserve the right to make changes without prior notice
Connections
Connect the Monitor to a remote terminal unit using
RS485 or analog terminals. Connections are made in the
terminal board which can be accessed when the lid of the
display unit is removed.
1. 24V, power supply (AC G, DC +) *
2. GND, power supply (AC G0, DC -) *
3. +B, connection for Modbus via RS485
4. -A, connection for Modbus via RS485
5. SH, shield
6. GND, ground (system neutral)
7. AO1, analog output
8. AO2, analog output
9. AIN, (not used in this version)
10. MO1, (not used in this version)
11. MO2, (not used in this version)
12. GND, ground (system neutral)
Mounting
Position the Monitor so that the display is visible from
some direction. For future connections it is important that
the screws on the lid of the display can be removed.
Make sure the airflow arrow is pointing in the direction of
the airflow.
Note the ID-number of the Monitor. The ID can be found
on the label of the box it was delivered in or on the label
on the Monitor itself and are the three last numbers of the
serial no.
Mount the Monitor into the air duct system according to
the mounting instructions for Lindab Safe. Do not use
the flow sensors as handles when you mount the Monitor
since this may cause damage and changes in their posi-
tions might effect the measurement accuracy.
To be able to connect cords to the terminal board the
rubber cable grommet on the backside of the display unit
must be punctured, preferably using an awl or something
else pointy to ensure tightness to the environment. When
the cords have been connected they must be strain
relieved. The cords can be attached to the shelf by using
cable ties that are attached around cut outs in the shelf.
You must under no circumstances make any holes or
connect anything with screws to the sensor body since
this will have an impact on measurement accuracy!
*) When using AC terminal 1 (G) should be system potential and terminal 2 (G0) should be system neutral.
Recommendations for wiring:
Function Cable type
24 V Supply 2-wire, thickness depending on length and load, max. 1,5 mm²
RS485 2-wire shielded twisted pair, min. 0,1 mm² (LIYCY cable)
Supply the Monitor with power from a transformer.

7
Om enbart UltraLink®-enheter är anslutna till busslingan kan du felsöka genom
att mäta den totala resistansen mellan +B och-A. Uppmätt resistans ska över-
ensstämma ungefär med tabellen (RTU ska kopplas från).
Om den uppmätta resistansen avviker mer än 3% från värdena i tabellen finns
troligen en felaktig anslutning någonstans. Koppla bort busslingan från mäten-
heten och dela den någonstans i mitten. Mät sedan busslingans två halvor för att
räkna ut var den felaktiga anslutningen finns. Fortsätt tills du har isolerat proble-
met. En uppmätt resistans som är korrekt garanterar inte att alla anslutningar är
korrekta, men det är en mycket bra indikation!
Om busslingan är längre än 300meter eller om det finns fler än 30 enheter, kan
systemet behöva en RS485-signalförstärkare (FDS-R) för att kunna kommuni-
cera på ett effektivt sätt.
FDS-R
signalförstärkare
UltraLink®-en-
heter på buss
[st.]
Resistans
[kΩ]
1260
2130
386,5
464,9
551,9
643,3
737,1
832,4
928,8
10 26,0
24V +B -A SH GND GND GND AO1
AO2 AIN MO1 MO2
1 2 3 4 5 6 7 8 9 10 1112
24V +B -A SH GND GND GND AO1
AO2 AIN MO1 MO2
1 2 3 4 5 6 7 8 9 10 1112
24V +B -A SH GND GND GND AO1
AO2 AIN MO1 MO2
1 2 3 4 5 6 7 8 9 10 1112
24V +B -A SH GND GND GND AO1
AO2 AIN MO1 MO2
1 2 3 4 5 6 7 8 9 10 1112
BA
+B -A +B -A +B -A +B
-A
Analog anslutning
När mätenheten ansluts för kommunikation med analoga signaler är det viktigt att den utgående analoga signalen på
mätenheten (AO1, AO2) ansluts till de analoga ingångarna på RTU-enheten. Se även till att ansluta kablarna till samma
analoga jordning.
We reserve the right to make changes without prior notice
Digital connection
Connect A on the RTU to -A on the display unit and B to +B. When connecting more than one Monitor in series it is impor-
tant to keep connecting A to A and B to B since crossing them will stop Modbus from working. The shield in the RS485
cable should be continuous over the entire bus, it should ne connected to ground before or at the first UltraLink®and at
the last UltraLink®. Do not connect the shield to ground on more points to avoid ground loops. It is recommended to use
RS485 cables with twisted pairs and shield, do not supply power in the same cable unless the cable is produced for that
purpose.

8We reserve the right to make changes without prior notice We reserve the right to make changes without prior notice
Power supply
Transformer sizing
The needed size of 24 V AC transformer(s) can be defined
by adding up the dimensioning power consumption [VA]
of all the components. The transformer power must
exceed this. Use only safety isolating transformers. Cal-
culation of the current demand I:
I = (P1+P2+…+Pn) / U [A]
where:
Pnis the dimensioned power consumption for each com-
ponent [VA] U is the voltage (24) [V].
If the current demand I exceeds 6 A ( which corresponds
to approximately 150 VA for a 24 V AC transformer ), it is
necessary to use more transformers to prevent overhea-
ting.
Supply cable sizing
The wire size of the supply cable can be determined by
calculating the resistance per meter R. The calculation
presupposes that a voltage drop of e.g. 2 V is accepted in
the supply cable:
R(per m) = Udrop / (I * L) [Ω/m]
where:
Udrop is the accepted voltage drop (2 V) in the cable [V] I is
the current [A]
L is the longest distance of supply cables from transfor-
mer to a component [m]
Wire cross section area as a function of resistance per m for copper wire
0,7
0,6
0,8
0,9
1
1,1
1,2
1,3
1,4
1,5
Wire cross section Area [ mm2 ]
0
0,1
0,2
0,3
0,4
0,5
0,20
0,15
0,100,050
Copper Resistance [ Ω/m ]
Example:
Udrop = 2 V, I = 4 A, L = 20 m
R (per m) = 2V / (4A × 20 m) = 0,025 Ω/m
In the diagram a Wire cross section Area of 0,7 mm² can
be read.
Power consumption
The power consumption for dimensioning supply cables
for an UltraLink®Monitor is 0,5 VA.
It is not recommended to use a transformer with a
higher capacity than 150 VA!

9
We reserve the right to make changes without prior notice
Display
The display can show useful information both with the green
diode (status light) and with parameters in the LCD.
By short pressing the mode button you can change the
displayed parameter. If the button is pressed for more than
5 seconds (long press) then the configuration menu will be
visible. The arrow at the bottom of the display indicates the
current parameter type and unit.
The following parameters can be shown:
• Air flow (m³/h)
• Air flow (l/s)
• Air velocity (m/s)
• Temperature (°C)
• Monitor’s ID number
The standard setting for the display shows the air flow in
m³/h.
For a detailed description on configurating the UltraLink
using the mode button on the display, see page 11.
Status light
The status light indicates:
Mode Function
No light Monitor is turned off
Flashing light A problem has occured
Constant light Monitor is turned on and functioning as normal
Settings
When the monitor is connected to Modbus communication there are many settings that can be made. These are the most
common:
General settings
#ADDR Name Type Scale Unit Standard Comment
3×150 Flow speed Float 1m/s
3×152 Flow speed Float 1 m3/h
3×154 Flow speed Float 1l/s
3×200 Temperature 16 bit 10 C
3×013 Unit status 16 bit 1 -
0 = Normal mode
1 = Reserved for future use
2 = Reserved for future use
3 = Measurement error
Communication settings
#ADDR Name Unit Standard Comment
4x002 RS485 Baud Rate Configuration Baud rate 1
0 = 9600
1 = 19200
2 = 38400
3 = 76800
4x003 RS485 Parity Configuration Parity 10 = Odd;
1 = Even;
4x004 RS485 Stop Bit Configuration No. of
stop bits 11 or 2

10 We reserve the right to make changes without prior notice We reserve the right to make changes without prior notice
Analog output settings
#ADDR Name Unit Standard Comment
4x400 Analog Output 1 Level Configuration 2
0 = 0-10 V
1 = 10-0 V
2 = 2-10 V
3 = 10-2 V
4x401 Analog Output 1 Unit Configuration 0
Display:
0 = Flow
1 = Temperature
4x402 Analog Output 1 Temperature Minimum 0
4x403 Analog Output 1 Temperature Maximum 50
4x404 Analog Output 1 Flow Minimum 0
4x405 Analog Output 1 Flow Maximum *
Is always 7 m/s which is
depending on dimension
see table “Flow Maximum”
4x430 Analog Output 2 Level Configuration 2
0 = 0-10 V
1 = 10-0 V
2 = 2-10 V
3 = 10-2 V
4x431 Analog Output 2 Unit Configuration 1
Display:
0 = Flow
1 = Temperature
4x432 Analog Output 2 Temperature Minimum 0
4x433 Analog Output 2 Temperature Maximum 50
4x434 Analog Output 2 Flow Minimum 0
4x435 Analog Output 2 Flow Maximum *
Is always 7 m/s which is
depending on dimension
see table “Flow Maximum”
Flow maximum
Ød1* *
nom m3/h l/s
100 198 55
125 309 86
160 506 141
200 791 220
250 1236 343
315 1963 545