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Control and Protection Functions
The last device terminal resistor setting is performed on
the last frequency inverter in the line connection. Refer to
the Modbus bus wiring diagram. The setting procedure of
the last terminal resistor is described in the documentation
for a corresponding frequency inverter. A 120 Ohm resistor
connected between the communication can also be used to
terminate the wiring.
Figure 9 – Inverter connection to the Modbus RTU
FM1
Master
controller
Fan Failure Detection
n
To detect any fan failure, the motor thermo-contact and
differential pressure sensor are connected to the frequency
inverter inputs. The information provided by these elements
is transmitted through the Modbus communication line to the
control system, where it is processed.
Modbus RTU Communication Settings
n
Each frequency inverter connected to the bus must be
assigned a unique address as defined in the control system
data points.
Pre-set Frequency Inverter Addresses – ModBus:
Inlet Fan
Inlet fan
Backup or twin fan
Backup twin fan 1
Backup twin fan 2
Outlet fan
Outlet fan
Backup or twin fan
Backup twin fan 1
Backup twin fan 2
Auxiliary Fan
Auxiliary fan
Twin fan
Rotary Heat Regenerator
RHR motor address =11
n
The data points of all frequency inverters for communica-
tion with the Modbus bus must be set in accordance with the
VCS control unit:
• Baud rate (9600 Bd – pre-set)
• Parity (none – pre-set)
• Number of stop bits (2 stop bits – pre-set)
• Response time limit
• Number of data bits (as standard, 8 bits – pre-set)
All data points for the used frequency inverters are available
on our website: www.remak.eu
10
FM2
FM3
RS485
terminal
resistor
address =1
address =2
address =3
address =4
address =5
address =6
address =7
address =8
address =9
address =10
Warning
Frequency inverters cannot be confused within different
sections! For proper assignment of frequency inverters to
respective sections, the inverters are labeled with attached
identification information (order/device + section, or unique
item number) and documentation showing the depiction of
the corresponding section to which the converter belongs.
Figure 10 – Inverter association with a corresponding
section
Corresponding
section number
Warning
The frequency inverter association cannot be exchanged
between different sections! For information about frequency
inverter association with a corresponding section, refer to
the figure.
or item
Order (project)
Device (unit)
Frequency inverter
Relevant section
5
Order
number
number label
item number
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