Operating and Maintenance Instructions
210-OMI14229-Iss8.1
CN1116 Full OMI
Page 12 of 47
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4.6 Swapping fan numbers and addresses
The automatic assignment of Modbus addresses to fans can be inconvenient for the user as the preference for the
fan addresses/numbers may be to follow a logical addressing based on the position of the fans in the array or
building. For this reason, it is possible to swap fan numbers and addresses such as to match the equipment or
building layout.
This option becomes avail
able in the main menu under ‘Fan Re
-
Addressing’
option once the fans have initially been
found and auto-addressed by the controller. Under this option, a list of fans is displayed where it is possible to see
each fan’s
fan number, Modbus address and serial number.
In cases where it is desirable to match the fan numbers with the equipment or building layout, and if the installation
has a circuit breaker for each fan installed in the desired equipment or building layout, we recommend switching
one of the fans off
using the fan’s circuit breaker while on the Fan Readdressing menu
and then checking which
fan serial number changed
to an “Alarm” (and eventually “No Comms”
) text.
Take note of that fan’s number
together with the circuit breaker number, switch the fan back on and move to the
next fan. Once all fans have been processed, the notes will become a guide of how to proceed in swapping fan
numbers to achieve a match between the fan numbers and the equipment or building layout.
By selecting a fan from the list and pressing the ENTER button, it is possible to assign a new fan number/Modbus
address to that fan by using the UP and DOWN buttons. Press ENTER again and the controller will assign the
selected fan number/Modbus address to the fan.
Note 1:
As a fan changes its fan number and address, the fan currently at that target fan number and address
will be changed to the
selected fan’s old f
an number and address -
effectively “swapping” them
.
Note 2:
This feature is not available when using the controller with only one fan.
Note 3:
It is not possible to assign a fan number outside the total number of fans e.g. if using the controller
with a 4-fan array, the fan numbers will be restricted to 1-4, with the corresponding Modbus addresses 2-5.
Note 4:
It is not possible to change the fan number and address
when using “Fan” as a “Sensor Input”
.
5.0
Operating Modes
5.1 General
The controller can be configured to operate in four different modes:
•
Monitor (Default)
•
Monitor & Control
•
Constant Volume/ Constant Pressure
•
Modbus Relay
In
“
Monitor
”
operating mode the fans remain in their factory default settings where they are speed controlled using
their 0-10V inputs. In
“
Monitor & Control
”
and
“
Constant Volume / Constant Pressure
”
modes the controller
automatically changes the settings of each fan to allow speed control via Modbus and the analogue inputs of the
fans can no longer be used for speed control. The controller automatically changes the speed control method of
each fan when changing between different operating modes so there is no need to manually connect to each fan
and configure its speed control method.
