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Operating and Maintenance Instructions
4.3.2 Auto addressing fans using the fan's serial numbers
•
To initiate the auto addressing the Main Menu should be displayed (see Figure 5 above). Select 'Fan
Addressing' followed by 'New Fan Array' followed by the ENTER button (See H1 – Fan Addressing -
New Fan Array -Initial Setup)
•
Add the total number of fans connected to the MDC by using the UP and DOWN buttons then press
ENTER button twice
For the MDC to locate the fans on the network, all fans must be in the factory default of MODBUS address 1, Baud
rate 19200 and parity 8E1. If the fan array has been previously configured for a different address, baud rate or
parity setting, they must be returned to the factory set condition before the controller can run the auto address
sequence. Changing all fans to Modbus address 1 can be achieved by going to "Advanced Settings" and "Factory
Settings" of the fan providing they are all configured to factory default baud rate 19200 and parity 8E1.
In the process of addressing the fans, the MDC uses the fan's manufacturing serial number to identify each
individual fan. The addressing is performed in ascending order, where fans with the lowest serial number have the
lowest Modbus address and Fan number assigned. The controller starts assigning addresses to the fans from
Modbus address 2 up to 102.
An example of a fan array consisting of 3 fans:
Fan Z has Serial Number 1327006PDZ – Controller Assigns MODBUS Address 2 – this is FAN 1.
Fan X has Serial Number 1527006PDS – Controller Assigns MODBUS Address 3 – this is FAN 2.
Fan Y has Serial Number 1527006PDZ – Controller Assigns MODBUS Address 4 – this is FAN 3.
Please ensure that all fans within the array are correctly wired and switched on before trying to address them
Note: After the fans have been automatically addressed it is possible to manually change the FAN number
as seen by the controller e.g. FAN 1, FAN 2, etc by going to the "Fan Re-addressing" menu.
See 4.6 Changing the fan addressing order
Note: The auto addressing option will disappear after all fans have been addressed. This can be reversed
by using the "Factory Reset" option inside "Main Menu -> Advanced Settings".
In case of an error during auto addressing, the fans must be physically inspected to ensure they are correctly
wired and switched ON before retrying. It is also recommended, in all cases, to reset the MDC and fans to
factory settings before retrying.
Please ensure the total number of fans entered truly reflects the total number of fans available in the fan array
to avoid a possible dead-lock scenario
4.3.3 Configuring the MDC with fans that have been pre-configured
If the MDC is being retrofitted to an existing array of fans that have been pre-configured with individual Modbus
addresses, ensure all fans are connected to the MDC's RS485 Master port and:
•
Select "Fan Addressing" followed by "Existing fan array" using the ENTER button (See H2 – Fan
Addressing - Existing Fan Array - Initial Setup).
•
Add the total number of fans connected to the MDC by using UP and DOWN buttons and then press
ENTER button twice.
210-OMI14229-Iss2
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Operation & Maintenance Instructions
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