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Operating and Maintenance Instructions
4.5 Power Meter screen
The power meter screen as shown in Figure 7 below is accessible by pressing the ENTER button when
displaying the status screen of the last fan in the array. See H6 – Status.
The total power consumption is a real-time measurement and consists of the sum of the power consumption from
each fan (in Watts) converted into Kilowatts. For larger fan arrays it may take some time to read this value the first
time as the MDC is polling several registers from each fan in order to derive the individual fan power which will then
be converted into total fan array power consumption.
If a fault occurs to one of more fans whilst the Power Meter Screen is being displayed, the MDC will remain on
the Power Meter Screen and will switch on the red LED for alarms and/or communication loss or the yellow
LED for warnings. After leaving the Power Meter screen, the MDC will automatically display the fan
experiencing an alarm or a communication loss.
4.6 Changing the fan addressing order
The fan auto-addressing procedure is described in 4.3.2 Auto addressing fans using the fan's serial numbers.
The automatic assignment of Modbus addresses to fans can be inconvenient for the user as the preference for the
fan addresses 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 individually re-address each fan such that their Modbus addresses and fan numbers
match the equipment or building layout.
This option becomes available in the main menu under 'Fan Re-Addressing' option once the fans have initially been
found and auto-addressed by the MDC. 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. See the "Address" part of H1 – Fan Addressing - New Fan
Array -Initial Setup.
By selecting a fan and pressing ENTER, it is possible to assign a different Fan number & Modbus address to the
selected fan using UP or DOWN buttons and then pressing ENTER again.
Note: As a fan changes its fan number and address, the fan currently staying at that target fan number
and address will be changed to the selected fan's old fan number and address - effectively "swapping" them
Note: This feature is not available when using the controller with only one fan
Note: It is not possible to assign an address outside the address range derived during the auto-addressing
process as a fan address is linked to the fan number e.g. if using the MDC with a 4-fan array, the MDC cannot
have one of the fans at Modbus address 6 because its fan number would have been 5
210-OMI14229-Iss2
© ebm-papst UK Ltd 2018
Indication of Fan Array Size
Figure 7 – Power meter screen
IMPORTANT
Operation & Maintenance Instructions
Chelmsford Business Park Chelmsford Essex CM2 5EZ
Telephone: +44(0)1245468555 Fax: +44(0)1245466336
e-mail
sales@uk.ebmpapst.com
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