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Operating and Maintenance Instructions
5.8 Fan replacement
The MDC allows a single fan in the array to be replaced at a time. It is important that the replacement fan is in its
factory default conditions with Modbus Address 1, Baud 19200 and parity 8E1.
When replacing a fan, first go to a status screen of any fan and then:
•
Disconnect from the RS485 network the fan who needs replacing and wait for the MDC to display this
fan's status screen showing that the fan lost its communication
•
Connect the new fan to the RS485 network
•
Switch the new fan on
•
Wait for the MDC to identify the new fan – a new screen should appear see H4 – Fan Replacement
•
Press ENTER button to add the new fan to the array
6.0
Fault Indication
The fault indication system has been prioritised as per the following:
•
Loss of Modbus communication between controller and fans – High Priority
•
Fan Alarms – Medium Priority
•
Fan Warnings – Low Priority
6.1 Loss of communication and fan alarms
When a fan is being monitored and any fan in the array losses its Modbus communication with the controller, the
controller will switch on the red LED and jump to that fan status screen. The same applies if a fan has an alarm.
However, if another loss of communication or fan alarm is triggered from a different fan in the array, the MDC will
jump to that different fan status screen, so it always displays the most recent fan experiencing a loss of
communication or fan alarm. Figures 19 and 20 below show a fan that lost its communication and a fan with a single
alarm:
Red
LED on
If a fan has more than one alarm, they will be displayed in a list as they occur, and the alarm counter will increment.
The LCD can display up to 3 fan alarms per fan.
In the event of a fan switching off or losing its communication due to one or more alarms, the alarms will (in most
cases) be logged inside that fan's MDC dedicated Holding Register. See Appendix C – Remote Monitoring &
Control for more details.
210-OMI14229-Iss2
© ebm-papst UK Ltd 2018
Figure 19 - Communication Lost
Operation & Maintenance Instructions
Chelmsford Business Park Chelmsford Essex CM2 5EZ
Telephone: +44(0)1245468555 Fax: +44(0)1245466336
e-mail
sales@uk.ebmpapst.com
Figure 20 - Fan Alarm
Alarm Counter
Space
reserved for
extra alarms
Page 23 of 45
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