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Operating and Maintenance Instructions
When a "sensor fail" alarm occurs, the controller will switch its red LED on and display one of the following screens:
If a fan is directly connected to a sensor, the volume/pressure reading will be replaced with a "Sensor Fail" text. On
the other hand, if the fan is not directly connected to a sensor but shares an inlet ring connection with a failed
sensor, the character "F" will appear next to the sensor number indicating that that sensor has failed. When the
system has two or more sensors and one fails, the fans that are connected to the failed sensor will be given
individual volume/pressure readings based on the average individual volume/pressure readings of the other fans
that are connected to healthy sensors. That is the case of fans 1 and 2 above: while fan 1 must display the "sensor
fail" alarm text, fan 2 displays the "assumed" volume reading which is the same value given to fan 1.
10.0 Replacing the Controller
If the controller unit becomes faulty and needs to be replaced, ensure that the new controller is at its factory default
settings before connecting it to the fan network. Select "Fan Addressing" and "Existing Fan Array". Wait for the
verification to finish and then either proceed with the suggested number of fans, or manually select the number of
fans in the array using the UP and DOWN buttons. Finally, confirm by pressing the ENTER button - the controller
will then power cycle and display the status screen of Fan 1.
Note 1: The new controller will not identify any set points or configuration parameters from its predecessor
other than the fan speed control method e.g. Analogue 0-10V or RS485 because that is stored in the fans.
Note 2: The new controller must be manually re-configured to fully match its predecessor settings such as
11.0 Replacing a Fan
The controller allows a single fan in the array to be replaced at a time. When replacing a fan, go to any fan's status
screen and then, if the fan to be replaced is still operating:
•
Disconnect the fan to be replaced from the RS485 network and wait for the controller to display this fan's
status screen showing a "No Comms" alarm.
•
Replace the fan and connect the new fan to the RS485 network.
•
Switch the new fan ON.
•
Wait for the controller to identify the new fan – a new screen should appear, see H4 – Fan Replacement.
Press the ENTER button to add the new fan to the array: this will cause the controller to assign the same
•
Modbus Address as its predecessor as well as the correct Speed Control method depending on the
controller's operating mode.
Important: The replacement fan must be at Modbus Slave Address 1 and have the same Modbus Port
Configuration as the controller. To check the controller's Modbus Port Configuration, go to "Advanced Settings
-> Fan Comms -> MDC Comms". In case of differences, the fan must be manually set to the required
configuration using an external system such as a combination of computer/laptop + USB to RS485 converter +
210-OMI14229-Iss8.1
© ebm-papst UK Ltd 2021
Figure 27 – Sensor Fail Alarm Indication
Operating Mode, Alarm Mode, BMS Settings, etc.
EC Control software.
CN1116 Full OMI
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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