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Operating and Maintenance Instructions
5.0
Operating Modes
5.1 General
The MDC can be configured to operate in four different modes:
•
Monitor (factory set to this mode)
•
Monitor & Control
•
Constant Volume / Constant Pressure
Modbus Relay
•
In "Monitor" and "Modbus Relay" modes the fans remain in their factory default settings. In "Monitor & Control" and
"Constant Volume / Constant Pressure" modes the MDC automatically changes the settings of each fan to allow
speed control via Modbus opposed to the factory settings of 0-10V analogue input control and therefore the
analogue inputs of the fan motors are disabled. There is no need to manually change individual fan settings, the
MDC does this automatically.
In addition to changing the operational mode of the MDC, it is also possible to change different parameters of the
fans and the controller such as RPM limits, Control Voltage Cap, Input Voltage Cap, Alarm Output, BMS Settings,
LCD Brightness, Main Menu lock as well as to reset the fans and controllers to their factory default condition.
5.2 Accessing the main menu
Modifying the operational mode and configuring the control parameters is available via the Main Menu, which can
be accessed using the keypad see H6 – Status. Scroll though the fans using the BACK button until Fan 1 status
screen is shown. Pressing the BACK button twice again accesses the Main Menu. It is possible to prevent
unauthorised access to the main menu by locking it. Details on activating the lock and the key sequence to allow
Main Menu access is detailed on 5.7 Advanced Settings Submenu
Most of the options in the Main Menu and its submenus can also be modified remotely by a Modbus Master
connected to the MDC's RS485 slave port. See Appendix E – Modbus Holding Registers for more details.
The Main Menu is intended for configuration purposes only and therefore the entire controller's monitor and/or
control operations will be halted whilst on the Main Menu or any of its submenus except 'Set Speed' submenu.
Halting does not apply if the configuration parameters are changed via the RS485 slave port whilst the MDC is
in a status or power screen, however, most changes made in the Main Menu either locally or remotely will
trigger a power cycle to both fans and controller in order to activate the new parameters.
The four operational modes are selectable in the Main Menu using menu option 'Operation Mode'. Please note
that all fans must have been addressed for this option to become available.
5.3 Monitor mode (default operation)
In "Monitor" operating mode the fans in the array are following a speed control command from a separate source,
for example a 0-10VDC or 4-20mA control, or if they have been configured to adapt based on a sensor input to the
fan. In this operating mode, the MDC is just a monitoring device extracting information from the Modbus registers
in each fan.
In "Monitor" operating mode it is also possible to monitor either a pressure differential or calculate the volume flow
in real-time by using an external DS85 differential pressure sensor connected to the MDC. This information will be
displayed in the Power Meter screen. See H7 – Operation Mode – Monitor for how to enter Monitor mode.
210-OMI14229-Iss2
© ebm-papst UK Ltd 2018
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
Page 13 of 45
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