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Operating and Maintenance Instructions
2.0
Introduction
The Modbus Display & Control (MDC) is a device with two RS485 ports, a keypad for setting parameters and a
display to view the status of the connected equipment. The RS485 master port communicates with ebm-papst
Modbus enabled, Electronically Commutated (EC) fans with software version 5.0 or later using a two-wire plus
ground RS485 connection. The RS485 slave port communicates with an external Modbus Master device e.g.
Building Management System (BMS) and provide real-time monitoring and control data.
The MDC features a Modbus auto-addressing program to ease installation and commissioning where it
automatically searches and addresses up to 100 EC fans connected to its RS485 master port.
Four different operating modes are supported:
•
Monitor:
o Monitors pre-defined fan parameters and reports the information via the digital display and the
RS485 slave port (see Tables 1 below).
o A fault condition is raised by an on-board LED and a volt-free relay.
o An optional 0-10V differential pressure sensor can provide a signal to the controller to display
either differential pressure or used to calculate and display volume flow.
•
Monitor & Control:
o As per Monitor operating mode plus the fan speed is controlled by one, or a combination of:
•
Constant Volume / Constant Pressure:
o As per Monitor operating mode but requires one or multiple 0-10V differential pressure sensors
used by the controller to maintain a constant volume / constant pressure setpoint configured via
the keypad and/or the RS485 slave port.
•
Modbus Relay:
o This operating mode converts the controller into a simple messenger where it relays all Modbus
information received from the RS485 slave port to the master port, enabling individual fan control
and access to all Modbus Registers of each fan.
The MDC will display the following parameters for each connected fan, and the following system parameters:
Fan Actual Speed (RPM)
Fan Motor Temperature (
Fan Power Consumption (W)
Fan Air Volume (m
3
Air Pressure (Pa or in.w.g) *
Note *
- The controller is compatible with all firmware versions of ebm-papst enabled Modbus EC fans version
1
5.0 and later, however, on 'Modbus LITE' reduced functionality fans, the parameter 'Motor Temperature' is not
available.
Note *
Volume and pressure measurements require one or more external differential pressure sensors with
2 -
a 0-10V output. The supported pressure ranges are 50Pa, 200Pa, 500Pa, 1000Pa, 2000Pa and 3500Pa.
210-OMI14229-Iss8.1
© ebm-papst UK Ltd 2021
▪
An external 0-10V control signal connected to the controller's 0-10V input.
A third-party Modbus Master device connected to the controller's RS485 slave port.
▪
Local control using the controller's keypad.
▪
C) *
Fan Electronics Temperature (
o
1
/h or CFM) or Fan
System Power Consumption (kW)
2
Table 1 - Information shown on the MDC
Chelmsford Business Park Chelmsford Essex CM2 5EZ
Telephone: +44(0)1245468555 Fax: +44(0)1245466336
e-mail
sales@uk.ebmpapst.com
Fan Set Point (%)
Fan Warnings
CN1116 Full OMI
Fan Serial Number
C)
Fan Hours Run (h)
o
Fan Alarms
Total System Volume (m
CFM) or Total System Pressure
(Pa or in.w.g) *
/h or
3
2
Page 6 of 47
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