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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. One port, the master RS485, communicates with ebm-papst
Modbus enabled, electronically commutated fans with software version 5.0 or later using a two-wire plus ground
RS485 connection. The second port, the slave RS485, communicates with a higher level third-party system such
as a Building Management Systems (BMS), providing real-time monitoring and control data.
The master port can search, address, and talk to up to 100 fans connected to its network.
The MDC provides an auto-addressing facility to ease installation and commissioning, and supports four different
operating modes as explained below:
•
Monitor operating mode
o Monitors pre-defined parameters and reports the information via the digital display and the RS485
slave port, see Tables 1 and 2 below
o A fault condition will be raised by an on-board LED and a volt-free relay
o An optional DS85 differential pressure sensor can provide a signal to display either differential
pressure or used by the MDC to calculate and display volume flow
•
Monitor & Control operating mode
o As per Monitor operating mode plus the fan speed is controlled by one, or a combination of:
o An optional DS85 pressure sensor can provide a signal to display either differential pressure or
used by the MDC to calculate and display volume flow
•
Constant Volume / Constant Pressure Control operating mode
o As per Monitor operating mode but requires an external DS85 differential pressure sensor used
by the MDC to maintain a constant volume / constant pressure. The constant volume / constant
pressure setpoint can be entered via the keypad or via the RS485 slave port
•
Modbus Relay operating mode
o The MDC stops getting information from the fans and/or setting the fan array speed and becomes
a messenger between the fans and a third-party Modbus master system thus allowing direct
access to all Modbus registers on each fan and individual speed control for each fan.
The MDC will display the following parameters from each connected fan (except during Modbus Relay operation):
Actual Speed (RPM)
Motor Temperature (
Fan Power Consumption (W)
The MDC will also display the following parameters from the fan array:
Note *
- The controller is compatible with all firmware versions of ebm-papst enabled Modbus EC fans
1
version 5.0 and later, however, on 'Modbus LITE' reduced functionality fans, the parameter 'Motor
Temperature' will be displayed as "N/A".
Note *
- Volume and pressure (either metric or imperial) is only available using an external differential
2
pressure sensor type DS85, models 50 Pa up to 2000 Pa
210-OMI14229-Iss2
© ebm-papst UK Ltd 2018
0-10V control signal input to the MDC
▪
Third-party Modbus master system connected to the RS485 slave port of the MDC
▪
Local control using the MDC keypad
▪
C) *
Electronics Temperature (
o
1
Table 1 - Information shown on the MDC display for a single fan
Total Power Consumption (kW)
Table 2 - Information shown on the MDC display for the fan array
Operation & Maintenance Instructions
Chelmsford Business Park Chelmsford Essex CM2 5EZ
Telephone: +44(0)1245468555 Fax: +44(0)1245466336
e-mail
sales@uk.ebmpapst.com
Set Point (%)
C)
o
Fan Warnings
Volume (m
/h or CFM) or
3
Pressure (Pa or INWG) *
Fan Serial Number
Hours Run (h)
2
Page 6 of 45
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