BES MDU12i, Modular Unit

Page: 5 / 41

DOC32 Page 5 of 41 Issue 2 30 NOV 17
1.0 Description
The DEM Intelligent Mains Distribution Unit [iMDU] is a meter grade 12 outlet power
distribution product housed within a 1U 19” sub-rack.
The main function of the product is to distribute a single phase mains power supply to 12
socket outlets while monitoring voltage, current, power and energy usage to a
meter grade accuracy of ± 1%. Additionally the product can monitor external environmental
conditions, temperature or humidity, contact inputs, 0-5VDC analogue inputs and control
voltage free contact outputs. The product is controlled remotely over an Ethernet network
using the integrated web server, SNMP registers or Telnet command interface. The product
provides the following features:

Single phase 16A capable ± 1% accuracy metering.

Monitoring of VRMS, IRMS, kW, kWh, Power factor, kVA, kgCO2, BTU/h, kJ/h and
frequency measurements.

Ethernet port [IEEE 802.3 with full 10/100Base-T network compatibility].

High-speed MODBUS RS485 port for local daisy-chaining of up to 31 iMDU slaves.

Temperature sensor bus [8x chained] + Humidity/Temperature sensor port.

External GPIO contact monitoring inputs x8.

External GPIO 0-5VDC analogue inputs x2.

External GPIO voltage free N.O. 1A @ 48VAC/DC relay output x2.

12 socket outlets with 16A N.O. switching and fuse blown monitoring.

USB Type ‘A’ port with 1A @ 5VDC power output.

Remote monitoring and configuration [HTML webserver, SNMP registers and Telnet
command interface].
Physical layout
The product is enclosed within a 1U 19” sub-rack with a mains inlet/outlet, illuminated front
panel mounted isolator switch, 12x IEC outlets and main interface connectors on the rear
panel and USB port, 12x fuses and power/fuse blown LED indication on the front panel.
The product is made up of a ‘Control’ PCB assembly which consists of a front panel
removable processor and mains power supply PCB that plugs into (hot swappable) a fixed
rear mounted meter and interface PCB.