Operating Instructions

6 Siemens Industry, Inc.
Introduction
There are four meters in the MD-xxHD Series: the MD-3HD, MD-12HD, MD-24HD and the MD-48HD.
These meters monitor the voltage, current, power, energy, and many other electrical parameters on
single and three-phase electrical systems. A MD-xxHD meter uses direct connections to each phase of
the voltage and current transformers to monitor each phase of the current. Information on energy use,
demand, power factor, line frequency, and more are derived from these voltage and current inputs.
The MD-xxHD meter is not meant to be a standalone energy recorder; rather it is connected as a slave
device to a data logger, Remote Terminal Unit (RTU), or Building Management host network. The
MD-xxHD meter communication interfaces include Ethernet (LAN) or RS-485 serial. BACnet MS/TP and
Modbus RTU are the two communication protocols that operate over an RS-485 serial network and
BACnet IP and Modbus TCP are supported over Ethernet. A USB port is also provided as the preferred
connection for on-site configuration and can be run concurrently with an RTU.
Unpacking the Unit
The MD-xxHD can be ordered with optional product features which are identifiable on the part number
label.
MD-xxHD Part Numbering Scheme.
Each MD-xxHD meter shipment also includes the following items:
▪ Meter with Options Installed – Serial Number, MAC ID, and FCC ID indicated on side label.
▪ Pluggable Connectors:
o MD-48HD (2 voltage, 50 three-position terminals, 3 two-position terminals)
o MD-24HD (2 voltage, 26 three-position terminals, 2 two-position terminals)
o MD-12HD (1 voltage, 14 three-position terminals, 5 two-position terminals)
o MD-3HD (1 voltage, 4 three-position terminals, 1 two-position terminal)
▪ Thumb drive containing ViewPoint HD Software, Register List, Manual, Tutorial Videos