Siemens MD-12HD, User Manual, Page: 73 / 74

Siemens Industry, Inc. 72
Appendix D
— MD-xxHD Technical Specifications
Specification Description
Service Types Single Phase, Split Phase, Three Phase-Four Wire (WYE), Three Phase-Three
Wire (Delta)
Voltage Channels 90-346 Volts AC Line-to-Neutral, 600V Line-to-Line, CAT III.
Two voltage reference inputs (MD-48HD only)
Current Channels 12 (MD-12HD) or 48 (MD-48HD) channels, 0.525 VAC max, 333 mV CTs, 0-4,000
Amps depending on current transducer
Maximum Current Input 150% of current transducer rating (mV CTs) to maintain accuracy. Measure up to
400
0A with RōCoil CTs.
Measurement Type True RMS using high-speed digital signal processing (DSP) with continuous
sampling
Line Frequency 50-60 Hz (45
– 70 Hz measureable range) – measurement taken L1-N
Power From L1 Phase to L2 Phase. 90-600VAC RMS CAT III 50/60Hz, 500mA AC Max
Use of 12 volt auxiliary output requires 100 VAC minimum input voltage.
AC Protection 0.5A Fuse 200kA interrupt capacity
Power Out Unregulated 12VDC output, 200 mA, self-resetting fuse
Waveform Sampling 1.8 kHz (MD-48HD), 3.6 HZ (MD-12HD)
Parameter Update Rate 1 second
Interval Data Recording Energy (kWh) values are recorded every 15 minutes for 63 days (downloadable
log)
Each record is time stamped.
Measurements Volts, Amps, kW, kVAR, kVA, aPF, dPF, kW demand, kVA demand, Import
(Received) kWh, Export (Delivered) kWh, Net kWh, Import (Received) kVAh,
Export (Delivered) kVAh, Net kVAh, Import (Received) kVARh, Export (Delivered)
kVARh, Net kVARh, THD, Theta, Frequency. All parameters for each phase and
system total.
Accuracy 0.2% ANSI C12.20-2010 Class 0.2
Resolution Values reported in IEEE-754 single precision floating point format (32 bit)
Indicators Optional 4-line display, tri-
color backlight (PhaseChek™)
Alarm Output Over/Under Voltage and Current (SPDT Relay - 30 Vdc)
Pulse Inputs MD-12HD
– 4 inputs
MD-48HD
– 2 inputs **
3.3V sourcing voltage (current limited) to customer dry contact pulse output
Maximum Pulse Rate 10 HZ (50 msec minimum transition time)
** Available Q4 2018
Communication
Hardware RS-485, Ethernet, & USB (for configuration only)
Supported Protocols Modbus RTU or BACnet Master Slave Token Passing protocol (MS/TP)
Modbus (using SunSpec IEEE-754 single precision floating point model)
Max Communication
Length 1200 meters with Data Range of 100K bits/second or less
RS-485 Loading 1/8 unit