Siemens MD-BMED, User Manual, Page: 14 / 122

Introduction
Safety Summary and Specifications
14
Building Technologies
125-202
06/06/2017
MD-BMS and MD-BMED Technical Specifications
Specification Description
Service Types Single Phase, Three Phase-Four Wire (WYE), Three Phase-Three Wire
(Delta)
3 Voltage Channels 80 to 346 Volts AC Line-to-Neutral, 600V Line-to-Line, CAT III
Current Channels 3 channels, 0.525 Vac maximum, 333 mV CTs to maintain accuracy.
Measure up to 4000 Amps depending on the current transducer.
Maximum Current Input 158% of current transducer rating (mV CTs) to maintain accuracy.
Measure up to 4000 Amps for Rogowski Coil CTs.
Measurement Type True RMS using high-speed digital signal processing (DSP)
Line Frequency 50/60 Hz
Power From L1 Phase to L2 Phase. 80 to 600 Vac CAT III 50/60 Hz
90 mA maximum. Non-user replaceable 0.5 Amp internal fuse protection.
Waveform Sampling 12 kHz for voltage or current
Parameter Update Rate 0.5 seconds
Measurements Volts, Amps, kW, kWh, kVA, kVAR, kVARh, kVAh, Apparent Power
Factor (aPF), Displacement Power Factor (dPF). All parameters for each
phase and for system total.
Accuracy Rated to ANSI C12-20-2010 Class 0.2. Better than 0.2% (<0.1% typical)
for V, A, kW, kVAR, kVA, and PF, excluding sensor.
Resolution 0.01 Amp, 0.1 Volt, 0.01 watt, 0.01 VAR, 0.01 VA, 0.01 Power Factor
depending on scalar setting.
LED Indicators Bi-color LEDs (red and green): 1 LED to indicate communication, 3 LEDs
for correct phasing: Green when voltage and current are on the same
phase; Red when incorrectly wired. Pulse output LED.
Pulse Output Open Collector, 5 mA maximum current, 30V maximum open voltage,
optically isolated.
Communication
Direct RS845: BACnet MS/TP protocol (default) or Modbus RTU
Ethernet: BACnet IP protocol (default) or Modbus TCP (MD-BMED only)
Maximum Distance
Communication Length
RS845: 1200 meters with data range of 100K bits/second of less.
Ethernet: <30 meters for CAT5 cable; use 600V rated cable (indoor
wiring only).
Baud Rate BACnet: 9600, 19200, 38400, 76800 (default)
Modbus: 9600 (default), 19200, 38400, 57600, 76800, 115200
Data Bits 8
Parity None, Even, Odd
Stop Bit 2, 1