Nebula Specification

System
ARM processor 16Mb of Flash Memory
Optional Compact Flash Expansion
Real Time Clock
Accuracy 2ppm TCXO
Synchronisation Sync input pulse, NTP server, GPS
Data Ports
Ethernet 10/100 - TX
GRDO V24/RS232
OMDO V24/RS232
Comms-Out 20mA bi-directional current loop active
Comms-In 20mA bi-directional current loop passive
Modem PSTN
Meter Inputs
Pulse Channels 16 or 32 inputs (contact closure)
Data Channels 4 or 8 RS 485 inputs
Frequency Inputs
Number 2
Type Isolated 50Hz grid frequency
Input Voltage 50-132 VRMS
Outputs
Watchdog Relay Two changeover contacts
(rated: 100VDC, 1A)
Analogue 16 channels (4 - 20mA)
16 channels (± 10mA)
Supply Input
Nominal
Voltage range
48VDC or 110VDC (AC options on request)
Input current 42 to 137.5VDC
150mA (48VDC)
Fuse rating 60mA (110VDC)
500mA (mounted on PSU)
Enviroment 
Temperature +5°C to +55°C
Humidity 10% to 95% non-condensing
to NGTS 2.9, 2.13
Electrical
Conducted Emissions EN55022 Class A
Radiated Emissions EN55022 Class A
Electrostatic Discharge EN61000-4-2 15kV Air 8kV Contact
Radiated Immunity EN61000-4-3 10V/M 80% AM
Electrical Fast Transients EN61000-4-4 4kV Supply Inputs
Watchdog Alarm
Comms In/Out
Frequency Inputs
2kV Meter Inputs
GRDO/OMDO Outputs
Analogue Outputs
Surge EN61000-4-5 2kV Supply Inputs
Watchdog Alarm
Comms In/Out
Frequency Inputs
1kV Meter Inputs
GRDO/OMDO Outputs
Analogue Outputs
Conducted Disturbances EN61000-4-6 10V RMS 150kHz - 100MHz
Magnetic Immunity EN61000-4-8 30 A/m
Damped Oscillatory Wave EN61000-4-12 2.5kV CM / 1kV DM
Supply Inputs
Watchdog Alarm
Comms In/Out
Frequency Inputs
Mechanical
Mounting Standard 19 inch rack mounting (IEC 60297-1)
Panel height 2 U (3½ inches) or 4 U (7 inches)
Depth 13 inches plus sockets 
Protocols
  IEC 62056-21
  COSEM HDLC DLMS
  MODBUS
  IEC 61850


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