SATEC EM920 Installation Manual - Manual (Page 8)

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Chapter 1 Introduction
• Auxiliary power supply option – AC/DC and Low DC options are available
• High resolution 4’ Graphic LCD display
• Four slots for option modules
AC/DC Inputs
• Three AC voltage inputs - up to 480VAC direct line-to-line input voltage, for feeding and
measurement; high impedance input (>10MΩ)
• Four AC voltage inputs - up to 2KV peak direct line-to-ground and neutral-to-ground input
voltage
• Three standard isolated AC current inputs (FORM 9) and optional fourth current input, 5A
nominal input currents and up to 50 A fault overload current
• Optional isolated AC/DC power supply input – up to 4KV AC insulation withstanding
• Optional isolated low DC power supply input – up to 4KV AC insulation withstanding
Input/Outputs
The EM920 is equipped with two fast digital inputs (DI), in the basic instrument, eight digital
inputs (8DI module) and six digital outputs (6RO module) optional modules
• DI (basic) – 2 Digital inputs – optically isolated input; dry contact, programmable de-
bounce time from 1 ms to 1 sec; free linkage to Sequence-of-Events Recorder, Fault
Recorder, control setpoints, pulse counters for Energy/TOU subsystem)
• 8DI (optional module)– 8 Digital inputs – optically isolated input; dry contact,
programmable sampling rate from ½ cycle to 1 sec; control setpoints, pulse counters for
Energy/TOU subsystem)
• KYZ relay output (basic)
• 6RO (optional module) – 2 relay types: 2 x Electromechanic Relays – EMR FORM A and 4 x
Solid State Relays – SSR Form C, unlatched, latched and pulse operations, failsafe
operation for alarm notifications; programmable pulse width; direct remote relay control
through communications
• 4AO (optional module), 4 Analog Outputs with 5 basic current options (0-20mA, 4-20mA,
0-1mA and ± 1mA)
• TRM (optional module), analyzing transient voltage between phase and ground, up to 2 kV
and sampling rate up to 1024 samples per cycle
Communications
The EM920 has extensive communications capabilities:
• On-board Infrared port, isolated RS-485 port and USB Device port (MODBUS RTU/ASCII
and DNP3.0 protocols)
• ETH (optional module), including:
− Versatile RS-232/485 universal serial communications port (up to 115,200 bps,
MODBUS RTU/ASCII and DNP3.0 protocols)
− Ethernet 10/100 Base-T port (MODBUS/TCP or DNP3.0/TCP protocols, up to five non-
intrusive simultaneous connections, Telnet service port)
− 1-ms satellite-synchronized clock - IRIG-B format time-code input
• Cellular GPRS modem (MODBUS/TCP or DNP3.0/TCP protocols)
Upgradeable Firmware
The EM920 uses flash memory for storing device firmware that allows future upgrading of the
device without replacing any hardware component. The new features can be easily added to
your device by simply replacing the firmware through a local RS-232/RS-485, USB port or
Ethernet port.