Laurel Electronics LTE: Ethernet & 4-20 mA Output Transmitter for AC RMS Voltage or Current - Manual

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 1
LAUREL
ELECTRONICS, INC.
Ethernet & 4-20 mA Output Transmitter
for AC RMS Voltage or Current
Standard Features
• Ethernet serial data I/O, Modbus TCP or Laurel ASCII protocol
• 4-20 mA or 0-10V transmitter output, 16 bits, jumper selectable, isolated
• Dual 120 mA solid state relays for alarm or control, isolated
• True AC RMS measurement in one 50/60 Hz AC line cycle
• 0.2, 2, 20, 200, 300V and 600V AC voltage ranges
• 2, 20, 200 mA and 5A AC current ranges
• All input ranges user-selectable and factory calibrated
• AC or DC coupling for signals from DC to 10 kHz
• 0.1% accuracy of full scale, 0% to 100% of full scale, 3.0 crest factor
• Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power
• Power over Ethernet (PoE) jumper selectable with 10-48 Vdc supply
Description
The Laureate AC RMS input transmitter & signal conditioner
provides six voltage input ranges and four current input ranges,
all factory calibrated and jumper selectable. A special 5.000A
range utilizes a built-in 0.01Ω shunt to accept the output of 5A
current transformers, with no need for a stepdown transformer.
The current readings can easily be scaled digitally as needed.
True RMS precision circuitry is used to determine the root-
mean-square of complex waveforms from DC to 10 kHz. Spikes
up to 3.0 times the maximum of each range are accurately
measured.
Accuracy is 0.1% of full scale* for signals from DC to 10 kHz
and signal amplitude down to 0. The crest factor (Vp / Vrms) is
3.0 at full scale, increasing to 300 for a signal amplitude of 1% of
full scale.
True RMS readings in as little as one 50/60 Hz AC line cycle
are unmatched in the industry. Such a high read rate allows
anomalies to be detected and alarmed before they become
expensive problems. On/off control and alarm can be achieved
dual solid state relays, which are standard. Transmitter can also
capture peak and valley for times as short as one 50/60 Hz AC
power line cycle.
AC or DC coupling is jumper selectable. AC coupling accom-
modates signals from 10 Hz to 10 kHz for applications such as
measuring the ripple on a DC power supply. DC coupling accom-
modates signals from 0 Hz to 10 kHz. Multiple integral cycles are
averaged for signals above 50/60 Hz. A single cycle is captured
for signals from 3 Hz to 50/60 Hz. Below 3 Hz and at DC, the
capture rate is every 333 ms.
Standard features of Laureate LTE transmitters include:
• Ethernet I/O, isolated. Supported protocols are Modbus
RTU and ASCII (tunneled via Modbus TCP) and Laurel ASCII.
The latter is simpler than the Modbus protocol and is recom-
mended when all devices are Laureates. Note that RS232 or
RS485 data I/O in lieu of Ethernet is provided by LT Series
transmitters.
• 4-20 mA, 0-20 mA or 0-10V analog transmitter output,
isolated, jumper-selectable and user scalable. All selections
provide 16-bit (0.0015%) resolution of output span and 0.02%
output accuracy of a reading from -99,999 to +99,999 counts
that is also transmitted digitally. Output isolation from signal
and power grounds eliminates potential ground loop problems.
The supply can drive 20 mA into a 500 ohm (or lower) load for
10V compliance, or 10V into a 5K ohm (or higher) load for 2
mA compliance.
• Dual solid state relays, isolated. Available for local alarm or
control. Rated 120 mA at 130 Vac or 180 Vdc.
• Universal 85-264 Vac power. Low-voltage 10-48 Vdc or 12-
32 Vac power is optional.
Discovery and configuration of Laureate Ethernet Nodes is
easily achieved with Laurel's Node Manager Software, and the
discovered transmitters can then be programmed using Laurel's
Instrument Setup Software. Both softwares run on a PC under
MS Windows and can be downloaded at no charge.