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Modbus & Serial
Output Transmitter
for AC Phase Angle Input
Transmits
angular phase offset in degrees
of AC waveforms.
DIN Rail mounted, digitally
programmable.
Standard Features
- Selectable Modbus or
Laurel ASCII protocol
- Modbus RTU or ASCII modes,
2-wire connection, up to 247 digital addresses
- Compliant with Laurel ASCII protocol (selectable)
- Transmits phase angle between two AC wave shapes of similar
period
- Frequency from .005 Hz to 10 kHz
- Resolution of 1º, 0.1º or 0.01º
- 0.01% accuracy at AC line frequency
- Converts phase input to six-digit
reading:
- Digital span adjust from 0 to ±999,999
- Digital zero adjust from -999,999 to
+999,999
- Inputs from NPN or PNP proximity switches, contact
closures, digital logic, magnetic pickups down to 12 mV, or AC inputs up to 250 Vac
- Triggers on positive or negative pulse
edges
- DIN rail mount package only 22.5 mm thick
- Plug-in screw-clamp connectors
- Easy setup with PC-based
Instrument Setup Software
- 5V, 10V or 24V dc sensor excitation
output, isolated
- Dual solid state relays for alarm or control, isolated
- RS232 or RS485 serial communications, isolated
- Universal AC power, 85-264 Vac
- Priced at only $275 (basic phase angle
transmitter)
Options:
- Low voltage power, 10-48 Vdc or 12-32 Vac
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The Laureate
Modbus & serial output phase angle transmitter
transmits the lead or lag in degrees from 0º
to 360º between two periodic signals of the same period. In the illustration
to the right,
phase angle is 360*P1/P. The signals are applied to the Channel A and B inputs
of the Laureate dual-channel pulse input signal conditioner board.
A resolution of 1º, 0.1º or 0.01º is selectable. Accuracy is 0.01% up to 100
Hz, 0.1% at 1 kHz, and 1% at 10 kHz. |
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 Phase angle is determined by timing crystal
clock pulses over a specified gate time which is selectable from 10 ms to 199.99 s. By
selecting the minimum gate time of 10 ms, the update rate can be up to 20/s for 50/60 Hz
AC line frequency. Improved accuracy is obtained by making the gate time long enough so
that multiple cycles can be averaged.Exceptional Accuracy and
Stability.
Laureate pulse
input frequency and rate transmitters determine
frequency by taking the inverse of period as measured with a calibrated
quartz crystal time base. This results in extremely accurate and stable
6-digit internal readings (±999,999 counts), which are then processed in
software. The update rate of the transmitter output is a programmed gate time + 30 ms + 0-2 signal periods. For a
60 Hz signal, the update rate would be 20 per second. Such fast update rates
are ideal for alarm and control.
LTM Series serial
output transmitters send data via an isolated serial port, which is user
configurable for RS232 or RS485 and full or half duplex operation. Three
protocols are user selectable: Modbus RTU, Modbus ASCII, or Laurel ASCII. Modbus operation
is fully compliant with Modbus Over Serial Line Specification V1.0 (2002).
The Laurel ASCII
protocol allows up to 31 Laureate devices to be addressed on the
same RS485 data line. It is simpler than the Modbus protocol and is
recommended when all devices are Laureates. It also allows use of
Laurel Datalogging Software.
Standard features of Laureate transmitters include:
- Serial data output, isolated. User selectable RS232 or RS485, half or full duplex, Modbus or
Laurel ASCII protocol.
- Dual solid state relays for control or alarm, isolated.
Rated 120 mA at 130 Vac or 170 Vdc.
- Transducer excitation output, isolated. User selectable 5V@100 mA, 10V@120 mA or 24V@50
mA.
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Analog transmitter output, 16-bit, user scalable and isolated. User selectable 4-20 mA,
0-20 mA or 0-10V levels.
- Universal AC power supply for 85-264 Vac.
Easy Transmitter programming is via
Laurel's Instrument Setup Software,
which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from
Laurel (P/N CBL04).
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Specifications
Laureate Modbus & Serial Output Transmitter
for AC Phase Angle Input
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Phase
Angle Operation |
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Item Transmitted
Digital Resolution
Transmitted Units
Frequency Range
Accuracy
Maximum Timing Interval |
Phase
angle difference between two waves of same period
6 digits
1°, 0.1°, 0.01°
0.005 Hz to 10 kHz
0.01°, 0.005 Hz to 100 Hz; 0.1° at 1 kHz, 1° at 10 kHz
200 s |
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Inputs |
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Types
Signal ground
Minimum Signal
Maximum Signal
Noise Filter
Contact Debounce |
AC,
pulses from NPN, PNP transistors, contact closures,
magnetic pickups
Common ground for channels A & B
Nine ranges from (-12 to +12 mV) to (+1.25 to +2.1V)
250 Vac
1 MHz, 30 kHz, 250 Hz (selectable)
0, 3, 50 ms (selectable) |
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Update Rate |
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Conversion
Interval
Gate Time
Time Before Zero Output |
Gate
time + 30 ms + 0-2 signal periods
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s |
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Serial Data Output
(standard) |
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Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS-485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance |
RS232 or RS485 (half duplex)
300, 600, 1200, 2400, 4800, 9600, 19200 baud
250V rms working, 2.3 kV rms per 1 min test
Modbus RTU, Modbus ASCII, Laurel ASCII (selectable)
32 max without a repeater.
247 max
RTU or ASCII, 2-wire.
Modbus over Serial Line Specification V1.0 (2002) |
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Transducer Excitation Output (standard) |
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Output Levels
Output Isolation |
5V@100 mA, 10 @120 mA, 24V@50 mA (jumper
selectable)
50V from signal ground |
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Dual Relay Output (standard) |
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Relay Type
Load Rating |
Two solid state relays, SPST, normally open,
Form A
120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance |
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Analog Output (standard) |
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Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation |
4-20 mA, 0-20 mA, 0-10 Vdc (jumper selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load or higher)
16 bits (65,536 steps)
0.02% of output span plus conversion accuracy
250V rms working, 2.3 kV rms per 1 minute test |
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Power Input |
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Standard Power
Low Power Option
Power Frequency
Power Isolation
Power Consumption |
85-264 Vac or 90-300 Vdc (DC operation not UL
approved)
10-48 Vdc or 12-32 Vac
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test
2W typical, 3W with max excitation output |
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Mechanical |
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Dimensions
Mounting
Electrical Connections |
120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Plug-in screw-clamp connectors |
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Environmental |
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Operating Temperature
Storage Temperature
Relative Humidity
Cooling Required |
0°C
to 55°C
-40°C to 85°C
95% at 40°C, non-condensing
Mount transmitters with ventilation holes at top and bottom.
Leave 6 mm (1/4") between transmitters, or force air with a fan. |
Using Laureate Meters, Counters and Transmitters to Synchronize Motor Generators |
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Synchronization of two motor generators
requires that the two frequencies be identical, that the lines be in phase, and that the
line voltages be close to each other. In this illustration, a single Laureate dual channel
counter (or frequency transmitter) measures both frequencies to six-figure accuracy in a few line cycles. Another
Laureate dual channel counter (or phase transmitter) measures phase angle to 0.1º resolution. Two Laureate AC
RMS Voltmeters, which offer ranges of 200.00 V and 600.0 V, are used to display the two RMS voltage to 0.1% accuracy.
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Pinout
Laureate Modbus & Serial Output Transmitter
for AC Phase Angle Input
Ordering
Guide
Laureate Modbus & Serial Output Transmitter
for AC Phase Angle Input
Click on the radio buttons to build a model number with pricing (shown below the Ordering Guide).
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