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AC Phase Angle Input
Modbus
or Laurel ASCII Protocol Serial I/O Transmitter
For angular phase offset in degrees
of AC waveforms.
DIN Rail mounted, digitally
programmable.
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 waveshapes of similar
period.
- Frequency from .005 Hz to 10 kHz.
- Resolution of 1º, 0.1º or 0.01º.
- .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.
- 5V, 10V or 15 V dc excitation
output to power sensors.
- DIN rail mount package only 22.5 mm thick.
- Detachable screw clamp plug connectors.
- Easy setup using PC-based
Instrument Setup Software.
- Optional dual solid state relays for alarm or control.
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The serial output of
Laureate AC phase angle transmitter
indicates the lead or lag in degrees from 0º
to 360º between two periodic signals having the same period. In the illustration
to the left,
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.
Phase angle measurement is commonly used with
AC power from 50 Hz to 400 Hz. Phase angle needs to be set to zero to synchronize AC
generators. It also applies to the triggering of SCRs and Triacs for power control. The
phase angle between AC current and voltage determines power factor. The Laureate
phase
angle meter and transmitter provide exceptionally fast response and high accuracy for low
frequencies, such as AC line frequency.
Phase angle measurement
with the Laureate phase angle meter or phase angle transmitter requires that two signals with identical periods be applied to Channels A and B. A display
from -180º to +180º is obtained by timing the rising edge of one channel
and the falling edge of the other channel, and programming a 180º offset.
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.
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.
Serial Data
I/O & Programming
Laureate TM Series transmitters send data as a serial digital signal.
RS485 or RS232 signal levels are jumper selectable and can each be
associated with either the Modbus protocol or Laurel’s simpler Custom
ASCII protocol.
- Modbus protocol
operation is fully compliant with the Modbus Over Serial Line
Specification V1.0 (2002) for 2-wire, half-duplex connection. This
includes RTU or ASCII modes, addressing of up to 32 devices per
RS485 line without a repeater, and up to 247 digital addresses.
Modbus operation allows devices by different manufacturers to be
connected in parallel and be addressed using the same protocol.
- Laurel’s 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’s datalogging software.
Transmitter programming is via
the unit's three-terminal serial port using Laurel's PC-based
Instrument Setup Software.
This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from
Laurel (P/N CBL03). Laurel's Serial I/O transmitters and meters can also be part of PC-based data logging systems using Laurel's
Datalogging Software, which operates under the Laurel ASCII Protocol. A single software command switches
between the Modbus and Laurel ASCII Protocols.
Transmitter
Options
Options include dual solid state relays for local alarm or control
and an isolated 4-20 mA or 10V (selectable) analog output, effectively
providing a linearized analog transmitter output that tracks the reading
that would be transmitted digitally. The analog output provides 12-bit (4096 step) resolution of the output span
and
is ultra-linear to within one bit. Its accuracy is ±0.05% of span for
all signal types, except for AC rms, where accuracy is ±0.1%.
Output isolation from signal and power grounds is provided by a separate on-board power supply,
which can drive 20 mA into a 500 ohm load for
10V compliance. Output isolation eliminates problems caused by
ground loops.
DIN Rail Mounting
Laureate transmitters are housed in a 35 mm DIN rail case that is only 22.5 mm (0.89")
thick. Signal connections are via detachable screw clamp plug connectors.
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Specifications
Laureate Serial Output Transmitter, AC Phase Angle Input
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Phase
Angle Operation |
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 |
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 |
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 I/O (standard) |
Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS-485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance |
RS485 (default) or RS232 (jumper selectable)
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) |
Jumper Selection 1
Jumper Selection 2
Jumper Selection 3 |
10V @ 60 mA, isolated to 50V from signal ground
5V @ 50 mA, isolated to 50V from signal ground
15V @ 60 mA, non-isolated |
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Dual Relay Output (optional) |
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 (optional) |
Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation |
0-20 mA, 4-20 mA or 0-10 Vdc (selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load )
12 bits (4,096 steps)
±0.05% of output span
250V rms working, 2.3 kV rms per 1 minute test |
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Power Input |
Standard power
Low power option
Frequency
Power Isolation |
95-240V AC ±10% or 90-300V DC
12-30V AC or 10-48V DC
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test. |
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Mechanical |
Case Dimensions
Case Mounting
Electrical Connections |
120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Detachable screw clamp plug connectors |
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Environmental |
Operating Temperature
Storage Temperature
Relative Humidity |
0°C to
70°C
-40°C to 85°C
95% at 40°C, non-condensing |
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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Ordering
Guide
Modbus
or Laurel ASCII Protocol Serial I/O Transmitter,
AC Phase Angle Input
Create a
model number in this format: TM8020FR. This is
for a serial output transmitter, Extended main board,
95-240 Vac power, isolated dual solid state relays, no
analog output, and dual channel frequency signal
conditioner. Includes detachable screw clamp connectors.
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Transmitter
Type |
TM Laureate Transmitter, Modbus
or Laurel ASCII Protocol. |
$210 |
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Main
Board |
8 Extended Main Board (required for phase) |
$40 |
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Power |
0 Isolated 95-240 Vac & 90-300 Vdc
1 Isolated 12-30 Vac & 10-48 Vdc. |
NC
$30 |
Setpoint
Output |
0 None.
2 Isolated Dual Solid State Relays. |
NC
$30 |
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Analog
Output |
0 None.
1 4-20 mA or 0-10V analog output. |
NC
$25 |
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Input
Type |
FR Dual-Channel Frequency. |
NC |
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Accessories |
CBL03 RS-232 cable, TM to computer.
CBL02 USB to RS-232 cable adapter. |
$19
$39 |
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Order from
distributors for shipment to USA or Canada. |
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Order online for
international shipment. |
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