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Laurel Electronics provides
digital panel meters / controllers, totalizers, counters, loop-powered meters,
temperature meters, for all types of transducers or process indication &
control. |
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Laureate™
Quadrature Position & Rate Meters
Accurate position or rate from quadrature encoders
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Features |
| Accepts
low-level differential or single-ended 5 V logic level
outputs from shaft encoders. |
Quadrature
count x1, x2 or x4. |
| Combined
pulse rate to 250 kHz. |
Programmable
display refresh rate up to 25/s. |
| Zero
channel input. |
6-digit
display scalable for direct readout in units of length. |
| Isolated
5, 10 or 24 Vdc excitation output to power shaft
encoder. |
AC
or DC powered. |
| Green
or red LED display |
NEMA-4X
1/8 DIN case. |
Optional
dual relays, 4-20 mA & 0-10 V analog output, RS-232/485
I/O, parallel BCD output, low voltage AC or DC power. |
Safety
certified to UL 61010C-1 (UL mark). |
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Description |
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| Position,
Length or Angle Measurement |
Scaled
Rate Measurement |
The
Laureate™ quadrature meter with the Standard
counter main board accepts the A & B signals from
shaft encoders to provide a highly accurate, scaled
display of position, length, or angle in engineering
units, such as ft, cm or degrees.
The A
& B quadrature signals are 90º out of phase, and
their phase relationship determines whether up counts
(+) or down counts (-) are produced. The meter
totalizes the counts and then scales the total in
software for display and control. A zero index signal
may be added as a third input to the A & B
signals.
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Use
of the Extended counter main board can convert the
quadrature meter from scaled position to scaled rate.
For example, it can display the speed of a moving slab
in ft/sec. Simultaneous display of position and rate
will require two meters. The
display and control output update rate for position or
rate is normally set to a maximum of 25/s, as determined
by a user-programmable gate time |
| Quadrature
Meter Capabilities |
Interface
Capabilities |
- One,
two or four transitions
may be counted at a maximum combined rate of 250 kHz
and be mathematically scaled for display in
engineering units from -999,999 to +999,999. The
quadrature board has input circuitry which may be
jumpered for either single-ended input signals or
for balanced line driver signals. Anti-jitter
circuitry eliminates errors produced by vibration of
the encoder.
- A
zero index pulse,
if available, is interpreted as by the meter as
corresponding to an integral number of revolutions
of the shaft encoder. It is used by the meter to
correct for any cumulative pulse count errors.
Special circuitry corrects for width of the zero
index pulse.
- In
the event of a power failure,
the current total may be stored in non-volatile
memory and can be used as the starting point for
counting when power resumes. Power fail or zero
index capabilities are alternate meter setup
choices.
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A
built-in isolated 5, 10, or 24 Vdc excitation supply can
power the encoder and eliminate the need for an external
power supply. Plug-in isolated analog output,
dual-setpoint controller, and RS-232/485 communications
boards can upgrade the Laureate quadrature meter from
stand-alone monitor to system interface and control. In
particular, the meter can provide an isolated 4-20 mA or
0-10V output signal scaled to the display. |
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| Display |
Excitation
Output |
Readout |
6
LED digits, 7-segment, 14.2 mm (.56"), red
or green. |
5
Vdc |
5
Vdc ±5%, 100 mA max |
Display
Update Rate |
Programmed gate
time + 30 ms + 1-2 signal periods |
10
Vdc |
10
Vdc ±5%, 120 mA max |
Range |
-99999
to +99999 |
24
Vdc |
24
Vdc ±5%, 50 mA max
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Indicators |
4
red LED lamps |
Output
isolation |
50
Vdc to meter ground |
| Quadrature
Position Mode |
Analog
Output (optional) |
Zero
Adjust
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-999999
to +999999
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Output
levels |
0-10V,
0-20 mA, 4-20 mA (jumper selectable) |
| Compliance |
2
mA at 10V (5 kOhm load), 12V at 20 mA (0-60 ohm load) |
| Span
Adjust |
0
to 999999 |
Scaling |
Zero
and full scale adjustable from -99999 to +99999
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Resolution
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12
bits (0.025% of full scale)
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| Serial
Data I/O
(optional) |
Power |
Board
Selections
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RS232,
RS485, Modbus RS485
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Voltage,
std.
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85-264
Vac and 90-370 Vdc
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Protocols
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Modbus
RTU, Modbus ASCII, simpler Laurel ASCII
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Frequency
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DC
or 49-440 Hz
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Data
Rates
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300
to 19200 bps
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Voltage,
opt. |
8-28
Vac and 9-37 Vdc
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| Digital
Addresses |
247
(Modbus), 31 (Laurel ASCII), |
Power
isolation |
Safety-rated
to 250 Vac, meter ground to earth ground,
DC to 60 Hz, 4.2 kVp per High Voltage Test |
| Isolation |
250V
rms working, 2.3 kV rms per 1 min test |
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Inputs |
Types
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Differential
or single-ended quadrature |
Differential
low threshold voltage |
-200
mV
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| Transitions
Monitored |
x1,
x2 or x4
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Differential
common mode |
±
7V
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| Max
Pulse Rate |
250
kHz at x1, 125 kHz at x2, 62.5 kHz at x4 |
voltage |
2.5V
to 10V |
| Differential
high threshold voltage |
+200
mV |
Single-ended
high voltage |
-1V
to +1V |
| Environmental |
Operating
Temperature |
0°C
to 55°C |
Storage
Temperature |
-40°C
to 85°C |
Relative
Humidity |
95%
at 40°C, non-condensing |
Protection |
NEMA-4X
(IP-65) when panel mounted |
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Typical
Applications |
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Using
Quadrature for Cutting to Length |
Using
Quadrature for X-Y Positioning |
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Controlling
the repetitive cutting of material to length is an
excellent application of the Laureate quadrature
meter.
The
quadrature encoder shares the shaft of a sensing
wheel, whose rotation corresponds to lineal
displacement of material. The meter compares the
displacement reading against setpoint information,
and then uses its dual relays to first slow down and
then cut the material. |
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Accurate
X-Y position or rate can be obtained from two shaft
encoders, which convert linear position to
quadrature signals as a shaft turns. In addition to
serving as a display, each Laureate can use its
optional dual relay setpoint capability for closed
loop control. It can also transmit data via RS-232,
RS-485, or a 4-20 mA analog signal. |
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Using
Quadrature to Monitor a Drilling Operation |
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The
Laureate is compatible with all flowmeters which
generate pulses at a frequency proportional to
flow rate. The Extended version can display scaled
rate or total for the same input at the push of a
button, and alarm from both the rate and total.
The Extended version can also linearize flow
transducers so as to extend their dynamic range. |
Call (800 - 576 -
6308) For Details
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FLW,
Inc - 3505
Cadillac Ave - Bldg E - Costa Mesa, CA. - 92626 - USA - Ph (714) 751 -
7512 - Fax (714) 751 - 0213
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