Laurel Electronics LTE: Ethernet & 4-20 mA Output Transmitter for Position or Rate from Quadrature Encoders - Manual (Page 3)

LAUREL ELECTRONICS INC. , 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 3
Power Frequency
Power Isolation
Power Consumption DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test
2W typical, 3W with max excitation output
Mechanical
Dimensions
Mounting
Electrical Connections 129 x 104 x 22.5 mm case
35 mm rail per DIN EN 50022
Plug-in screw-clamp connectors
Environmental
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.
Application Examples
Using Quadrature for Cutting to Length
Controlling the repetitive cutting of material to length
is an excellent application of a Laureate quadrature
transmitter or Laureate quadrature meter. The
quadrature encoder shares the shaft of a sensing
wheel, whose rotation corresponds to lineal displa-
cement of material. The transmitter compares the
displacement reading against setpoint information,
and then uses its dual relays to first slow down and
then cut the material.
Using Quadrature for X-Y Positioning
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 transmitter, each Laureate transmitter
or meter can use its optional dual relay setpoint
capability for closed loop control.
Using Quadrature to Monitor a Drilling Operation
Quadrature can be used to track position and
vertical drilling speed of the bit in an oil drilling
operation. A shaft encoder is rotated by a cable that
moves with the drilling shaft. In this application, the
same encoder signal is applied to a first Laureate
quadrature transmitter for position, and to a second
quadrature transmitter for rate. Both transmitters
can send a 4-20 mA signal to a control room and be
alarmed. In this application, quadrature provides
much higher immunity to noise and jitter than a
magnetic pickup.