Laurel Electronics LT: 4-20 mA & Serial Data Output Transmitter for Position or Rate from Quadrature Encoders - Manual (Page 4)

LAUREL ELECTRONICS INC. , 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 4
Application Example
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.
Ordering Guide
Create a model a model number in this format: LT60QD, CBL04
Transmitter Type LT Laureate 4-20 mA & RS485 Transmitter
Main Board 6 Standard Main Board (for position, length or angle)
8 Extended Main Board (for bidirectional rate or position)
Power 0 Isolated 85-264 Vac
1 Isolated 12-32 Vac or 10-48 Vdc
Input Type QD Quadrature
Accessories CBL04 RS232 cable, LTA to computer or USB adapter
CBL02 USB to RS-232 cable adapter