Banner L-GAGE LT3 User Manual
L-GAGE® LT3 Long-Range Time-of-Flight Laser Sensor
!
!
Self-contained laser distance sensor, two discrete outputs
Features
• Extremely long range: 5 m with white targets, or 3 m with gray targets for diffuse
mode sensors, up to 50 m for retroreflective models
• Two discrete (switched) outputs in each sensor, with independent window limits
• Discrete outputs can be used for precision background suppression
• Output select wire is used to choose either NPN or PNP outputs (see hookups)
• Fast, easy-to-use integrated push-button TEACH-mode programming; no
potentiometer adjustments
• Remote TEACH function for security and convenience
• Output response is programmable for three speeds
• High-grade retroreflective target included with each retroreflective-mode sensor
• Choose 2 m or 9 m unterminated cable, or 8-pin Euro-style swivel QD connector
• Rugged construction withstands demanding sensing environments; rated IEC
IP67, NEMA 6
†
. . .
This
WARNING . . .
Not To Be Used for
Personnel Protection
Never use these products as sensing
devices for personnel protection. Doing
so could lead to serious injury or death.
These sensors do NOT include the
self-checking redundant circuitry
necessary to allow their use in personnel
safety applications. A sensor failure
or malfunction can cause either an
energized or de-energized sensor output
condition. Consult your current Banner
Safety Products catalog for safety
products which meet OSHA, ANSI and
IEC standards for personnel protection.
CAUTION
sensor contains no userserviceable components.
Do not attempt to repair.
ncorrect component values may produce
I
hazardous laser radiation levels.
Models
Models
LT3BD
LT3BDQ
LT3BDLV
LT3BDLVQ
* 9 m cables are available by adding suffix “W/30” to the model number of any cabled
sensor (e.g., LT3BD W/30). A model with a QD connector requires a mating cable;
see page 11.
** Retroreflective range specified using included model BRT-TVHG-8X10P
high-grade target.
†
NOTE: See Banner website for information on analog/discrete models at:
Sensing
Mode
Diffuse Class 2
Retroreflective
bannerengineering.com
Laser
Class
Class 1
Sensing
Distance
0.3 to 5 m
(11.8" to 16.4')
0.5 to 50 m**
(20" to 164')
Cable*
2 m (6.5')
8-wire
8-pin
Euro-style QD
2 m (6.5')
8-wire
8-pin
Euro-style QD
Supply
Voltage
12 to
24V dc
Discrete
Output
NPN or
PNP
Selectable
Printed in USA 02/05 P/N 68503 rev. C
L-GAGE® LT3 Long-Range Time-of-Flight Sensor –
Microprocessor
User
Interface
Emitter
Circuitry
Analog
Signal
Processing
Time-of-Flight
Engine
Output
Circuitry
Laser
Emitter
Lenses Target
Receiver
Element
E
R
SIGNAL OUTPUT
FAST
MED
SLOW
TEACH
POWER
SPEED
Signal LED
Output LED
Response Speed
Indicators
Discrete Output
1
Teach LED
Discrete Output 2
Teach LED
Discrete Output 1
Programming
Push Button
Discrete Output 2
Programming
Push Button
Power ON/OFF LED
Response Speed
Push Button
D
D
Theory of Operation
A short electrical pulse drives a semiconductor laser diode to emit a pulse of light. The
emitted light is collimated through a lens, which produces a very narrow laser beam.
The laser beam bounces off the target, scattering some of its light through the sensor’s
receiving lens to a photodiode, which creates an electrical pulse. The time interval
between the two electrical pulses (transmitting and receiving the beam) is used to
calculate the distance to the target, using the speed of light as a constant.
Multiple pulses are evaluated by the sensor’s microprocessor, which calculates the
appropriate position value. The discrete (switched) output energizes whenever the
target is located between the user-programmed discrete window limits. Window
limits for both discrete outputs may be the same, or they may be programmed
independently.
Two Discrete Outputs
Figure 1. Theory of operation
Response Speed
Prior to setting window limits, use the sensor’s Speed push button to toggle between
the three response speed settings. The selected speed will be indicated by one of the
three Response Speed indicator LEDs (see Figure 2). See Specifications for further
information.
Sensor Setup
Allow 30 minutes after power-up to allow the sensor’s internal temperature to stabilize,
before operating or attempting to program the sensor. If the sensor will be used in
applications where the temperature is several degrees higher or lower than ambient,
allow the sensor to stabilize in that condition before programming the window limits.
(Range will decrease as the sensor warms up.)
The laser enable feature allows the sensor to be continually powered, and enabled only
when being used. This eliminates the need for the extended warm-up period between
uses.
The sensor’s red Signal LED indicates the condition of the received signal from the
object being measured. When programming window limits, this LED must be ON solid
(not flashing) for the sensor to accept the setting. On diffuse-mode models, to ensure
that the received signal will not be marginal during operation, move the target object
300 mm beyond the furthest desired set point during setup, and verify that the signal
LED is still ON solid.
Window Limits
Window limits may be taught to the sensor in several ways. The following methods
(beginning on page 4) describe the programming procedures using the push buttons on
the top of the sensor or via remote programming (remote TEACH).
2 P/N 68503 rev. C
Programming
Figure 2. Sensor features
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
L-GAGE® LT3 Long-Range Time-of-Flight Sensor –
RADIANT POWER 0.5 mW
650 - 670 n
m
COMPLIES WITH 21 CFR PART
1040.10 AND EN60825-1:199
4
DO NOT STARE INTO BEAM
CLASS 2 LASER PRODUCT
LASER LIGHT
Avoid exposure laser light emitted
from this aperture
Output 1
Near
Sensing
Range
Teach
Point 2
Output 2
Far
Sensing
Range
Teach
Point 1
Output 1
Near
Sensing
Range
Output 2
Far
Sensing
Range
Teach
Point
Two Discrete Outputs
Class 2 Safety Notes
Low-power lasers are by definition
incapable of causing eye injury within
the duration of the blink, or aversion
response, of 0.25 seconds. They must
also emit only visible wavelengths (400700 nm). Therefore, an eye hazard can
exist only if an individual overcomes
the natural aversion to bright light and
stares directly into the laser beam.
These lasers are required to have a
“hazard” label and to have an indicator
light to indicate that laser emission is
occurring.
When operating a class 2 laser:
• Do not permit a person to stare
directly into the beam
• Do not point the laser at a person’s
eye at close range
Beam Paths:
The beam emitted by a class 2 laser
product should be terminated at the
end of its useful path. Open laser beam
paths should be located above or below
eye level, where practical.
Push-Button Programming
Both outputs may be taught simultaneously, when complementary operation is required
(while one output is conducting, the other is not). When taught separately, each output
may be taught different limits (one output may be taught a window, and the other may
be programmed for background suppression, for example).
Remote Programming
To program the sensor remotely or to disable the keypad, the Remote Programming
function may be used. Disabling the keypad prevents accidental or unauthorized
adjustment of any programming settings. Connect the yellow wire of the sensor to +5
to 24V dc, with a remote programming switch connected between them.
NOTE: The impedance of the remote teach input is 55 kΩ.
Programming is accomplished by following a sequence of input pulses (see pages 4
and 5). The duration of each pulse (corresponding to a push button “click”), and the
period between multiple pulses, are defined as “T”: 0.04 seconds < T < 0.8 seconds.
Teaching Discrete Limits for Background Suppresson
For some applications, ignoring objects beyond a certain distance may be required. To
suppress the background, place a target object at the selected distance, and teach the
position twice. The sensor’s discrete output will activate when an object is detected
between the sensor’s minimum sensing distance and the taught position.
NOTE: The sensor allows for some forgiveness in this procedure. If the two limits are
not exactly the same (but less than 20 mm apart), the sensor will put the set
point at the “average” of the two limits.
Output 1 and Output 2 may be taught independent limits for background suppression
(see Figure 3).
To set both outputs at exactly the same limits, set them simultaneously. This will result
in complementary outputs (while one output is conducting, the other is not; see
Figure 4). Hysteresis will be controlled by Output 1 and Output 2 will follow.
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Figure 3. Each output has its own limit for
background suppression
Figure 4. The two outputs share identical
limits for background suppression,
but are complementary
P/N 68503 rev. C 3
L-GAGE® LT3 Long-Range Time-of-Flight Sensor –
or
D
D
D
or
D
D
D
T TT T T
T TT T
T
T TT T T
T TT T
T
D
or
D
D
D
Output 1
Near
Limit 2
Far
Limit 2
Output 2
Near
Limit 1
Far
Limit 1
Teaching Independent Limits for Either Output
Either output may be programmed first.
Figure 5. Each output has its own near and
Two Discrete Outputs
far limits
Procedure Result Procedure Result
• Push and hold
push button for
desired output
> 2 seconds*
Mode
Programming
• Position the target for
the first limit**
• “Click” the same push
button
Teach
First Limit
• Position the target for
the second limit
• “Click” the same push
button
Teach
Second Limit
Push Button
0.04 sec. ≤ “click” ≤ 0.8 sec.
• Appropriate TEACH LED
turns ON
• Sensor is waiting for first
limit
• TEACH LED flashes
• Sensor learns first limit
and waits for second limit
• TEACH LED goes OFF
• Sensor learns second
limit and returns
automatically to RUN
mode
Remote Wire
0.04 sec. ≤ T ≤ 0.8 sec.
No action required
• Position the target for the first
limit**
Output 1
• Single-pulse
the remote
line
• Position the target for the second
limit
• Single-pulse the remote line
Output 2
• Double-pulse
the remote line
• Appropriate TEACH LED turns
ON, then flashes at 2 Hz
• Sensor learns first limit and
waits for second limit
• Appropriate TEACH LED
goes OFF
• Sensor learns second limit
and returns automatically to
RUN mode
Repeat for other output, if a second output is desired.
Output
Program Second
* Sensor will return to RUN mode if first TEACH condition is not registered within 120 seconds.
** Press and hold the same push button (or hold the remote line high) > 2 seconds (before teaching the second limit) to exit PROGRAM mode
without saving any changes. The sensor will revert to the last saved program.
4 P/N 68503 rev. C
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Loading...