KEYENCE LB-70(W) Series - Manual (Page 12)

12
Incorrect Correct
HINTS ON CORRECT USE
Be sure to use a "W" type controller in combination with a "W" type
sensor head. If you connect a non "W" type controller to a "W" type
sensor head, it may cause an electric shock or may burnout the
controller or the sensor.
Operating environment
• Keep the sensor head free from water, oil or dust. Any substance that
refracts light or decreases the light quantity may cause measurement
error.
• Do not allow extraneous light to enter the lens of the sensor head.
When highly accurate measurement is required, attach shielding to
the sensor head.
* If extraneous light enters the sensor when no target is present, use
the laser emission control input.
Power supply
All circuit in the sensor head are grounded to the case through a
capacitor. However, noise conveyed through the power supply line may
cause the sensor head to malfunction. Use a stabilized DC power supply
having an insulated transformer. When using a commercially available
switching regulator, be sure to correctly ground the chassis ground or
earth ground terminal.
Warming up operation
Start using the LB series at least 30 minutes after you turn the power
ON. The circuit condition is not stable immediately after the power is
provided, so that the measurement value may vary.
CAUTION
Sensor mounting
• When a target consists of differently colored portions or different
materials separated by a border, measurement error may result
depending on the orientation the sensor head. To minimize measure-
ment deviation, install the sensor head parallel to the border line as
shown in the illustration below.
Tightly fasten the cable mounting ring
when installing the sensor head.
Avoid turning the cable when
installing or removing the sensor
head; otherwise the cable may be
damaged.
• The sensor head is case-grounded. If noise is generated on the
surface where the sensor head is mounted, it may cause variation in
the analog voltage output, or degradation and breakage of the laser
diode. In this case, install insulation between the mounting surface
and sensor head.
Detectable objects
Mirror surfaced objects may not be detected depending on the direction
in which the light beam is reflected from the target. To correct this,
carefully adjust the angle of the sensor head to the target.
Compatibility
The controller and sensor head are calibrated as pair. Therefore, to
satisfy specifications, combine units having the same serial number.