KEYENCE LK-2000 Series - Manual (Page 19)

19
■ Noise interference (The sensor head is case-grounded.)
Isolate the sensor cable and extension cable(s) from high-tension
lines or power lines, otherwise the sensor may malfunction or the
laser diode may deteriorate due to noise interference.
• If noise is present at the surface where the sensor head is mounted,
install insulator between the mounting surface and the sensor head.
• Earth-ground the frame grounding terminal.
Do not connect the sensor head while the controller is turned on.
The sensor head may be damaged.
■ Compatibility
The LK series controller and sensor head have been calibrated in pairs.
Be sure to use a sensor head and controller having the same serial
number, otherwise the values given in the specifications cannot be
attained.
■ Environment
Keep the sensor head free of water or oil. Any substance that
refracts light may cause unstable measurement.
Do not allow extraneous light to enter the lens of the sensor head
directly.
* When highly accurate measurement is required, attach shielding to
the sensor head. If extraneous light enters the lens when no target is
present, use a synchronous input to ignore it.
HINTS ON CORRECT USE
CAUTION
CAUTION
CAUTION
■ Ambient light
Although up to 10,000 lux ambient light is allowed by the specifications,
avoid using the sensor near lighting equipment that emits light in
recurring pulses, if possible. If the sensor must be positioned near such
equipment, minimize the effect by using a light shielding plate.
■ Warm-up
Allow approximately 30 minutes after the power is turned on before
using the LK series. The measurement value may gradually fluctuate
because the circuit is not stable immediately after the power is turned
on.
■ Cable extension
Keep the sensor head cable as short as possible to prevent noise
interference. (Less than 35 m)
Extension cables: LK-C2 (2 m), LK-C5 (5 m), and LK-C10 (10 m)
■ Sensor head orientation
When a target consists of different colored portions or different materials
separated by a border, measurement error may result depending on the
orientation of the sensor head. To minimize measurement deviation,
install the sensor head parallel to the border line, as shown below.
Incorrect Correct
LK-031
LK -031