
HL-G1 User's Manual
1.1 Safety Instructions
Inspection
Inspect the system regularly to maintain the performance of the system and
make it possible to use the system under optimum conditions.
Check that no I/O terminal connections are loose or disconnected.
Check that the glass surface on the laser aperture is free of dust, dirt, or
fingerprints.
Check that the power supply voltage is within the rated range (21.6 to
26.4V DC).
Check that the operating ambient temperature is within the range of -10°C to
45°C for the sensor head.
Check that the operating ambient relative humidity is within the range of
35% to 85%.
1.1.3 Safety Instructions for the Power Supply
Be sure to supply a rated voltage of 21.6 to 26.4VDC.
The internal circuit may be damaged if an external surge voltage (sin-
gle-polarity, full-wave voltage) in excess of 500V ± 1.2 x 50
μ
s is imposed.
Insert a surge absorber between power input terminals if the external surge
voltage is likely to exceed 500V.
Select a power supply with a maximum ripple of 0.5V (peak to peak) and a
minimum current capacity of 0.5A.
Be sure to ground the frame ground terminal (FG) in order to prevent an
adverse influence of high-frequency noise if a commercially available swit-
ching regulator is used for the power supply.
A transformer may be connected to the power supply on the condition that
the transformer is of isolation type. The product or the power supply may be
damaged if an auto transformer is used.
In order to protect the system from abnormally high voltages from the po-
wer supply line, be sure to use an isolated power supply with a built-in pro-
tective circuit.
In the case of using a power supply that does not incorporate a protective
circuit, be sure to connect the power supply to the system through a pro-
tective element, such as a fuse.
Power supply sequence for the sensor head
Arrange a power supply sequence so that the sensor head will be turned
ON earlier than the power supply.
Arrange a power supply sequence so that the power supply will be turned
OFF earlier than the sensor head.
Do not turn ON the sensor head again within 10 seconds after the sensor
head is turned OFF.
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