Handle laser marking machine power failure

Author:
Source:
Date: 2017-08-14

Laser marking machine is a low-power laser, its working principle is: the input graphics through the scanner or in the computer design their own graphics or text, in the computer management and control under the pattern of digital signal encoding (line and Field direction), and then digital-to-analog D / A conversion and analog-to-digital A / D conversion, and then amplified by the isolated power amplifier, the control unit into the motor to drive the mirror, according to the required direction of deflection, Leaving a very fine track This is the desired graphics.

The following problems occur when using a laser marking machine:


Fault one


Symptom: open the laser marking machine total power switch, press the trigger button, the power does not start.

Failure reasons: The fault is due to protection circuit action, resulting in AC 380V voltage is not on.

First of all, push the "AC380V power" switch, press the power "start" button to observe whether the AC contactor is working, if not work, look at the cold system is working (whether the water cycle), if the system is cold , It should check whether the water pressure protection device caused by water circulation is switched on, otherwise the AC contactor is damaged.

Second, with a multimeter R × 1K block to check the power circuit 2K / 10W power resistance is bad, such as broken, then replace it.

Finally, check to control whether the optical deflection motor 12V power supply is normal. (AC 17V), if not, then check the input and output of the transformer with or without AC voltage, input 220V, output 17V, if any, if there is no voltage, if no, check the rectifier circuit input (AC 17V) 220V voltage without 17V, the transformer is damaged and replaced.

Failure two

Symptom: laser marking machine work properly, but adjust the "current" button, power meter no display, always zero.

Cause: If there is no display, the power meter power failure; if always shown as zero, the power meter sampling signal is interrupted.

Method: Check the power meter power supply transformer rectified DC voltage 12V is normal, such as normal, check 7805 3 feet with or without 5V voltage, if no +5 V, 7805 three-terminal regulator tube is damaged, after replacement exclude.

If the power meter display is always zero, the power meter sampling signal is interrupted. Check the method: with a multimeter R × 1Ω file, according to the circuit schematic reverse search, and finally determine the broken line.

Failure three

Symptom: laser marking machine work properly, but adjust the "current" button, power meter no display, always zero.

Cause: If there is no display, the power meter power failure; if always shown as zero, the power meter sampling signal is interrupted.

Remedy: Check the power table rectified DC voltage 12V is normal, such as normal, check the 7805 1 foot with or without 12V voltage, if any, then 7805 three-terminal regulator tube damage, replacement, troubleshooting. If the display is always zero, the power meter sampling signal is interrupted. Check the method: with a multimeter R × 1Ω file, according to the circuit schematic reverse search.


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