M4serviceManual_e - 第74页
4 Electrical Section 4-8 Cautions about overall electrical items Once rats enter indoors or buildings, t hey easily get into m achines. They may tear wiri ngs and leave excrement that can cause se rious dam age to machin…
4 Electrical Section
4-7
● LG9-M90H6-00X PHOTO SENSOR WT4-2N112S28 (SICK)
z PCB arrival sensor
z Entrance buffer arrival sensor
■ Adjusting Method
① Use a precision flat-blade screwdriver to turn the sensitivity volume counter-clockwise as far as it will
go, to set the sensitivity to the minimum level. Place a PCB on the conveyor belt in the direction in
which PCBs will be placed for actual production operation, transfer it to a position just over the arrival
sensor, and turn the sensitivity volume clockwise until the sensor’s receiver indicator lights up.
NOTE: The sensitivity volume can be turned approx. five turns between the maximum and minimum level
positions. When the volume is beyond the maximum or minimum level position, a ratchet will be activated
and the volume turns freely with a chattering sound. The position at which such sound is heard is the limit
of the adjustable range.
② With the PCB placed on the conveyor belt, move it just above the arrival sensor back and forth a few
times by hand, to check that the receiver indicator turns ON and OFF in response to the PCB.
NOTE: The receiver indicator has three states: ON = stable operation, OFF = no sensitivity, Blink = unstable
operation. When adjusting the volume or checking sensor’s response to the PCB, make sure that the
indicator is not blinking.
③ From position (2), turn the volume 1/4 turns (90 degrees) clockwise to increase the sensitivity.
④ For verification, select [Manual] – [PCB Sensors ] to open the [PCB Sensors ] window. Check that the
PCB arrival sensor/entrance buffer arrival sensor respond to the PCB correctly. Also select [Manual]
– [Load Board ] to check that the PCB is automatically clamped properly.
NOTE: If the sensitivity is set excessively high, a malfunction may occur when the head passes over the arrival
sensor.
Receiver
indicator
Sensitivity Adjustment
by Volume
Higher
sensitiv
Lower
sensitiv
Sensitivity volume
Emitter/receiver
4 Electrical Section
4-8
Cautions about overall electrical items
Once rats enter indoors or buildings, they easily get into machines. They may tear wirings and leave
excrement that can cause serious damage to machines.
If rats tear wirings, it may cause short circuits. And it could cause a serious problem to machines.
If rats leave excrement over printed circuits boards or bared cables, it will be carbonized and may cause
fire.
REFERENCE:
Below is an example we had fire from a board. (See the pictures below.)
You can see blue-green attached material on the burnt location.
When copper burns, Cuo (copper oxide II) is black and Cu2O (copper oxide I) is red. According to the
blue-green color, the attached material can be considered Copper hydroxide. By this fact, we suppose water
existed on the burnt location.
Blue-green
attachments
COUNTERMEASURE:
1．Keep the room clean, neat and organized.
2．Lock up the room with no openings.
If once rats came in;
3．Sprinkle rat repellent.
4．Catch rats with adhesive sheets. (Emergency countermeasure)
5．Hire an rat exterminator.
To prevent damage caused by rats, it is important to keep rats-free environment.
If already rats are in your space, exterminate them by using rat repellent or other ways as mentioned above.
5 Materials
5-1
5
Materials
Standard Accessories
Nozzle, Locate Pin, Pushup Pin, etc.
Replacement Parts
Air Circuit Diagram
System Block Diagram
Layout of Electrical Parts