c900795.R02_EN.pdf - 第105页
4 Electrical Section 4-31 Cautions about overall electrical items Once rats enter indoors or buildi ngs, they easily get int o machines. They m ay tear wirings and leave excrement that can cause se rious dam age to machi…
4 Electrical Section
4-30
● LC2-M912A-01X PHOTO SENSOR WTV4-3P1321S54 (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
Emitter/receiver
Sensitivity volume
Lower
sensitiv
Higher
sensitiv
Sensitivity Adjustment
by Volume
4 Electrical Section
4-31
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.
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.
Blue-green
attachments
4 Electrical Section
4-32
Computer Virus Prevention and Treatment
Recently, reports of computer virus infection on our machines are increasing. It’s supposed that because of
using high capacity USB memory stick for data backup and restore. First, prevention of infecting computer
virus is important but if the machine is infected already the virus must be eliminated by an anti-virus
software. This document describes the examples of prevention against computer virus and the treatment for
the machines that virus infected.
Computer Virus Prevention
We check every machine with the latest virus checker as one of the shipping inspection items. None of our
machine is infected any virus when they are shipped.
The most of infection route is the internet generally. Our machine has no capability to access internet and
no possibility of direct infection. The possibility is a secondary infection from a computer that is connected
with our machines through LAN connection. Common external memory storage such as USB memory stick
with the computer also can be a carrier of viruses.
Virus checker software cannot be installed in our machines. Followings are suggested for the prevention.
* Do not connect LAN with computer that can access the internet.
* Install virus checker software in the computer that shares storages for placement programs.
* Do virus scan the external memory storage like USB memory frequently by the virus checker.