c900773.R02_EN.pdf - 第104页

4 Electrical Section 4-34 ● LC2-M912A-00X PHOTO SENSOR WT4-2P112S34 (SICK) z PCB arrival sensor z Entrance buffer arrival sensor ■ Adjusting Procedure ① Use a precision flathead screwdriver to turn the sensitivity thumb …

4 Electrical Section

4-33

Adjustment of Board Detection Sensors

This section explains how to adjust the sensitivity of the board detection sensors.

● LC6-M90H1-00X PHOTO SENSOR E3Z-D81 (OMRON）

z Entrance sensor

z Exit sensor

z Exit buffer arrival sensor

■ Adjusting Procedure

① Place a PCB on the conveyor belt in the direction as if it is place in an actual production operation.

② Turn the sensor’s sensitivity thumb nut counter-clockwise all the way toward “min” and set the

sensitivity to the minimum level.

*Turning the sensitivity thumb nut clockwise toward “max” increases the sensitivity and turning it

counter-clockwise toward “min” decreases the sensitivity.

③ Slides the PCB along the conveyor belt and move it to above a target sensor. Turn the sensor’s

sensitivity thumb nut clockwise little by little toward “max” until the orange LED (operation

indicator) is lit. (This refers to (A) thereafter.)

④ Remove the PCB and turn the sensitivity thumb nut clockwise toward “max” until the orange LED is

lit. (This refers to (B) thereafter.) If the orange LED is not lit even though the sensitivity thumb nut is

turned all the way toward “max”, keep the thumb nut at far end on “max”. (In such case, this also

considered as and refers to (B) thereafter.)

⑤ Set the mid point between (A) and (B) as the adjustment position of the sensitivity thumb nut.

Once the adjustment position is fixed, check to make sure that both orange LED and green LED are lit

when a PCB is placed to above the sensor, and only the green LED is lit when the PCB is removed.

⑥ When the conveyor cover is provided because of the safety spec., attach a black rubber sheet to the

sensor detection position on the bottom of the cover to prevent false detection.

NOTE: Make sure that the operation selector switch is set to “L” (ON when light is entered).

max min

Sensor emitting direction

Large View of Sensor

Operation indicator

(Orange LED)

Operation-stable

indicator

(Green LED)

Sensitivity thumb nut

Operation selector switch

4 Electrical Section

4-34

● LC2-M912A-00X PHOTO SENSOR WT4-2P112S34 (SICK)

z PCB arrival sensor

z Entrance buffer arrival sensor

■ Adjusting Procedure

① Use a precision flathead screwdriver to turn the sensitivity thumb nut on an arrival sensor

counter-clockwise toward “min” all the way to its end. Place a PCB on the conveyor belt in the

direction as if it is place in an actual production operation. Slides the PCB along the conveyor belt and

move it to above a target sensor. Turn the sensor’s sensitivity thumb nut clockwise little by little

toward “max” until the reception indicator is lit.

NOTE: The sensitivity thumb nut can be revolved approximately five turns between the maximum and minimum

level positions. When the thumb nut is turned beyond the maximum or minimum level position, a ratchet

will be activated and the thumb nut idles with a chattering sound. The position at which such sound is heard

is the limit of the adjustable range of sensitivity.

② With the PCB placed on the conveyor belt, move it back and forth over the arrival sensor several times

by hand, and check to see that the receptive indicator turns ON and OFF in response to the detection

of PCB. (This refers to (A) thereafter.)

NOTE: The reception indicator displays three states of the sensor; ON = stable operation, OFF = no sensitivity,

Blink = unstable operation. When adjusting the thumb nut and checking sensor’s response to the PCB,

make sure that the indicator is completely lit and not blinking.

③ Turn the sensitivity thumb nut 1/4 turn (90 degrees) from position (A) clockwise toward “max”.

④ In order to verify the adjustment, go to [Manual] > [PCB Sensors ] and open the “PCB Sensors”

window. Check to see that the PCB arrival sensor/entrance buffer arrival sensor respond to the PCB

correctly. Also go to [Manual] > [Load Board] and check to see that the PCB is automatically

clamped properly.

NOTE: When the sensitivity is set excessively high, the arrival sensor may malfunction when the head passes over

it.

Reception

indicator

Emitter/Receiver

Sensitivity thumb nut

Lower

sensitivity

Higher

sensitivity

Sensitivity Adjustment

by thumb nut

4 Electrical Section

4-35

Cautions about overall electrical items

Once rats enter facilities and production sites, they easily come into machines and they may tear wirings

and leave excrement that can cause serious damage to machines.

When rats tear wirings, it may cause short circuits and it could lead to a serious problem to machines.

If rats leave excrement over printed circuit boards or torn and bared cables, it will be carbonized and may

catch fire.

REFERENCE:

The following pictures are examples of a circuit board which caught fire.

In these pictures, the black-colored burn represents CuO (Copper II Oxide) and the red-colored burn

represents Cu2O (Copper I Oxide). Besides these, the bluish-green substance is considered Copper

Hydroxide. Based on these factors, it is presumed that the fire cause is infiltration of water.

COUNTERMEASURE:

1．Keep the facility and production line 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.

When rats may have been already in the facility, exterminate them by using rat repellent or other ways as

mentioned above.

Bluish-green

substance