M4serviceManual_e - 第73页

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 volum e …

4 Electrical Section

4-6

Adjustment of Board Detection Sensors

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

● LC1-M90H3-00X PHOTO SENSOR E3Z-D61 (OMRON）

z Entrance sensor

z Exit sensor

z Exit buffer arrival sensor

■ Adjusting Method

① Place a PCB on the conveyor belt in the direction in which PCBs will be placed for actual production

operation.

② Turn the sensor’s sensitivity volume counter-clockwise (toward “min”) as far as it will go, to set the

sensitivity to the minimum level.

*The volume can be turned 3/4 turns. Turning it clockwise (toward “max”) increases the sensitivity

and turning it counter-clockwise (toward “min”) decreases it.

③ With the PCB detected by the sensor, turn the volume clockwise (toward “max”) gradually, up to the

point (A) where the orange LED (operation indicator) begins to light up.

④ Remove the PCB and turn the volume clockwise (toward “max”), up to the point (B) where the orange

LED begins to light up. (If the orange LED does not light up even if the volume is turned clockwise as

far as it will go, the position to which the volume has been turned clockwise as far as it will go will be

considered to be position (B).)

⑤ The center position between the positions (A) and (B) is set as the adjustment position. With the PCB

detected at that position, check that both orange and green LEDs light up at the same time. Also check

that only the green LED lights up 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).

Operation selector switch

Sensitivity volume

Operation-stable

indicator

(Green LED)

Operation indicator

(Orange LED)

Sensor emitting direction

min max

Enlarged View of Sensor

(Shown in upside down

direction)

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.