For electrical assembly, current leakage in a printed circuit board (PCB) can result in intermittent or permanent failure. Current leakage can occur due to insulation resistance reduction (due to presence of contamination) between adjacent solder-pads on a PCB.
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This hygroscopically induced moisture absorption phenomenon can for example intensify due to dissociated hydronium ions (i.e. from activators), to further result in malfunction and complete assembly failures.
Conformal coatings are layers of material that are applied on and adhere to the PCB and its components to protect from environmental hazards. There are a wide variety of materials used as conformal coatings ranging from thick layers of silicone to nano-coatings like Parylene.
The coating, when applied, will conform to the shape of everything on the surface, including any contaminants or residues leftover from the production process. Trapped contaminants can cause conformal coatings to warp, crack, or peel which re-exposes the PCB to the environmental hazards the coating layer was meant to protect against.
Spray-in-air inline cleaning machines are ideal when cleaning electronic assemblies with densely populated boards having low standoff components and when requiring high production throughputs.
The PCBs are placed on an automatic conveyor belt and run through individual process steps, where cleaning, rinsing and drying are performed in separate sections of the inline machine.
The spray-in-air batch system operates using technology very similar to the technology used in a dishwasher. All process steps are executed within the same process chamber. The cleaning medium is sprayed onto the electronic assemblies through nozzle fittings on rotating spray arms.
The cleaning effect is achieved primarily by the volume of cleaning medium passed over the substrates rather than the spray jet pressure like in inline processes.
Ultrasonic systems submerse the PCB in a cleaning medium that is then agitated with soundwaves exceeding 20 kHz. Ultrasonic cleaning can be useful in cleaning under components and complex geometries since the sound waves are capable of reaching the populated circuit board from every angle.
Many industry cleaning machines have an automatic frequency adjustment for the modulation of the ultrasound (sweep) working frequency, which prevents “hot spots” and allows material-friendly cleaning.
Sometimes individual PCBs need to be cleaned with unique geometries and materials. In this case, nothing beats good, ol’ fashioned elbow grease. Manual cleaning requires no investment in equipment and is popular in applications where the throughput is low like building prototypes or performing electronic component rework/repair. If a facility is producing medium/high throughput, running several shifts and requires reliable and repeatable cleaning results, an automated cleaning process is recommended.
Trial run
Trial run on the basis of proof of normal operation, test run PCB main check the following points:
a) Operating speed should not be adjusted too high;
b) Check whether the PCB goes in / out smoothly;
c) When there is no gap between the surface of the PCB and the roller when passing through the PCB;
d) Check the drum machine base plate holder is smooth;
Chapter IV: Machine Operation Steps
1.Machine operation
After debugging, connect the machine signal cable and power supply; open the control panel “power” button.
Adjust the track to the PCB width.
Precautions
Into the automatic mode before the track cannot have a PCB to stay, otherwise the machine alarm cannot enter.
The belt sends the machine alarm after the safe time set by the program exceeded, press the reset key after processing the trouble to cancel the alarm.
During production commissioning, the hand or object should not be placed under the rotating device under the condition of electricity / air source;
It is forbidden to put the hand near the exercising device in production operation.
Please keep the body in operation with the operation panel to avoid accidentally touching the operation panel switch, resulting in abnormal stoppage;
Prohibit the use of hand, clothing or other items in automatic mode sensor photoelectric switch;
It is forbidden to manually place the PCB in the carrier platform or rail in automatic mode.
Electrical system operation
1 Overview
The machine electrical system using single-phase 220V power supply, the system mainly by the PLC and touch screen control panel and other components.
2. Operating Procedures (Description)
2.1 Turn on the power control switch, release the emergency stop button self-locking, the operation panel is as follows:
Operation interface:
Main interface:
Select the interface you want to enter.
Manual interface:
The motor can be transferred independently, cleaning operation, substrate holder on / off, if you want to return, be sure to put all the switches in the OFF position.
Automatic interface:
First enter the setup interface will need to set the function and click the “Start” button to enter the automatic production state.
Set interface:
Open the “cleaning action” and “substrate support” PCB cleaning mode.
Turn off the “cleaning action” and “substrate holder” to PASS (pass-through board) mode.
Power saving mode: It refers to the time that the roller rises after each PCB is cleaned (refer to the power saving mode screen).
The number of settings: refers to the number set to cut or replace the sticky paper, according to the PCB surface cleaning degree and set a specific number PCB surface dust more,
The quantity should be set less, on the contrary, less PCB surface dust, the number should be set more, improve the overall efficiency.
Production Count: Shows the current production quantity.
Power saving mode interface:
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If the power-saving time is set to 30 seconds, no PCB will enter the machine within 30 seconds after the PCB is output, and the sticky roller will rise until the next PCB enters before it can be directly closed without this function.
I / O monitoring interface:
III. Schematic and wiring diagram
Electric box:
Sensor distribution:
PLC I / O:
Online signal:
If the post-engineering machine is reflow machine without signal line can be connected, then the brown X15 and blue 0V two lines can be shorted!
IV. Installation and maintenance precautions
1) The device uses single-phase 220V power supply; the user can press the electrical schematic maintenance;
2) This equipment must be grounded separately;
3) Often use a clean dust-free paper or cloth and alcohol to clean the sticky roller
4) In addition to the need for cleaning and adjustment, the electrical box door must be closed and not open at will;
5) Daily cleaning should check the various parts of the electrical insulation and fastening the junction of the situation, so as to avoid fever and oxidation;
6) Before operating this unit, you must read this manual carefully, remembering not to operate it arbitrarily;
7) Duplex oil surface, please check once a week to ensure that no water filter cup;
8) Check the battery valve leak-free air leak phenomenon;
9) Check proximity switch and the magnetic sensor sensitivity before operation;
10) Please keep the machine
V.Operating process setting process
-Turn on the power, turn on the air supply and connect the rear engine signal cable
-Eliminate stop
-PLC program initialization / reset
-Width adjustment
-Enter the automatic state
-The machine is started normally
-normal operation
-Stop button is pressed
-Disconnect the power
Chapter V: Common Fault Handling Measures of Main Components
No board signal sent
Failure causes and solutions:
The two sensors on the track cannot be sensed and the drawer roller holder must be pushed into place.
Automatic into the board after the alarm
Failure causes and solutions:
The PCB is jammed causing the belt to run out of time. Reset the machine and align with the front engine track.
PCB is too long, at the same time induction into the track into the board and the board sensor. Flow direction length exceeds the rated length of the machine cannot be used.
Alarm when entering auto mode
Failure causes and solutions:
A PCB stays on the track, clear the PCB on the track before entering.
Drawer roller holder must be pushed into place.
Count has not reached the set number.
Chapter VI: Regular Preservation
Regular maintenance is in addition to routine maintenance matters, according to the provisions of the cycle, the machine stopped, there are plans for the usual difficult to confirm the problem inspection trimming, in order to operate safely and improve the quality of some damage is not able to work. Usually once a month for key maintenance; once a year to test the rotation of each part; the wear and tear of moving parts, vibration and so on.
To ensure the normal operation of the equipment and avoid any trouble, the equipment should be regularly inspected and lubricated.
-Often use a clean dust-free paper or cloth and alcohol to clean the sticky roller.
-Monthly to rail, transmission bearings, sprocket lubricated Department.
-Keep the guide rail and chain slot clean and tidy, no foreign body stuck.
-Regularly check the various parts of the fastening screws, no loose phenomenon
-Periodically clean the photoelectric sensor so as not to be contaminated by foreign matter and cannot work properly.
-Not free to change the PLC program, so as not to disorder the program.
-Clean the dirt and impurities sticking on the guide rail in time
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