LED SMT Reflow Oven

Features:

This machine utilizes IR and hot air heating technology, equipped with a special design wind wheel for stable speed and uniform temperature, suitable for uninterrupted soldering of LED and BGA components.

It features a crawler-type conveyor and five temperature zone heating systems. Each zone has independent PID control and up-down heating, ensuring accurate and well-proportioned internal temperature. It heats up to working temperature from room temperature in approximately 20 minutes.

The intelligent temperature wave heating type offers an oversized capacity wave selection, with eight temperature waves to satisfy various welding technological requirements.

A programmable temperature wave memory storage function allows for automatic completion of the entire welding process according to preset waves.

It adopts thermocouple temperature measurement with a compensation circuit for more accurate temperature measurement and perfect wave formation.

PID intelligent temperature control technology ensures accurate temperature control. The imported large current solid-state relay non-contact output effectively prevents damage to ICs or circuit boards from rapid or uninterrupted warming, making the welding process more scientific and safe.

The transmission system uses an imported frequency conversion motor with PID closed-loop speed control and an imported 1:150 turbine speed reducer for smooth operation.

The speed adjustable range is 0-1600mm/min.

It features an independent wheel structure and special stainless steel strut, durable and wear-resistant, ensuring smooth runs with speed precision up to ±10mm/min.

An independent cooling zone ensures the PCB board is at a low temperature when required.

The friendly human-machine operation interface with a perfect LCD display allows connection to a PC to clearly view the entire repairing process.

The ergonomic design is practical and easy to operate. Its good build quality, light weight, and small footprint allow it to be easily benched, transported, or stored.

Technical parameters

Main parts

• Complete machine: 1
• Power line: 1
• User manual: 1

Description of the main parts

1. Welding table main body

   The main body of the reflow oven, showing the control cabinet, horizontal band of the net, and idler wheel.

2. Control cabinet Panel

   The control panel includes switches for power, motor, temperature zones, and a belt speed knob, along with an LCD display screen and press buttons.

3. The instruction of the wiring for 380V

   Wiring diagram for a 380V connection showing L1, L2, L3 as firewire, N1, N2, N3 as zero wire, and PE as earth wire. All lines must be more than 4mm².

   Wiring diagram for a 220V connection showing L1, L2, L3 connected in parallel to the fire wire, N1, N2, N3 connected in parallel to the zero wire, and PE connected to the earth wire.

Operating Instructions

1. Enter the setting interface upon starting the machine. Press F2 to select the wave, F1 to select the point, F3/F4 to adjust temperature zones up/down, and F5 to initiate heating.
2. Five red switches control the upper 1/down 1/upper 2/upper 3/down 2 temperature zones.
3. Once the temperature stabilizes, open the Motor switch and adjust the conveyor belt speed.
4. Press F2 to stop heating and return to the setting interface.
5. Temperature wave purposes:
   • Wave one and two: For soldering less lead paste (e.g., 85Sn/15Pb, 70Sn/30Pb).
   • Wave three and four: For soldering more lead paste (e.g., 63Sn/37Pb, 60Sn/40Pb).
   • Wave five and six: For soldering high-melting-point lead-free paste (e.g., Sn/Ag3.5; Sn/Cu.75 Sn/Ag4.0/Cu.5 Sn95.5/Ag3.8/Cu0.7).
   • Wave seven and eight: For soldering lead-free solder in melting point (e.g., Sn/Ag2.5/Cu.8/Sb.5; Sn/Bi3.0/Ag3.0).
6. Attentions:
   • Select the appropriate wave based on chip size and welding requirements.
   • Heating temperature regions are distributed in upper three areas and lower areas.
   • There are various solder pastes; this product offers eight waves, each with five adjustable sections for time and temperature.

Foundation for wave set

1. The reflow soldering theory and the temperature wave: When the PCB enters the heat-up area, solvent and gas in the solder paste evaporate, and flux wets the pad and component. The solder paste melts, covering the pad and insulating it from oxygen. In the heat preservation area, the PCB and components are preheated. Rapid heating in the welding area can damage components. In the cooling area, the liquid solder solidifies.
2. The temperature is crucial for welding quality. The warming slope and peak temperature should be consistent. Before reaching 160°C, control the heat-up speed to about 1°C/S to prevent PCB damage and flux volatilization. Set the peak temperature 20°C-40°C above the solder paste melting point, with a reflow time of 10S-60S. Incorrect settings can lead to poor welding or component damage.
3. The set of the temperature wave: Set waves according to solder paste type, PCB, component density, and size. Lead-free welding temperature should generally be 40°C higher than the melting point.
4. Temperature Area Set: Set the temperature and belt speed to initial values.

Operation Steps

1. Preheat the cooling oven for 15-20 minutes.
2. Once the temperature is stable, pass the PCB board through the reflow system. If reflow is insufficient, adjust temperature or speed. If reflow is too fast, adjust accordingly.
3. If there is no reflow, reduce the belt speed (e.g., from 500mm/min to 460mm/min) and potentially increase temperature by about 30°F. Alternatively, adjust temperature by approximately 5°C without changing speed, ensuring it does not exceed component bearing capacity.
4. Pass the PCB board through the system with the new settings. Repeat adjustments if necessary.
5. Heat temperature waves are adjustable via transmission belt speed. Reducing belt speed increases product heat temperature, while increasing belt speed decreases it.
6. Attention: For PCBs with components, ensure complete reflow; partial reflow may not damage components.
7. When setting temperature, start low and increase. If the heat range is too high, increase transmission speed or reduce set temperature.

Equipment Installation

1. Set up field: Work in a clean environment, away from electromagnetic interference. Do not position oven exits and entrances facing fans or windows.
2. Power supply: Use a five-wire system 380V and ensure proper grounding. Professional electrician operation is recommended.
3. Adjust the reflow oven height: Use adjustable machine legs and an industrial or alcohol gradienter to ensure the dryer is completely horizontal.
4. Caution:
   • Maintain a clean working environment for good welder quality.
   • Do not use or store the machine outdoors in high temperature or humid conditions.
   • Exercise caution regarding high temperatures during operation to avoid scalds.
   • Turn off the power supply before overhauling the machine to prevent electric shock or short circuits.
   • After overhauling, check all parts, especially the net-belt position, to ensure it is not locked or fallen off.
   • Ensure the machine is stable and horizontal. Adjust legs to keep the transmission horizontal to prevent PCB shifting.
   • Do not place large, heat-absorbing components into the oven, as this can damage the net-net and affect temperature.
   • Apply lubricating oil to the transmission chain every 7 days.
   • Do not place flammable or explosive goods near the reflow oven.
   • Do not reach hands into the reflow oven during normal operation.

Daily Maintenance

1. Keep the electrical control cabinet clean.
2. Check the fan shaft sleeve for good condition.
3. Check the fan and electro-motor for abnormal sounds.
4. Ensure the fan operates flexibly.
5. Check air holes for any obstructions.
6. Check the transmission net-belt for good condition.
7. Check the electrical chest and equipment for abnormal sounds.
8. Check the transmission part for good condition and abnormal sounds.
9. Before turning on the machine, verify the working voltage is safe and stable. Ensure all parts function normally. When turning on, check that parameters match the last shutdown. When turning off, do not leave the transmission belt in the hot area; turn off the temperature, allow it to cool, and then stop the belt.
10. Lubricate the driving rolls every two months.
11. For motors operating at high temperatures for extended periods, apply lubricating oil twice a week or more to ensure normal operation.
12. Clean residual goods on the fan blade and motor timely to prevent short circuits and fan damage.
13. Ensure the machine is properly earthed when using a five-wire system.

Statement: These images and screenshots in this product manual may vary slightly from the actual purchased product.