Reflow soldering - Common troubleshooting methods

Alarm item software processing method Alarm cause alarm exclusion
System power failure The system automatically enters the cooling state and automatically sends the PCB in the furnace to the external power failure
Internal circuit fault Repair external circuit
Overhaul internal circuitry
If the hot air motor does not rotate, the system automatically enters the cooling state
The hot air motor is damaged or stuck. Check the inverter
Replace or repair the motor
If the transmission motor does not rotate, the system automatically enters the cooling state
Motor is not stuck or damaged check frequency conversion
Replace or repair the motor
The board drop system automatically enters the cooling state. The PCB falls or gets stuck
Electrical eye damage at transport inlet and outlet
The external object mistakenly senses the entrance electric eye and sends the board out to replace the electric eye
If the lid is not closed, the system automatically enters the cooling state

The lifting screw travel switch is shifted to close the upper furnace and restart
Readjust the position of the travel switch
When the temperature exceeds the upper limit, the system automatically enters the cooling state
Solid state relay output short circuit
The computer and PLC cable are unplugged
Check whether the temperature control template works properly. Replace the hot spot couple
Replace solid state relay
Plug in the strip
Check the temperature control template
If the temperature is lower than the minimum temperature, the system automatically enters the cooling state. The output end of the solid-state relay is disconnected
Ground the thermocouple
The leakage switch of the generator tube is switched off to replace the solid state relay
Adjust the thermocouple position
Repair or replace the heating pipe
When the temperature exceeds the alarm value, the system automatically enters the cooling state
The output end of the solid state relay is normally closed
The computer and PLC cable are unplugged
Check whether the temperature control template works properly. Replace the thermocouple
Replace solid state relay
Plug in the strip
Check the temperature control template
The system automatically enters the cooling state when the temperature is lower than the alarm value. The output end of the solid-state relay is disconnected
Ground the thermocouple
The leakage switch of the generator tube is switched off to replace the solid state relay
Check the temperature control template
The system automatically enters the cooling state when the temperature is lower than the alarm value. The output end of the solid-state relay is disconnected
Ground the thermocouple
The leakage switch of the generator tube is switched off to replace the solid state relay
Adjust the thermocouple position
Repair or replace the heating pipe
The transport motor speed deviation is large. The system automatically enters the cooling state. The transport motor is faulty
Encoder fault
Inverter failure Replace the motor
Fix and replace encoder
Change frequency converter
The start button is not reset The system is in the waiting state. The emergency switch is not reset
The start button is not pressed
Start button damaged
Line damage reset emergency switch and press start button
Replacement button
Fix the circuit
Press the emergency switch The system is in the waiting state. Press the emergency switch
Reset the emergency switch and press the start button to check the external circuit
High temperature
1. The hot air motor is faulty
2. The wind turbine is faulty
3. Solid state relay output short circuit
4. Check the wind wheel
5. Replace the solid state relay working process
The machine cannot start.

1. The upper furnace body is not closed

2. The emergency switch is not reset
3. The start button is not pressed
4. Check the emergency switch
5. Press the Start button to start the process
The temperature in the heating zone does not rise to the set temperature

1. The heater is damaged
2. The power-on couple is faulty
3. The output end of the solid state relay is disconnected
4. The exhaust is too large or the left and right exhaust is unbalanced
5. The photoelectric isolation device on the control board is damaged

The transport motor is abnormal. The transport thermal relay detects that the motor is overloaded or stuck
1. Restart the transport thermal relay
2. Check or replace the thermal relay
3. Reset the thermal relay current measurement value
Inaccurate count
1. The sensing distance of the counting sensor is changed
2. The counting sensor is damaged
3. Adjust the sensing distance of the technical sensor
4. Replace the counting sensor
The error of the speed value on the computer screen is large
1. The speed feedback sensor senses the wrong distance

2. Check whether the encoder is faulty

3. Check the encoder circuit