¶ Safety Warning
IMPORTANT!
It's crucial to power off the printer before performing any maintenance work on the printer and its electronics, including tool head wires, because leaving the printer on while conducting such tasks can cause a short circuit, which can lead to additional electrical damage and safety hazards.
When you perform maintenance or troubleshooting on the printer, you may be required to disassemble some parts, including the hotend. This process can expose wires and electrical components that could potentially short circuit if they come into contact with each other or with other metal or electrical components while the printer is still on. This can damage the electronics of the printer and cause further damage.
Therefore, it's essential to switch off the printer and disconnect it from the power source before doing any maintenance work. This will prevent any short circuits or damage to the printer's electronics. By doing so, you can avoid potential damage to the printer's electronic components and ensure that the maintenance work is performed safely and effectively.
If you have any concerns or questions about following this guide, open a new ticket in our Support Page and we will do our best to respond promptly and provide you with the assistance you need.
¶ Introduction
The common cause of printer tripping is usually due to the presence of leakage in other electrical appliances in the household (within standard range), combined with the printer's own leakage (also within the standard range). When the total leakage exceeds the threshold of the leakage protector, it will result in tripping.
The leakage of the Bambu Lab printer complies with the IEC62368 safety standard, with leakage current limited to half of the maximum limit specified by regulations.
If your printer has leakage or tripping issues, please ensure that the printer and the electronic household meet the following three requirements:
¶ 1：Ensure that the grounding of your home's electrical system is functioning properly with the help of a professional electrician.
¶ 2：Ensure that the machine is properly grounded.
- Please perform a continuity test using a multimeter. Connect the red probe of the multimeter to the metal casing or screw hole of the printer (press firmly to ensure a good connection, avoiding interference from surface paint). Connect the black probe to the middle pin of the triangular power plug at the back of the printer. If continuity is established and the value is close to 0, it indicates that the printer's grounding is good.
 |
 Connect the red probe of the multimeter to the metal casing |
 Connect the red probe of the multimeter to the screw hole |
- Plug the provided power cord back into the machine. Keep the red probe in the same position and connect the black probe to the middle socket of the plug on the power cord. If there is no continuity, it indicates a problem with the power cord. If continuity is established and the value is close to 0, it indicates that the printer's grounding is good.
 |
 Connect the red probe of the multimeter to the metal casing |
 Connect the red probe of the multimeter to the screw hole |
Note: The test method for EU plugs is the same as above and the middle of the EU plug is the ground.
¶ 3：Ensure the optimal wiring method for the AC control board.
Before proceeding with any troubleshooting, please first check the wiring of the AC control board in the printer. The printer has two wiring ways (both compliant with the IEC 62368 safety standard). Using the wiring on the right side may reduce leakage current, but both wiring ways have leakage current within regulatory limits.
- AC board installation tutorial（V2 version ）
- AC board installation tutorial（V3 version）
The wiring on the right side has a lower leakage current: the blue wire is connected to the first terminal, and the brown wire is connected to the second terminal.
After meeting the above three requirements, please proceed with troubleshooting based on the situation you encounter.
¶ Case 1: Only one printer is in operation, and there is leakage or tripping when the heatbed is heating.
If you encounter this situation, please contact customer support for assistance. Click here to open a new ticket in our Support Page.
¶ Case 2: You have multiple printers, and there is leakage or tripping when multiple printers are operating simultaneously.
The heatbed is a high-voltage device, and it's possible for the aluminum substrate of the heatbed to have leakage issues. It's common for household appliances, such as computers, to have a certain level of leakage. The leakage current of the Bambu Lab printer complies with the GB4341 and IEC62368 safety standards, with the leakage current limited to half of the maximum regulatory limit.
If you need to use multiple printers simultaneously, it may cause the total leakage current to exceed the threshold of the leakage protection device and result in tripping. After consulting with a professional electrician, it is recommended to upgrade the leakage circuit breaker or install dedicated leakage circuit breakers for the printers.
For users with printers powered by 220/230V, if you need to use multiple printers simultaneously, it is advisable to install a transformer that converts 220/230V to 110V with the assistance of a professional electrician. It's important to note that using a transformer doesn't guarantee that tripping won't occur, but increasing the capacity can reduce the risk of tripping.
¶ Case 3: When you connect the power cord to the printer and turn on the power switch, the power switch indicator light does not illuminate.
In this situation, it is highly likely that the fuse has blown, and you will need to replace the fuse.
¶ End Notes
We hope that the detailed guide we shared with you was helpful and informative.
We want to ensure that you can perform it safely and effectively. If you have any concerns or questions regarding the process described in this article, we encourage you to reach out to our friendly customer service team before starting the operation. Our team is always ready to help you and answer any questions you may have.
Click here to open a new ticket in our Support Page.
We will do our best to respond promptly and provide you with the assistance you need.