Enter what type of printer or upgrade the enhancement applies to.
Printer type - MK4, XL
Optional upgrades - None
Is your suggested improvement related to an existing problem? Please describe.
The current buddy firmware checks the state of the power panic line during initialization and throws error 13321/ ERR_ELECTRO_ACF_AT_INIT if the power panic line is disconnected. There is no way to bypass this in the firmware.
In this code, the acFault line is polled and checked to see if it is LO. If it is LO, Error 13321 / ERR_ELECTRO_ACF_AT_INIT is thrown.
This is fine for normal users, but if you have a UPS battery backup, power panic falsely trips when the PSU is switched over to battery backup. On the MK3, the common solution would be to disconnect the power panic wire from the PSU to the Einsy. However, on the MK4, disconnecting the power panic wire causes the printer to throw error 13321 on boot.
(I theorize that the xbuddy PCB omitted a pull-up resistor that was present on the Einsy.)
Describe the expected functionality
Ideally, Error 13321 / ERR_ELECTRO_ACF_AT_INIT would not be thrown on boot. It should be thrown when attempting to print and should not gate adjusting any settings on the MK4.
The check for the acFault should also be bypassable via a firmware setting allowing us to disable power panic.
Enter what type of printer or upgrade the enhancement applies to. Printer type - MK4, XL Optional upgrades - None
Is your suggested improvement related to an existing problem? Please describe.
The current buddy firmware checks the state of the power panic line during initialization and throws error 13321/
ERR_ELECTRO_ACF_AT_INITif the power panic line is disconnected. There is no way to bypass this in the firmware.https://github.com/prusa3d/Prusa-Firmware-Buddy/blob/56a40a0f776bb096468b47f52eb158e0afc84e08/src/common/power_panic.cpp#L62C1-L62C1
In this code, the
acFaultline is polled and checked to see if it isLO. If it isLO, Error 13321 /ERR_ELECTRO_ACF_AT_INITis thrown.This is fine for normal users, but if you have a UPS battery backup, power panic falsely trips when the PSU is switched over to battery backup. On the MK3, the common solution would be to disconnect the power panic wire from the PSU to the Einsy. However, on the MK4, disconnecting the power panic wire causes the printer to throw error 13321 on boot.
(I theorize that the xbuddy PCB omitted a pull-up resistor that was present on the Einsy.)
Describe the expected functionality
Ideally, Error 13321 /
ERR_ELECTRO_ACF_AT_INITwould not be thrown on boot. It should be thrown when attempting to print and should not gate adjusting any settings on the MK4.The check for the acFault should also be bypassable via a firmware setting allowing us to disable power panic.