Dc bus fault

The VSD Fault G1F032 on an Ingersoll Rand 110 kW VSD (variable speed drive) likely indicates an issue with the drive's DC bus. This fault code indicates that the DC bus voltage has dropped below the acceptable range, which can cause the drive to trip or shut down.
Here are some steps you can take to troubleshoot this fault:

1. Check the incoming AC voltage to the drive to ensure that it is within the acceptable range. Low voltage or voltage fluctuations can cause the DC bus voltage to drop below the acceptable range.
2. Inspect the DC bus capacitors for signs of damage or leakage. Damaged or faulty capacitors can cause the DC bus voltage to drop and trigger the fault code.
3. Check the connections between the DC bus and the drive's power modules. Loose or faulty connections can cause voltage drops and trigger the fault code.
4. Check the drive's cooling system, such as the fans or heat sinks, to ensure that they are operating correctly. Overheating can cause the DC bus voltage to drop and trigger the fault code.
5. Consult the drive's manual or contact the manufacturer for additional troubleshooting steps or assistance.

It is important to take caution when working with electrical components and ensure that any modifications or repairs are done by a qualified technician.

https://repairpal.com/obd-ii-code-u0073-control-module-communication-bus-a-off

https://www.snapon.com/EN/US/Diagnostics/News-Center/CAN-Bus

https://www.obd-codes.com/u0073

Dc bus error is from charger o maybe inverter

If your batteries are ok a DC BUS fault and low o/p voltage means one of the componants inside is defective. An end user can not effect repair. You need to have it looked at.

its busted by the sounds of it so unless you add more detail thats all I will give as an answer

If the display works fine when connected to external screen via VGA connector then then the problem is either with the LCD display panel ( which consists of the display panel and inverter ) or the LCD cable that connects the LCD to the motherboard. You could try to re-seat the cable connection on the back of the LCD panel.

The problem comming from Prag board and zogh board. replace both card to solve the problem.

radioactivet, A qualified technician will need to investigate the units "switch-mode-power-supply" for typical "faults" and locate the faulty (bad) component(s) that ma be causing monitor to act this way. "Noise" on the +5 volt DC rail going to the vga/lcd interface (processor) may be why display is acting "strange" with uncalled for pop-up's appearing!! That's the very first place I would investigate when dealing with ANY COLD-CATHODE-FLUORESCENT-LAMP, BACK-LIT LCD DISPLAY. 12fixlouie

I removed the usb-card. Things work perfectly again.

I had a DC bus fault error displayed.

So I unplugged battery, then turned on UPS. It said Batt disconnected of course.

So when I plugged in the batt while the UPS was on, and held the power button for a few sec, the UPS displayed Batt testing.

After a few moments it was back online and had no faults!

Worth a shot.