Hello to everyone. I have 2 ABB Robots in my hand.
MODEL IRB 6700
CONTROLLER IRC 5.
Both Robots are fed on the same power line.
Suddenly, both robots started giving DC link voltage too low warning.
Error Code 34401
When I measure the energy coming to the robots, the problem does not appear.
I turned off the main power and checked the Cables by hand, there was no slack.
Robots have different failure times, so I don't think it's a sudden energy surge.
And I don't think it's a cable problem either. Because this problem started suddenly, both robots could not have their cables loose at the same time.
The description of the fault is written like this in the technical manual.
34401, DC link voltage too low warning
In drive module arg, the drive unit at unit position arg has a DC
link voltage that is close to minimum limit.
Operation will be possible but the system is close to a stopping
The incoming mains voltage to the rectifier unit is out of
1) Check for other hardware eventlog messages regarding
mains voltage problem.
2) Check incoming mains voltage. Change the mains tolerance
min so that the mains voltage is inside the specified interval.
3) Check that the correct voltage is selected with jumpers on
the transformer (optional).
4) Check all internal 3-phase components (main switch, mains
filter, fuse, contactors) and cabling in the drive module.
I tried all the possibilities but couldn't fix the problem.
I am sharing a photo of the fault below.