What does High DC Bus mean?

[travis]

What does High DC Bus mean?

Hello,
What is a "High DC Bus Alarm" in easy terms? Can someone provide a basic explanation or definition of a High DC Bus Alarm message and its possible causes. I'm looking for tips on troubleshooting this type of fault from the perspective of a electrical maintenance tech. Thank you!

• High DC Bus Fault
• High DC Bus Alarm
• High DC Bus Problem
• High DC Bus Message

[3rdshiftguy]

What does high DC bus mean?

As it states, the high DC bus error appears when the DC bus voltage is too high. This sometimes surfaces as an overvoltage fault (or overvoltage alarm). This can be caused by a few things.

• If the main DC bus voltage can be too high due to a power supply issue. This can be an internal power supply or an external supply that feeds a series of drives.


• The DC bus fault will also show up when there is an inadequately sized regenerative resistor (or wrong shunt resistor). This would be evident in the design phase of a project or after a mechanical modification was made to the equipment.


• The high DC bus alarm is also caused by an overload of the regen resistor due to excessive force when activating the regen circuit. This can be caused by stopping too fast or trying to stop too fast.

There may be other reasons for high DC bus errors but that is what I have seen.