Inverter Failures related to Voltage Sags?

[QBall6]

What is the lowest voltage an inverter can handle on a three phase system (460VAC) before it starts to fail?

I have recently seen more and more inverter failures and I believe it is related to our incoming power. I need to know how low can the voltage drop before it fails.

 

[jpolson]

How are they failing? Capacitors blowing? Have you verified that the phases are balanced?

Joel Olson

 

[jpolson]

I should have mentioned in the previous post that most inverters have a "low voltage" fault that will protect the drive. So I would hesitate to blame it on low voltage.

Joel Olson