I think you probably have incoming voltage problems. Has anyone ever told you about changing the transformer taps at the bottom of the control cabinet to match your incoming line voltage and keep the DC bus between 320 and 340 volts.
The Haas tech who services my machines has stressed that going outside these limits is risky and can damage things. He said running too high can lead to overheat alarms and running too low can prematurely fry the elctronics.
You can see the DC bus voltage on the Diagnostics screen if you page down once (I think). Check it at different times of the day; your incoming voltage may fluctuate depending on the time of day.
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