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| Looking for transients in 600V 3 phase system, need opinions |
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| Sterno:
Not sure this is the right place for this... Having an issue with a VFD repeatedly blowing it's input side guts all over the control cabinet and everyone I have asked is as dumbfounded as I am as to why. 60Hz, 610V - 612V measured phase to phase. VFD is rated for 500-600V +10% / -15% Power comes from electrical room through a disconnect, circuit breaker, and line reactor to the VFD. The motor connected is a 1.5Hp conveyor belt unit, draws 0.3 A when running. A pair of soft starters for 30hp pumps are also tied into the disconnect and seperately fused, zero trouble with those bad boys. I'm suspecting transient spiking/surging in the building but do not have access to a power quality analyzer such as the Fluke 435. I was contemplating using my DS1054 and a B&K PR2000B high voltage probe, setting up a pass/fail envelope test and letting it run. Can this be done safely or am I suicidal for even thinking of doing this? Any other economical ways of measuring/logging this? Thanks |
| NiHaoMike:
How far is the motor from the VFD? How far is the VFD from the source? I'm assuming it's very long since I see little other reason to use such a high voltage at that low power level. Could be standing wave issues. |
| langwadt:
a few small transformers in series so they run at a bit lower than rated voltage ought to give a reasonably linear isolation |
| Circlotron:
--- Quote from: Sterno on July 03, 2019, 11:22:42 pm ---Power comes from electrical room through a disconnect, circuit breaker, and line reactor to the VFD. --- End quote --- If the VFD suddenly stops pulling current, could the line reactor be giving the VFD input an inductive kick? |
| T3sl4co1l:
What regulations is the VFD rated for? In particular, high-line and surge ratings would be of interest? Tim |
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