View Single Post
  #19   Report Post  
Posted to uk.d-i-y
Fredxx[_3_] Fredxx[_3_] is offline
external usenet poster
 
Posts: 3,157
Default Inverter gone bang!

On 30/10/2020 12:12:10, Andy Burns wrote:
R D S wrote:

The Natural Philosopher wrote:

Worth checking motor phase resistances in case there is a short in
the windings tho...

There's no short to earth,

I'm unfamiliar with resistance settings on the multimeter but if I set
it to 200 and read between the phases it reads 23, and set to 2k it
reads .023
(which has confused me in itself)


they're the same number on different scales
one reading is saying 23 Ω,
the other is saying 0.023 kΩ, so 1000 x 0.023 = 23 Ω

presume you removed motor wiring from the VFD before measuring?

you need to measure all pairs of windings,
so from L1-L2, L2-L3, L3-L1

they should be more or less the same.


+1 before fitting any replacement inverter.