I thought this would be interesting to show.
Yesterday attended a VRV and here is what I found.



Nice huh.!!

Check out the capacitors


I need to rewind the inductors though....any idea how should I go about it ?

 

What's a VRV?

 

helluva bang there and looks like one of the slow blows is out as well

i'd also be looking at the motor

edit: vrv - https://www.google.com.au/?gws_rd=ssl#q=VRV

 

I tried Google but it didn't look relevant....

 

is a Vrv an air conditioning unit...

 

Google says yes but since the OP "attended a VRV" it could be something else.

 

I think he meant "attended to", as in worked on or tried to repair or something like that.

ak

 

I am fixing an AC unit. VRV type, which the compressor unit is on top of the building.
It is an inverter type.

helluva bang there and looks like one of the slow blows is out as well

Is it a slow blow a quicky. I cannot tell from the part number. It does not state it as a slow blow.

i'd also be looking at the motor

U mean the compressor ??

 

was under the assumption sand filled fuses were slow blow and with a 20a rating, startup would be pulling close to that.

is there a motor attached to that compressor?

 

The compressor is 3 phase motor. You know inverter drive the VFD type.
The only surge will be the caps initial charge current I think

 

I have question about the inductor winding.
The inductors are for EMI filtering.
Each one has 4 isolated winding, 1 for each phase and 1 for neutral. 4 in total. Both inductors are in series.
I need to wind just one. I unwound one and it has 15 turns. Due to the winding is I cannot tell the start or end but I know the direction.
What would happen if I get confused in start and end of the winding ?
Should all the winding be same direction or not ?

 

If you have not already removed the wire from the core, you can merely note the directions of the windings with respect to one-another.

 

I guess It's fair to tell this VRV is fixed and running now

 

That's what the electronics fairy does. She waves her magic wand over a circuit and it goes poof I'm a pile of s**t.

 

is a Vrv an air conditioning unit...

It certainly seems to have got well stuck into venting things.

 

I have question about the inductor winding.
The inductors are for EMI filtering.
Each one has 4 isolated winding, 1 for each phase and 1 for neutral. 4 in total. Both inductors are in series.
I need to wind just one. I unwound one and it has 15 turns. Due to the winding is I cannot tell the start or end but I know the direction.
What would happen if I get confused in start and end of the winding ?
Should all the winding be same direction or not ?

If you were a radio ham making an RF balun, you'd do a bifilar or trifillar winding by twisting 2 or 3 wires together and wind them on as if it was just one wire - but I suspect you'd run into insulation problems doing that with 3 phases and earth.

You may be able to get PTFE wire, the insulation is good enough to be thinner and still do a lot better than enamel coating.

 

I did say it is working now.