Toroid transformer no ouput

[Clive S]

Alright, just got the digital meter. Here is what I measured:

Primary 230V: 0 ohm resistance
Secondaries:
red+black = stable 5 ohms, peeks at 20-40 ohms (probably due the the meter ?)
orange+yellow = stable 5 ohms, peeks at 10-30 ohms (again, most likely due to the meter)
red+orange = 0 ohms
black + yellow = 0 ohms

Verdict ?

EDIT: @Graeme
I had not set up a fuse for the transformer. I only have fuses between the drives and the screw terminals.

OK with the absence of Greame to save you time I think you are reading the meter incorrect in that the primary is open circuit ie infinity resistance and not 0. Does the meter have a continuity range? (ie if you short the meter leads together to make a buz) . if so does it buz when you connect it across the primary?
So you will have to send the transformer back.

[eurikain]

Yes it does have such a position :) Let me check :))

[eurikain]

Touching the meter pins together creates beeeeeeep.

Primary:
no beep

Secondary:
red+black = beep
yellow+orange = beep
red+orange | red+yellow | black+yellow | black+orange = no beep

[Clive S]

Touching the meter pins together creates beeeeeeep.

Primary:
no beep

Secondary:
red+black = beep
yellow+orange = beep
red+orange | red+yellow | black+yellow | black+orange = no beep

That confirms it the primary is open circuit so see if you can send it back under guarantee.
What you have done is put a dead short across the secondary and burnt the primary out. Next time put a fuse in.
Its called a learning curve so don't get disheartened.

[eurikain]

:'( Oh well.. I will call rapidonline tomorrow morning, see what we can do.
Where am I supposed to put that fuse you are talking about ? Can you show a wiring diagram ? How many amps does it need to be ?

[Graeme]

Have a read throught this http://www.mycncuk.com/threads/9268-...se-Spindle-VFD. Message #46 gives a good diagram for all the electrics and shows where to put fuses or MCB's. One nice thing about the UK is we have fuses in our mains plugs, so if something goes wrong there is generally a fuse that will blow before any major damage is caused.
Because you are using a torroidal transformer, the inrush current (how much current is taken when you first apply mains power) can be many times the rated current of your transformer. You may have to use a bigger fuse than you think, but also be carefull to not go too far as you could cause damage if you do get a short.
Can I also make a suggestion to you. The wires from the transformer to the rectifier and to the capacitors should be much shorter and more heavy duty - at least the same wire size as the transformer wires.

[eurikain]

Have a read throught this http://www.mycncuk.com/threads/9268-...se-Spindle-VFD. Message #46 gives a good diagram for all the electrics and shows where to put fuses or MCB's. One nice thing about the UK is we have fuses in our mains plugs, so if something goes wrong there is generally a fuse that will blow before any major damage is caused.
Because you are using a torroidal transformer, the inrush current (how much current is taken when you first apply mains power) can be many times the rated current of your transformer. You may have to use a bigger fuse than you think, but also be carefull to not go too far as you could cause damage if you do get a short.
Can I also make a suggestion to you. The wires from the transformer to the rectifier and to the capacitors should be much shorter and more heavy duty - at least the same wire size as the transformer wires.

Thank you very much for the link and for the suggestion. I will unsolder everything and switch to bigger wires. I was using typical 230V wires and did notice that they were a bit thin but they are the same size as the input 230V on the transformer. I'll do that again next week and post back here.