python program

[skystormfarms]

i was using a controller off the parallel port running a python program switching the speed of a 5 speed fan when the computer crashes and i look at the psu and i am getting an ac sine-wave along with the dc signal and extra 3v to on all lines how can this happen

[ratdude747]

Re: python program

could you translate that from gibberish to english?

I assume you speak more than just gibberish?

[shadow]

Re: python program

Seems to make sense to me.
However I am unsure why that would happen.

[dood]

Re: python program

could you translate that from gibberish to english?

I assume you speak more than just gibberish?

It's not gibberish, it's just a lack of punctuation. Add your own.

"I was using a controller off the parallel port (running a python program switching the speed of a 5 speed fan), when the computer crashes. I look at the psu, and I am getting an ac sine-wave along with the dc signal and extra 3v to on all lines. How can this happen?"

[Toasty]

Re: python program

Assuming a line voltage fan, yes?

Did the PSU fail and cause the system crash?

Is the AC present when the PSU is by itself? i.e.- Disconnected from system?

Did the controller isolation fail somehow? Would that allow AC back to the system?

Can you diagram the setup?

[skystormfarms]

Re: python program

well toasty the hard drive is toast it was a digital diagram on one 3TB drive only

[Toasty]

Re: python program

Ok

....and the other questions?

[skystormfarms]

Re: python program

yes a line voltage fan
yes the PSU fail cause the system crash
yes there was AC present on the PSU is by itself(Disconnected from system)
no it use magnetic relays

[kaboom]

Re: python program

Was this power supply plugged in when the pole transformer went kaboom?

The power supply you're talking about- does it power just the computer or does it also provide the control power? How are you interfacing the parallel port to the relay coils? Probably one bit per relay coil, via some 2N2222 transistors...

On your 5-speed line voltage fan, make sure your program is set to drop one relay before picking up another- don't want more than one speed tap energized at once.

Curious about the motor- multi-tapped shaded pole or PSC?

-Paul

[skystormfarms]

Re: python program

yes this power supply was plugged in when the pole transformer went kaboom
yes it drops one relay before picking up another
yes one bit per relay coil via some 2N2222 transistors
and its a multi-tapped shaded pole