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What worries me is that the SSR requires 4-8 Volt control input levels

A parallel port (the last time I looked) has TTL input/output levels 0-5Volts, but in reality you're looking at ~4.6V@0mA (no...

Linear supplies are bulkier (the heavy transformer required) and are less efficient (generate more heat loss) than a switching supply.
Switching supplies would generally be much cheaper for the same...

Take a photo of..
- underside
- topside
- off at 4 angles

There is nothing I cannot fix/replace/re-engineer
:cheers:

Make sure the photos are in focus!

The motor inductance (coil values) and phase shift capacitance starter, are probably tuned for 50Hz, max torque..etc.

So probably not - the higher frequency would result in higher 'resistance to...

Thanks!
I saw that, but the webpage wants me to register to download the pdf.
I'm trying to minimise my registrations and 'junk mail' received.
It is possible to transfer that idea to an all metal...

As mentioned it sounds like a light dimmer, configured for on/off operation.
Flourescent lights/ballasts change the supply voltage and current phases - This cooks the triac protection circuit, then...

Do you have a rough/basic circuit diagram to show ?
:)

Hmmm Paperclip... you and the other groups are being conned !!
What I suggest you do..

Before your group submits their work, register a preliminary patent on it, but do not tell your supervisors....

Hi all,
I've been talking to local people about cnc/lasers..etc, and been browsing the forums and other CNC related sites. Being new to the mechanical side of things there's a load of stuff for me...

Preliminary gloss over looks good, but the usual heatsinking story is left to the user...
When dealing with power, small packages are problematic without special considerations. This chip seems to...

That looks OK! assuming you're using only 3 motors - Is the transformer only powering the motors?

Forgot to mention that you'll have to experiment with the smoothing capacitors, that will absorb...

Some quick calcs..
- 80Vx6A drivers = 480W (VA)
- 3x drivers = 1440VA
A good estimate, say your motors consume at least half of this ~ 770VA

When they talk about VA ratings, take the real power...

It looks discontinued... If you google it you might be lucky,
:)

:banana:
:cheers:

The PIC internal pull ups are not to be relied upon under any circumstances, they're just too weak for most applications. I don't know why uChip bothered with these.

I don't see any direction...

Dingo, try get hold of either a users or technical manual on the compressor.

What you're probably currently looking at is the compressor motor connected for 'Star' 3-phase (you mention only 3...

That link goes to the 2SD1435 ?

An PNP does require the Base voltage to be -ve relative to the Emitter, to turn on. This does not mean that the base voltage has to be -ve wrt ground/0-volts. The...

You're probably looking for an 1-phase to 3-phase converter (The Inverters AC equivalent).
There might be a transformer based one, but these would be really heavy (the magnetics) but the most...

You should be able to smell this... it stinks when cooked :)

SMPSs usually rely on a voltage feedback for proper voltage control, and max current cutoff feedback. Connecting them in series is most probably messing up this feedback, and causing one or both to...

How did you 'remove' the signal from the gate.

If you physically disconnected the comparator output to the gate then this would leave the gate 'floating' in the ON state, and any noise on the...