David,

Here are all three tach adapters finished machining. Took about 8
hours per adapter.

I was rather surprised to see two contactors wired in parallel. It
appears to be the 3 phase for the knee motor. That huge motor can
probably lift 500 or 600 pounds.

I guess back when the Kasuga was built they did not have contactors
with enough current.

"A contactor is an electrically controlled switch used for switching
an electrical power circuit, similar to a relay except with higher
current ratings and a few other differences A contactor is
controlled by a circuit which has a much lower power level than the
switched circuit."


I have a new invention I will upload shortly for simplifying some of
this rat's nest :-)

Paul Lamar


Looks great. I switched to solid state relays, use 5vdc data to
control, no contractors to have carbon Build up or wear out.

David Mikesell San Jose California

Is the idea to turn off all circuits if a limit switch opens some
where?

So all limit switches are in seres? What would the schematic look
like?

I am thinking of a Maxmite and a LED panel that tells you which limit
switch opened.

Or is that feature built in EMC ?  Is it in Mach 3 ?


Paul Lamar

You can put all limit switches in a series So if  anyone of them
opens it goes into e stop, or if it's in homing it takes that as a
limit to whatever axis was moving. It works that way in mach3 also
EMC. I personally wire each one individually as an individual home
switch and it also acts as a limit switch. And then I use software
driven soft limits while running to make sure I never actually hit
the switch when the machine is moving.

David Mikesell San Jose California

Thanks David

I'll  think about that so more.

What is the limit switch voltage?


Paul Lamar

It's a 5vdc logic circuit.

David Mikesell San Jose California


I guess that is the reason some of the Kasuga docs I have recommended
 running the limit switch wires in separate conduit. Unfortunately it
was NOT adhered to on this original installation. But I will fix that
and run them in separate conduits.

I am guessing but that would partially explain the dozens of
capacitors used on all the high voltage wires.


Thanks David

Paul Lamar

Paul,

You should also used shielded two strand twisted wire for the limit
switches. You can get false signals from other wires, encoders should
also be shielded to prevent errors.


David Mikesell San Jose California



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