On my machines the computer is powered by 120V single phase and is
independent of the 3 phase used for spindle, servo drives, etc.
The computer is powered up all the time so any movement is tracked.
Don't know if this is practical for everyone.
Well, I'm sure that's the way most people run their Fanuc-controlled
machines, the only time they are powered off is when the power goes out,
or they are being serviced.
Jon
you will find the controll will store the last known position into its
memory so when u turn it back on, it will use that value it stored, and
value from encoder to comepare where it "thinks" it is when it first
moves, so yes as you say it will be out if you move it while its off.
and it can be a pain to rehome and reset also
so you can turn a control off just fine, but leave it off for too many
months and you will have fun
as for homing fanuc do a grid shift, and do it as they move as well to
check for position
A GRID is based off the number of detection units per one motor
revolution. When the first marker pulse
is "seen" by the CNC system, a register is set up by the Reference
Counter Capacity parameter (see below).
As the motor turns and pulses are fed back to the CNC, the CNC "sets" a
Grid every time the number of
detection units which match the Reference Counter Capacity parameter
occurs. It is imperative that the
Reference Counter Capacity be equal to or a multiple of less than 1
motor revolution.
Therefore, the GE Fanuc CNC system does not reference an axis to the
marker pulse located on the
feedback device. The CNC systems reference the axis to a GRID set by the
Reference Counter Capacity.
if you have the Maintenance Manual it will tell you all you need to
know, for the 16i or above control.
rob
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