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When I first got the machine it
had the orignal analog SCR amplifiers (Indramat 3TRM2) for the axis drive
motors. Initially, the idea was to use a product called
Pixie made by Skyko that sits between Mach3 with its
digital step and direction interface and the analog
servo amplifier. The encoder feedback then goes to the
Pixie card which closes the position loop. This didn't
work out for two reasons...
First, the Pixies were
discontiued because the owner of the company found a
better paying job - can't blaim him for that. Second,
the powersupply for the SCR amps was a HUGH transformer
that runs on 400V single phase (well actually it's two
phases to get 400VAC but never mind) and since I want to
be able run it on an ordinary 16A outlet I wanted to
spread the load as evenly as possible across all three
phases.
So, I started to look for
a suitable
servo-drive.... The motors I got with the machine
is of the larger varity, at least when compared to the
average home CNC retrofit. The X and Y motors are rated
19A contionus and 150A peak while the Z motor is rated
24A continous and 200A peak.
The Z-axis motor, to the
right in the picture, is 484mm long and weighs in at a
hefty 29kg. The question was, what kind of drive do I
need to utilise these motors.
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