14 Dec
2009
14 Dec
'09
12:07 a.m.
Hi Tony,
Six sensors....!
As far as I understand the documentation, the "outer limit" switch *IS*
crucial...! Huh... :-(
20V I *think*. I did not have the impression of overload. This
happened after about one hour of
operation. After many years... Gave some nice sparks.
-- Philipp
--
http://www.hachti.de
How does the
positioner find track 0?!?
It's all done with that optical transduce (the glass scale, the lamp, and
a couple (or is it 3) photodetectors under the carriage). IIRC it moves
the heads towards the spindle, then as soon as it gets a valid signal
from that transducer, it locks to it and calls it cylinder 0. Does it use
the end of range microswitch and then count? This is a bit
unclear to me.
AFAIK the microswitch is only used to disconnect the emergency-retract
battery when the heads are fully retracted. It's not part of the
positioner system, it wouldn't be repeatable enough. Did the drive work properly after re-fitting that
glass scale?
No *g*
But I don't know if this was the problem. Better: if this was ONE of the problemS. But
I assume that
I'll run in trouble with the sensors..
everything is
moving a bit. Last but not least, a PSU regulator failed
with great optical effects.
Which one? I am wondering if you have failed power transsitors on the
servo amplifier board that are overloading one of the power rails. Ma be
worth checking.