2 Apr
2005
2 Apr
'05
3:15 p.m.
The DG drives have the same system, a N.O. relay with a huge cap
yanks the linear motor home, should power fail. ANd there's the
DEC used a little NiCd battery pack, an NC relay contact (in other words,
closed when the relay was de-energised, it was normally energised when
the drive was in operation so that the contact was open then) and a
microswitch that opened when the positioner was fully retracted. At least
on the RK05...
The RK07 had something similar, at least there's a NiCd pack clipped
under the chassis.
Didn't some winchesters use the spindle motor as a generator to provide
the emergency retraction current?
-tony