8 Mar
2005
8 Mar
'05
4:54 p.m.
From: ard at p850ug1.demon.co.uk
Hi
I looked at the manual for the SA800/801 and the +24V is used
for the stepper and head load but it is also used for some
of the electronics. Where the exact voltage is critical, there
is a zener. It would nost likely work anywhere +- 2 or 3 volts.
Dwight
Be sure to check the labels on the stepper motor.
Some years ago I had a
brief "aquintance" with a SSSD drive from Control Data. I binned it
immediately, as it showed that the steppermotor needed 115VAC !
Never! I've enver seen am 8" drive with anything but a 24V stepper motor.
The spindle motor is often mains powered (and often 115V, to be powered
by an autotransformer if you have 230V mains). It's a capacitor-run
induction motor, and you generally have to change the pulleys (and maybe
the belt) when going between 50Hz and 60Hz mains, to get the spindle
speed right.
My P851 and P854 systems have CDC floppies (and I have the CDC service
manual for them). They have 24V steppers and AC-line powered spindles.
-tony