28 Sep
2014
28 Sep
'14
1:58 p.m.
On Sep 28, 2014, at 12:00 PM, Bob Vines <bobvines00 at gmail.com> wrote:
Tony, et al.,
On your Rainbow H7842 PSU pinout you list pin #1 as ACOK H. Do you
know what monitors that signal?
Is it the AC side OK or the DC output OK? I'm guessing that it
monitors the AC side to ensure that the incoming "mains" voltage is
high enough to not damage the PSU. Is that correct? And nothing
monitors the DC output(s) for correctness?
I don?t know about the Rainbow. But in standard DEC usage, ACOK means ?AC voltage is
within spec, such that you should have good DC for at least x ms from now?.
ACOK is what drives power fail interrupts on machines that have them. If ACOK goes away,
the supply will put out good DC for a short while longer, long enough that the interrupt
handler can save some critical state before the CPU stops computing. It isn?t primarily
about power supply damage.
paul