11 May
2006
11 May
'06
4:34 p.m.
Tony, responses to your statements are below, but as a general question to
those who are helping me with this, is the H745 light supposed to come on if
it's just connected to the power distribution board? i.e. am I supposed to
se a light on with no load like the H7441s do?
Yes, you are. The lamp is simply connected across the output of the
regulator -- that is between the output line and ground. It'll light up
if the regulator is working.
Now, you
should see 20-30V _between the 2 wires going to a
particular regulator_. Not between either wire and earth.
This could explain my reading. I was only measuring one wire at a time. Not that it matters, but the thing that got me started
on this path is that
the H745 has two pins, who each say "20-30VAC"
Yes, it's somewhat confusing. It means you need to connect 20-30V AC
between those 2 pins. The printset should show how the transformer is
connected (note that there are no connections to the secondary windings
other than to these regulator bricks, there are no grounds, no taps
connected to ground, etc). And the prints of the regulator should justify
_why_ you connect it like that. From what I remember, those to pins go
to the AC terminals of a bridge rectifier, the output of which goes to a
large smoothing capacitor. And at least for the +5V brick, one side of
that capacitor is then grounded.
contactor and
its control supply. Is it possible that you
have a 230V unit plugged into a 115V mains socket?
I highly doubt this as the AC input box is clearly marked 120V. Wow, OK, so what is it then? This really has me
stumped.
Is it still possible I have an input box problem?
See above. I don't think there's anything wrong with the PSU at all. Just
that you're not measuring the voltage you think you're measuring.
-tony