On 12/30/2015 11:45 PM, Mike Ross wrote:
Thanks for the thought... my main concern is the System/3s and Henk
Stegeman - who has forgotten more than most of us will ever know about
S/3! - says that 60Hz S/3 on 50Hz power is a no-go. Different voltage,
fine - transformer can be restrapped. Different frequency... trouble!
And then there are rotary machines of course. I bet you half my disks
drives need the right frequency or a spindle pulley change.. and even
then *they* probably have ferroresonants in their power...
Mike
Order a boatload of 8kw honda generators? I think you could get 40 amps
out of them. Any reason the power has to be in phase?
I know for the mainframe power that might not be high enough, but on
smaller machines it would take care of the problem.
thanks
JIm
On Thu, Dec 31, 2015 at 6:37 PM, William Donzelli <wdonze...@gmail.com> wrote:
I bet you (or Mike, actually) could get it to work by trial and error,
swapping in caps. The transformers (generally) are apparently pretty
forgiving - being off in frequency just results in lost efficiency,
maybe 10-15 percent lost at most. Not flames, anyway.
--
Will
On Thu, Dec 31, 2015 at 12:30 AM, Guy Sotomayor <g...@shiresoft.com> wrote:
On 12/30/15 9:29 PM, William Donzelli wrote:
Of course! Find the exception that proves the rule!
;-) However, it would've been nice if it were only necessary to change
the capacitor!
TTFN - Guy
--
Will
On Thu, Dec 31, 2015 at 12:23 AM, Guy Sotomayor <g...@shiresoft.com> wrote:
On 12/30/15 9:06 PM, William Donzelli wrote:
Sorry about digging up a slightly stale thread...
I haven't done any troubleshooting yet but checking the manuals on
Bitsavers tells me my US 3278s have ferroresonant transformers
specified as 120V 60Hz only. This can be expected to cause problems
with 120V 50Hz here in NZ from my knowledge of how ferroresonant
transformers work; I'll get excessive magnetic currents - overheating
- all kinds of nasties. I can wind the voltage down a bit and run them
at 90-100V but that doesn't help much.
...but straight from the horses mouth, most IBM ferroresonant
transformers will work at 50 or 60 Hz. The capacitor may need to be
swapped, depending on the equipment.
I was hanging around some IBM old timers this evening, including the
Big Horse at Endicott.
I just looked up the FE manual for the 3278 and it shows 5 different part
numbers for the
ferroresonant transformer (depending upon region) and only a single part
number for the
capacitor.
TTFN - Guy
