On 6/25/24 16:24, Viesturs Lācis wrote:
otrd., 2024. g. 25. jūn., plkst. 17:17 — lietotājs Todd Zuercher via
Emc-users (<emc-users@lists.sourceforge.net>) rakstīja:
Hang on here, back up a bit. Start at the beginning. What is the input
voltage on the name plate for the entire machine? What voltage are you
feeding to the machine? For example if the machine's name plate calls for
400v, but you are feeding it 460v, that would explain having about 30v too high
voltage at the servo's transformer. Does the machine have a large transformer
in it similar to this that the main power goes through?
This got me curious and I checked what my multimeter thinks of mains
voltage. It was showing 405VAC where it is supposed to be 380VAC. And
I was thinking that this is multimeter error rather than entire
powergrid being 25V higher, but little search on web revealed that our
national standards require voltage tolerance of +/- 10%.
Within my lifetime since I wired the house my stepfather was building
for us at the tender age of 12, when the REA wired the country after
WW-II, the "std wall socket" voltage delivered from the pole pigs that
feed our houses, has risen from 110 volts, to 127 volts, each time paid
for by the shortening of the life of our incandescent light bulbs. So
the "220" grounded center-tap drop feeding our services now reads 254 if
your meter is accurate, not the 220 in the vernacular. In case anyone
wonders, the life of an incandescent light bulb is determined by the
13th power of the applied voltage. Your trivia factoid for the day.
Hope for the best, plan for the worst - Peter, what do you think about
rectifying 232VAC 3-phase for 8i20?
That, not allowing for rectifier losses, would be 327 volts. Peter
possibly would have some other considerations.
Viesturs
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