| Author |
Message |
Watson A.Name - \"Watt Su
Guest
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 Posted:
Thu Jun 02, 2005 1:36 pm Post subject:
Re: Power Canadians Use? |
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"Chuck Harris" <cf-NO-SPAM-harris@erols.com> wrote in message
news:0J-dnR27_-0eawDfRVn-1A@rcn.net...
| Quote: | Watson A.Name - "Watt Sun, the Dark Remover" wrote:
But nowadays, with the variable speed controllers, couldn't the
motor
just be fed the pseudo sine wave that 'looks' like 25 Hz to the
motor.
Of course that might be more expensive than rewinding or just
replacing
the motor with a 60Hz one. And one other thought. If the 25Hz
motor
would run on 60Hz, but at a higher speed, then change the pulley to
a
smaller size.
A motor controller certainly could be used today, but not back in the
'60s.
Back then, they were either motor/generator units, or rather big SCR
based units. Quite noisy, both electrically and sonically, and
very expensive. The labor of a technician was cheap in comparison...
though they can be rather noisy too ;-)
...
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Noisewise, _nothing_ could he worse than the controller that's on one
bldg at work. The big air handler motor is next door to the telephone
room where I have to work, and at certain times, the Danfoss controller
is feeding that motor what sounds like a million elves inside, each with
a tiny hammer plinking on a small steel anvil. This screaming, ringing
sound makes it difficult for me or any of the telephone co techs to hear
the tone tracer to trace down a pair of wires.
And then I've found that tracing wires next to a fluorescent light can
be a whiny experience with the new electronic ballasts they use. :-O
[snip]
> -Chuck Harris
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Michel Catudal
Guest
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| Posted:
Sat Jun 04, 2005 4:35 pm Post subject:
Re: Power Canadians Use? |
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Watson A.Name - "Watt Sun, the Dark Remover" wrote:
| Quote: | I've been checking my HP 3478A and I found that there is a black dot in
the 240VAC bubble on the back. However it seems to have been switched
internally to 120VAC. But one of the DIP switches was still set to 50
Hz, so they forgot to do both. On the top there is a yellow "electronic
instrumentation" sticker with a serial no. (calibration?) that has the
CSA logo and says printed in Canada in both English and French, which
leads me to believe that it was originally sold to a Canadian company.
So my question is, do Canadians have 240VAC 50Hz power? I kind of
thought that since they seem to be tied into the North American power
grid, they were also 60 Hz, even if they may still use 240VAC. Or are
there "renegade" areas in Canada that still have European power
standards?
BTW, it seems to be working okay. But I gotta make up some decent
shielded test leads.
|
As an other person said it is the same as in the USA except for the
higher voltage.
Being tested by CSA doesn't mean that is is used in Canada. It just means
that the manufacturer wants to seel the product in Canada and not having
his product banned.
Usually if you have a product that is certified CSA, it is more secure
than an product only certified by UL because CSA is much stricter.
There are exceptions though and we can call that bribes. A few years
back (in Buffalo) we had a call from someone at an hospital saying
that a transformer in one of our microscopes caught on fire. I found
that odd because I would do the strict CSA test on them and there was
no way that would happen. I would never had let that go to production.
We were certified by CSA to do the test in house.
I took one identical microscope and did the output short circuit test
on the transformer and it caught on fire and had toxic fumes.
Normally the transformer is supposed to open somewhere so the power
is cut.
In Canada is is illegal to sell products that are not CSA (ACNOR)
certified.
The company had started to outsource to China. The microscope had
CSA and UL stickers. Thinking that something illegal was going on
I called CSA in Toronto (Canada) and was told to mind my own business.
These people at CSA are so strict so I was stunned that this occured. For
me when a product comes from China, the UL or CSA sticker doesn't mean
shit.
--
Tired of Microsoft's rebootive multitasking?
then it's time to upgrade to Linux.
http://home.comcast.net/~mcatudal
We are the Cybernetic Entomology Experts |
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Spehro Pefhany
Guest
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| Posted:
Sun Jun 05, 2005 12:31 am Post subject:
Re: Power Canadians Use? |
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On Sat, 04 Jun 2005 10:03:53 -0500, the renowned Michel Catudal
<mcatudal@__comcast.net> wrote:
| Quote: | These people at CSA are so strict so I was stunned that this occured. For
me when a product comes from China, the UL or CSA sticker doesn't mean
shit.
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It's more likely to be valid when you cross-check the file number
(there has to be a file number) with CSA or UL and make sure that
a) It's actually a valid number
b) It actually has something to do with the particular company
c) It actually refers to the product line that you found the
sticker on
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
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