power measurements
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I made a power measurement for a 3 phase, whye connection, industrial
wave solder machine and obtained what I thought of as awkward data.
The power factor readings were as follows:
PF for L1 = -0.11
L2 = 1.00
L3 = 0.87
Is there an explanation for such a variation between each leg of a
single piece of equipment?
Thanks in advance
wave solder machine and obtained what I thought of as awkward data.
The power factor readings were as follows:
PF for L1 = -0.11
L2 = 1.00
L3 = 0.87
Is there an explanation for such a variation between each leg of a
single piece of equipment?
Thanks in advance
Comments
Original Message
From: "engrmaps" <engrmaps@y...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, April 17, 2003 4:33 PM
Subject: [noparse][[/noparse]basicstamps] RE: power measurements
> I made a power measurement for a 3 phase, whye connection, industrial
> wave solder machine and obtained what I thought of as awkward data.
> The power factor readings were as follows:
>
> PF for L1 = -0.11
> L2 = 1.00
> L3 = 0.87
>
> Is there an explanation for such a variation between each leg of a
> single piece of equipment?
>
> Thanks in advance
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
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>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
getting a -no load- on one phase means it is not connected. check
the fuses, it may be that one fuse is blown on that phase.
bet the motor is getting hot.
If you are deaing with a variable speed drive, test it at a frequency
above about 50 Hz. most amp probes are not designed for reading
lower frequencies.
Dave
--- In basicstamps@yahoogroups.com, "engrmaps" <engrmaps@y...> wrote:
> I made a power measurement for a 3 phase, whye connection,
industrial
> wave solder machine and obtained what I thought of as awkward
data.
> The power factor readings were as follows:
>
> PF for L1 = -0.11
> L2 = 1.00
> L3 = 0.87
>
> Is there an explanation for such a variation between each leg of a
> single piece of equipment?
>
> Thanks in advance
phase and ground.
Larry
Original Message
From: "Dave Mucha" <davemucha@j...>
To: <basicstamps@yahoogroups.com>
Sent: April 24, 2003 7:25 AM
Subject: [noparse][[/noparse]basicstamps] Re: power measurements
> sounds like the motor is single phasing.
>
> getting a -no load- on one phase means it is not connected. check
> the fuses, it may be that one fuse is blown on that phase.
>
> bet the motor is getting hot.
>
> If you are deaing with a variable speed drive, test it at a frequency
> above about 50 Hz. most amp probes are not designed for reading
> lower frequencies.
>
> Dave
>
>
>
>
> --- In basicstamps@yahoogroups.com, "engrmaps" <engrmaps@y...> wrote:
> > I made a power measurement for a 3 phase, whye connection,
> industrial
> > wave solder machine and obtained what I thought of as awkward
> data.
> > The power factor readings were as follows:
> >
> > PF for L1 = -0.11
> > L2 = 1.00
> > L3 = 0.87
> >
> > Is there an explanation for such a variation between each leg of a
> > single piece of equipment?
> >
> > Thanks in advance
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>