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#66708 06/14/06 09:42 PM
Joined: Apr 2002
Posts: 257
M
Member
I bought a new meter today that has rotation indication. I've had them before but never knew what the letters R, S & T stand for. I know the phases by A, B & C.

#66709 06/14/06 09:51 PM
Joined: Feb 2005
Posts: 693
L
Member
R.T.F.M.*


*Read The Manual


Larry Fine
Fine Electric Co.
fineelectricco.com
#66710 06/14/06 11:53 PM
Joined: May 2003
Posts: 2,876
E
e57 Offline
Member
ABC = RST just a different set of letters for a sequence, I'll make the assumption that this is a Hotek or Hioki meter? And will also assume that the leads are red-white-blue, instead of black-red-blue?

Japanese made? Nothing wrong with that, I believe it will have the international symbol for clock-wise, of an arrow going 'clock-wise'.....


Mark Heller
"Well - I oughta....." -Jackie Gleason
#66711 06/15/06 12:42 AM
Joined: Jul 2002
Posts: 8,443
Likes: 3
Member
I believe that RST is a European convention,
they also used to use UVW as well.
I don't know a whole lot about the origins, maybe someone like Pauluk can clarify this?.
[Linked Image]

#66712 06/15/06 02:22 AM
Joined: May 2003
Posts: 2,876
E
e57 Offline
Member
Reminds me of that guy who wired a cord cap XYN, when it was suppossed to be XYZ. [Linked Image]


Mark Heller
"Well - I oughta....." -Jackie Gleason
#66713 06/15/06 05:39 AM
Joined: Dec 2001
Posts: 2,498
T
Member
That's old European designation. I believe the terminals of a motor leading directly to the windings were/are XYZ, the terminals fot the feeder are UVW, and going backwards in the alphabet, the terminals inside receptacles et cetera were named RST. Has been L1, L2 and L3 for some 20 years though, at least in Continental Europe. My school (built in 1975-1980) still has the old designations written everywhere. After all, it still has fuses instead of breakers too...

#66714 06/15/06 08:46 AM
Joined: Aug 2001
Posts: 7,520
P
Member
Yep, I remember seeing the RST designations on some older European equipment years ago. We never used that scheme in Britain: Everything was either A/B/C, L1/L2/L3, or R/Y/B, the latter being for our standard phase colors: red/yellow/blue.

#66715 06/16/06 04:23 PM
Joined: Apr 2001
Posts: 449
F
Member
Check out an Ideal 61-521 phase rotation meter. Red, yellow and blue phase indicator lights are also marked R, S, T. I never did know what RST stood for.

#66716 06/16/06 06:10 PM
Joined: Oct 2000
Posts: 2,723
Likes: 1
Broom Pusher and
Member
Larry Fine:

Quote

R.T.F.M.*


*Read The Manual

LOL!!! [Linked Image]

I remember it as:

"Read The Fu.... er... Funny,... ya that's it [Linked Image] Manual.

Scott35


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
#66717 06/16/06 07:30 PM
Joined: Dec 2005
Posts: 869
Likes: 4
R
Member
R, S, T are the older European indications for 3 Phase equipment.

RST are the 3Ø supply phases.
UVW is start, for star delta motor starting.
XYZ is run for polyphase motors.

Now been superseaded with L1, l2, L3


The product of rotation, excitation and flux produces electricty.
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