Siemens 7SA513 - Page 99

0HWKRG RI RSHUDWLRQ6$
9
&*&
6$ SURYLGHV D VHOHFWLRQ SURFHGXUH ZKLFK FDQ
LPSURYH VHOHFWLYLW\ GXULQJ VLQJOHSROH DXWRUHFOR
VXUH LQ WKRVH FDVHV ZKHUH QR WHOHSURWHFWLRQ PRGH LV
DYDLODEOH RU XVHG 8

SURFHVVLQJ SDUDPHWHU 
$ SUHUHTXLVLWH LV WKDW WKH YROWDJH WUDQVIRUPHUV DUH LQ
VWDOOHG DW WKH OLQH VLGH DV VHHQ IURP WKH FLUFXLW EUHDN
HU
:KHQ D VLQJOHSKDVH VKRUWFLUFXLW RFFXUV QHDU RQH
HQG RI WKH OLQH HYHQ WKH QHLJKERXULQJ OLQHV DUH
WULSSHG DW ILUVW EHFDXVH WKH\ UHFRJQL]H WKH IDXOW LQ
WKHLU RYHUUHDFKLQJ ]RQH =% UHIHU )LJXUH  ,I
WKH QHWZRUN LV LQWHUFRQQHFWHG DQG WKH EXVEDU % LV
ILWWHG ZLWK DW OHDVW RQH HDUWKHG WUDQVIRUPHU ZLWK D
GHOWD ZLQGLQJ WKH YROWDJHV ZLOO EH V\PPHWUL]HG
WKHUH 7KXV GLVWLQFWLRQ FDQ EH PDGH EHWZHHQ WKH
IDXOWHG OLQH DQG WKH XQIDXOWHG OLQHV DIWHU GLVFRQQHF
WLRQ DW WKH ORFDWLRQV , ,,DQG,,,
6LQFHOLQH%&LVLQWHUUXSWHGDWRQHHQGRQO\DUH
YHUVH YROWDJH DSSHDUV IURP WKH QRQLQWHUUXSWHG OLQH
HQG % 7KXV WKH LQWHUUXSWHG SKDVH FDUULHV YROWDJH
DJDLQ 7KHUHIRUH WKH ]HUR VHTXHQFH YROWDJH PHD
VXUHG DW WKH UHOD\ ORFDWLRQ ,,, LV YHU\ VPDOO ,I WKH UHOD\
DW WKLV ORFDWLRQ UHFRJQL]HV WKLV LW FDQ UHFORVH LPPH
GLDWHO\ RU ZLWK RQO\ D VPDOO GHDG WLPH ZKLFK PD\
FRYHU WKH YROWDJH PHDVXULQJ WLPH 7KH KHDOWK\ OLQHV
DUH LQ RSHUDWLRQ YHU\ VRRQ E\ WKLV SURFHGXUH
/LQH $% KDV EHHQ LQWHUUXSWHG VLQJOHSROH DW ERWK
HQGV 7KXV D VLJQLILFDQW ]HUR VHTXHQFH YROWDJH LV
SUHVHQW ZKLFK LGHQWLILHV WKLV OLQH DW ERWK OLQH HQGV DV
WKH IDXOW\ OLQH 7KH QRUPDO GHDG WLPH IRU VLQJOHSROH
DXWRUHFORVXUH EHFRPHV YDOLG
)XUWKHUPRUH 6$ SUHVHQWV WKH SRVVLELOLW\ WR WULS
D SHUVLVWHQW IDXOW LQVWDQWDQHRXVO\ RYHU   OLQH
OHQJWK HYHQ DIWHU XQVXFFHVVIXO DXWRUHFORVXUH
6LQFH OLQH $% KDV EHHQ LGHQWLILHG DV WKH IDXOWHG OLQH
E\ WKH PHWKRG SUHYLRXVO\ GHVFULEHG WKH RYHUUHDFK
]RQH FDQ UHPDLQ HIIHFWLYH HYHQ DIWHU XQVXFFHVVIXO
DXWRUHFORVXUH VR WKDW D SHUVLVWHQW IDXOW FDQ EH
FOHDUHG LPPHGLDWHO\ HYHQ DW OLQH HQG ,
$GGLWLRQDOO\ GLIIHUHQW GHDG WLPHV FDQ EH VHW DW ERWK
OLQH HQGV VR WKDW RQH HQG  HJ DW WKH ORFDWLRQ ,  L V
UHFORVHG DW ILUVW ,I UHFORVXUH KDV EHHQ VXFFHVVIXO
WKHQ WKH KHDOWK\ YROWDJH LV SUHVHQW DOVR DW WKH RWKHU
OLQH HQG ,, VR WKDW WKH ]HUR VHTXHQFH YROWDJH LV YHU\
VPDOO WKLV OLQH HQG FDQ EH UHFORVHG ZLWK D VOLJKWO\
KLJKHU GHDG WLPH ,I WKH IDXOW KDV UHPDLQHG XQ
VXFFHVVIXO DXWRUHFORVXUH LW FDQ EH LQVWDQWDQHRXV
O\FOHDUHGDWOLQHHQG,DWOLQHHQG,, D VLJQLILFDQW
]HUR VHTXHQFH YROWDJH UHPDLQV EHFDXVH RQH VLQJOH
SROH RI WKH FLUFXLW EUHDNHU LV RSHQ UHFORVXUH LV
EORFNHG 7KH FLUFXLW EUHDNHU SROHV ZKLFK DUH VWLOO
FORVHG FDQ EH WULSSHG E\ WKH SROH GLVFUHSDQF\ SUR
WHFWLRQ RU E\ 6$ LWVHOI 7KLV PHWKRG E\ WKH ZD\
VDYHV WKH FLUFXLW EUHDNHU DW ORFDWLRQ ,, EHFDXVH WKLV
&% QHHG QRW VZLWFK RQWR WKH IDXOW DJDLQ
7KH VHWWLQJ SDUDPHWHUV IRU WKH DXWRUHFORVH IXQF
WLRQV DW ERWK OLQH HQGV GHWHUPLQH DW ZKLFK OLQH HQG
WKH EUHDNHU LV UHFORVHG ZLWK QRUPDO GHDG WLPH ZLWK
RXW ]HUR VHTXHQFH YROWDJH FKHFN DQG DW ZKLFK OLQH
HQG WKH ]HUR VHTXHQFH YROWDJH LV PHDVXUHG WR GH
FLGH ZKHWKHU UHFORVXUH WDNHV SODFH ZLWK D VOLJKWO\
KLJKHU GHDG WLPH RU QRW
=%
=
$
%
&
=%
, ,, ,,,
$ % & EXVEDUV
,  ,,  ,,, 5HOD\ ORFDWLRQV
; WULSSHG FLUFXLW EUHDNHUV
)LJXUH  ([DPSOH IRU WKH 8

SURFHGXUH
www . ElectricalPartManuals . com