direct on line starter _ electrical notes & articles
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Electrical Notes & Articles
Sharing Abstracts,Notes on various Electrical Engineering Topics.
Direct On Line Starter
MARCH 13, 2012 50 COMMENTS (HTTP://ELECTRICALNOTES.WORDPRESS.COM/2012/03/13/DIRECT-ON-LINE-STARTER/#COMMENTS)
Introduction:
Diff ! " $ %! i"& ' *$ %! '+ * ! $ %! i"& i"* i " ' !$ % $ I"* i " M !*!% $ ' ! $ %! i"& !! " * !i"& $ %! i"&. T +! " *%'%& i"*i"&$ * i&$ %! i"& !! " 4 , '+ *iff ! " + $ $ %! !$.T $i'+ $ !' ' ! $ %! ! ! i"* i " ' ! i$ Di! O" Li" $ %! !. T DOL$ %! ! "$i$ % MCC ! Ci! i ! %6 !, C " % ! %"* %" ! %* ! % ! +! i ".E ! '%&" i " % ! i %" + " * !'% ! %* ! % "* ! %
"*i i "$.T +i % , " % ! i " ! * $ +%!% $ %! %"* $ + 7 "$, %"* %" %
" % " " % ! i$ $ *, % ! $$ $ %! 7 ", %$ % * i" " % . I. . "!i % % * $ * i ' ! i$ + !% i"&.
Principle of DOL:
T $ %! , " % ! i$ $ *, %++ i"& i" %& ' ! i"*i"&$. T '*!% % ! i& i"! $ !! " ! % ! $ ! i' , '%&" i 9 * i" i! ", %"* "
!! " i i'i * L 6 * R ! C !! " ' !. T ' ! i * + L 6 *R ! T ! %"* &i" % !% %!*$ $+ *.A$ ' ! % !% $, !! " i &i" *! +, i " *! + $i&"i9 %" " i' ! i$ % % i& $+ *, +i % % ;5< $ " ! " $ $+ *. T % % $ %! i"&
! i$ % " i " ' ! * $i&", %"* !'i"% %& , %"* i$ % i"* + "* " ' ! %*.T ' ! %* i %ff i' %6 " ! ' ! % !% $+ * %"* * !% i " i& $ %! i"& !! " , " '%&"i * $ %! i"& !! " .P! i* * ! * + * ' ! 8 *$ %* ! % % $+ *$ * !i"&
, ' ! i ! % $+ *. I ! * i ! * ' ! i$ $$ %" %* % %" $+ * * !i"& $ %! , ' ! i $ +$ % !% i"&. I ! i % DOL $ %! ! i$ i"$ = i " ! %*, ' ! ' $ ! + % * i % ' !
A $ %*$ ( 7+:// ". !*+! $$. '/% - $ -%*$/)
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i %" * + % i& ! $ %! i"& ! .T % !% i " ! i$ ! * + * ' ! 'i" $ %* ! , %"* i
%"& %$ ' ! % !% $ * ' ! $+ * ! ! %"* %* $+ * ! . T $ %! i' i$ * + "* " " % !% i " ! %"* %* i" ! i%.
DOL starting have a maximum start current and maximum start torque. T i$ '% % $ %"!i % +! ' i $ ++ , ! i '% % $ % ' %"i % +! ' i *!i " %*
i$ i i" " "i " ! $ !$ $ ++ i" , % % $ 8+ !i " % %& *! +
$ %! i"& % ' !. i i$ ' ! i$ " % i& + ! " i * $ " %ff ' .
Parts of DOL Starters:
(1) Contactors & Coil.
M%&" i " % !$ %! ! '%&" i % + !% * $ i $ % +! i* % $% %"*' %"$ ! "" i"& %"* i" !! + i"& !%" i! i $.M%&" i ' ! " ! !$ $ ! '%&" i " !& ! $i"& $ i $. T ! '%&
"$i$ $ % i i! + % * " %" i! " ! . W " % !! " 4 ! & i , i! '%&" ' $ '%&" i> *, %7!% i"& %" i! " %! % * %!'% ! . A" i" !! + i " !! " 4 ! & i i! % $ $ %!'% ! *! + * +! $ "
%" %i! &%+ i" '%&" i i! i .
( 7+:// !i % " $.9 $. !*+! $$. '/2012/03/1.+"&)
Li" - %& '%&" i ' ! $ %! !$ %! ! ' %"i % * i $ % +! i* % $% ," "i " , %"* " 'i % ' %"$ $ %! i"& %"* $ ++i"& ' !$, %"* % %* %" %& i"& " ! * ! ' . T &! % 6 ' ! " ! !$ $ * %! i$ + .C " % !$ %! '%i" $ * " ! '% i" ! i $ $ !i ' !$. I "$i$ $ %
i "" $ % %& $ ! . ? ! " ! Si"& + %$ M !$, 230? i $ %! $ *! ! + %$ ' !$, @15? i $ %! $ *. T " % ! %$ ! '%i" NO " % $ %"*
+ ! !% * " % $ "%' * %$ A 8i i%! C " % $ NO %"* NCB $ * ! " ! i! i" % i$ "* i"& ' % +%! $ i '+ $ ! i" !! + %" !i % i! i .
NO-" !'% + "NC-" !'% $ *
(2) Over Load Relay (Overload rotection).
O ! %* +! i " ! %" !i ' ! i$ " $$%! +! " !" %"* "$ !'%8i' '+ !% i"& i .
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"* ! %" "*i i " ! %*, % ' ! *!% $ 8 $$i !! " % % $ $ ! % i"&. Si' ! i"*i"& i"$ % i " * !i !% $ * ! % i"&, ! %! $ % i$ * i'i $ " '
+ !% i"& '+ !% ! $ +! % ' ! ! ' ! % i"&. O ! %* ! % $ %! '+ * ' ! " ! i'i %' " !! " *!% ".The overload relay does not provide short circuit protection. This is the function of over current protective equipment like fuses and circuit breakers, generally located in the disconnecting switch enclosure.
T i* % %"* %$i $ % ! ! %* +! i " ! % ' ! i$ %" ' " i !! " -$ "$+! + ! i $ ! $i'i %! % i"& ! ' ! i * % + " ' !i! i " - %* !! " i$ 8 * *. T + !% i " +! i * i $ *
% ' ! i$ % * %!! %!' $$ !- %*$ i$ i 6 ! ' * ! ' i" %" ! %* %$ + !$i$ * "&.N !'% $ $ %! " * $i&" * +! i* ! %* +! i ". $ i$ +! i"& %&%i"$ $
i! i $ ( ! !! " +! i "). M !$ *!% % i& i"! $ !! " " $ %! i"& %"*" " i "% $ $ % " % *i$ i"& i$ i"& " i$ '+ !%! %"* %!' $$ i"! $!! " %"* % *%'%&i"& ! %*. S i " $ i$ * + "* " ' ! - %* !! " ,
F ! i' ' ! i$ $ %! *. O" ! %"*, i % $ ! $ " %!& " &
+%$$ $ %! i"& ! i"! $ !! " , i * " +! ' ! %&%i"$ $'% , %!'! %*$ % 'i& ! % !.T ! %* ! % i$ %! ' ! +! i ". I %$ i" !$ - !i+- i' %!% !i$ i $,+ !'i7i"& i * i" * !i"& % !% i"& + !i * ( " i"! $ !! " i$ *!% "), +! i*i"& +! i " " $'% ! %*$ % - %* !! " " ' ! i$ ! ""i"&O ! %* ! % $ %! ! " % %"* %" i $ %"* ! + % * !i+ %"* ! $ $ i "! + % ' " . O ! %* ! % $ %"" , !, %6 + % ! !! " +! i "
i+' " .
( 7+:// !i % " $.9 $. !*+! $$. '/2012/03/2.+"&)
T ! %* ! % "$i$ $ % !! " -$ "$i"& "i "" * i" i" ' !, + $ ' %"i$', % % * $ "$i"& "i , i $ ! $, *i! ! i"*i! , ! %6 i!O ! %* ! % $ %" %$$i9 * %$ i"& !'% , '%&" i , ! ! "i .
!hermal Relay : A$ "%' i'+ i $, !'% ! %* ! % $ ! " !i$i"& '+ !% ! $% $ * ! %* !! " !i+ ! %* ' %"i$'. T !'% ! %* ! % $ %"
! ! $ *i i* * i" + $: ' i"& % %"* i' % i .
1.
"agnetic Relay : M%&" i ! %* ! % $ ! % " !! " 8 $$ $ %"* %! " %ff'+ !% ! .
2.
#lectronic Relay$ E ! "i ! $ i*-$ % ! %* ! % $, +! i* ' i"% i " i& -$!i+, %*G $ % i i , %"* %$ i"$ % % i ". T %" i* % i" '%" +! i$ %++ i % i
3.
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Wiring of DOL Starter:
(1) "ain Contact$
C " % ! i$ "" i"& %' "& S ++ ? %& , R % C i %"* T !'% O ! %* R % .L1 C " % ! C "" (NO) R P %$ ! & MCCL2 C " % ! C "" (NO) P %$ ! & MCCL3 C " % ! C "" (NO) P %$ ! & MCC .%O Contact ( '' )$(13-1@ ! 53-5@) i$ % " !'% O+ " NO " % ( $ $ " ! % " !&i> $)C " % ! P i" 53 i$ "" i"& S %! 7 " P i" ( @) %"* 5@ P i" C " % ! i$ ""
C '' " i! S %! /S + 7 ".%C Contact ( ' ' )$( 5- J) i$ % " !'% $ * NC " % ( + "$ " !'% ! %*$ !i+ i %$$ i% *
! %* 6)
(2) Relay Coil Connection$
A1 R % C i i$ "" i"& %" " S ++ P %$ %"* A2 i$ "" i"& T !'% !L %* R % K$ NC C "" i " ( 5).
( ) !hermal Overload Relay Connection$
T1,T2,T3 %! "" T !'% O ! %* R %
O ! %* R % i$ C "" i"& " M%i" C " % ! %"* M !NC C "" i " ( 5- J) T !'% O ! %* R % i$ "" i"& S + 7 " %"* C '' "C "" i " S %! /S + 7 ".
Wiring Diagram of DOL Starter:
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( 7+:// !i % " $.9 $. !*+! $$. '/2012/03/3.+"&)
Working of DOL Starter:
T '%i" %! DOL $ %! ! i$ R % C i . N !'% i & $ " + %$ "$ %" ! ' i" 'i"&$ ++ ? %& (A1). " C i & $ $ "* P %$ ! % i " !&i> $ %"* M%&" C " %+! * ! '%&" i 9 * %"* * i$ P "& ! C " % ! i ' %"* M%i" C " %
$ %! ! i $ * %"* A 8i i%! i %"& i $ + $i i " NO ' NC %"* NC '
($ " R * Li" i" Di%&!%') .*ushing +tart ,u-on$W " W P $ $ %! 7 " R % C i i & $ "* + %$ ! ' S ++ P %$ -M%i"
" % !(5)-A 8i i%! C " % (53)-S %! 7 "-S + 7 "- J- 5-T R % C i (A2).N C i" !&i> $ %"* M%&" i 9 * +! * M%&" %"* P "& ! C " % ! ' . M%i" C " %
$ $ %"* M ! & $ $ ++ % $%' i' A 8i i%! " % ' (53-5@) ! ' NO NRelease +tart ,u-on$R % i & $ $ ++ " & ! %$ S %! 7 ". W " W ! %$ S %! P $ R % C i & $ S ++ + %$ ! ' M%i" " % ! (5)-A 8i i%! " % ! (53) A 8i i%!
" % ! (5@)-S + 7 "- J- 5-R % i ($ " R * / Li" $ i" Di%&!%').
I" O ! %* C "*i i " M ! i $ ++ * i" !'i$$i " C " ! i! i % P i" J- 5*ushing +to ,u-on$W " + $ S + 7 " C " ! i! i S %! ! i ! %6 % $ + 7 " %"* S ++ R % i i$ ! 6 ", P "& ! ' $ %"* $ " % M%i" C " % ! ' $ O+ ", S ++
M ! i$ *i$ "" *.
( 7+:// !i % " $.9 $. !*+! $$. '/2012/03/ " i *.+"&)
Motor Starting Characteristics on DOL Starter:
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A %i % $ %! i"& !! " : 100
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DOL is Suitable for:
A *i! " i" $ %! ! %" $ * i i& i"! $ !! " ' ! * $ " % $8 $$i
%& *! + i" $ ++ i! i . T '%8i' ' $i> % ' ! % * " % *i! " i"$ %! ! '% i'i * $ ++ i i ! i$ ! %$ ". ! 8%'+ , % i i '% ! i!! !% $ ' !$ $ ! * *- %& $ %! !$ ! ' !$ %!& ! %" 10 6W.DOL $ %! i"& i$ $ ' i' $ $ * $ %! $'% % ! + '+$, '+! $$ !$, %"$ %"* " ! $.
DOL is not suitable for:
T + %6 $ %! i"& !! " * ! $ i" % $ !i $ %& *! + " $ ++ $ $ 'T i+' " i"& *!i " %"" !% ff $ ! i& + %6 ! %*i"&$T $% ! ' ! $ $i"& i+' " '% '+! 'i$ * $ ** " $ %! i"& %$,
! 8%'+ , i $ % % !$ %"* i $.
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50 Responses to Direct On Line Starter
La3arous says$M%! 13, 2012 % J:@5 +'
T i$ +%& %$ ! $ i" !'% i ". %! * i"& % ! ' "* $ GRe ly
don eter says$M%! 22, 2013 % :3; +'$ "* ' .*i%&!%' " ' '%i
Re lymo3es says$M%! 13, 2012 % ;:0@ +'T %"6$ ! i" , '%"..I $ $ !i %"* + i" . H * $ !i& % , MCC " % !, ! %* $i> $ ! i"* i " ' !$. A" ' *T %"6$.
Re lyhira says$M%! 2;, 2012 % @:2 +'i" '%" i"* $ ! * $ %! ! $ * ! + 15 ! 20 + ' !. ! % $ $ * + 30 +' !.
Re ly
ose h Devasia says$ " 12, 2012 % 1:32 +'A$ T ! i$ *i! +! + ! i "% C !! " , ! %*$ i& ! ! ! i! ' " $( i6
%'' !i"& ' % i"* $ !i $) " ! 50HP $ i!! %& ' !$, ! !ii"$ % % i " " !6 i$ ' $ ! "& ! $ i $ DOL $ %! i"&, ' $ i" A$i%" " !i $.
Re ly+a4al "u5her4ee says$ %" %! 1 , 2013 % 12:5; +'
" $ ! i$ $ ! "&, " i& %+% i ' !$ %" % $ $ %! * i DOL ' * %
i$ %$ *i+ i" %& i " %ff *Re ly
Dee a5 Dhiman says$ " 1;, 2012 % ;:25 %'? ! + 6" !6i"& " i %' % ! $ ! *i+ '% "&i" !.
T %"6$
Re ly0 *edersen says$ " 2 , 2012 % 11:3; %'H * %" -$ + i" !+ !% * i" i$ i! i , ! & $ + "" i " %"*
" % !
Re ly
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,adri %arayanan says$! %! 1, 2013 % 3:15 %'
-$ +, i ' %" ' !& " $ +, " $ i$ i"$ %* $ + + $ 7 " i i$& " !% % +%! " ! i!i"& % DOL S %! !. A $i'+ ' !& " $ + ( i !+ $ -+ / i$ ! %$ / 6 ! %$ ) %" $ * i %" NC " % . & " !%$+ %6i"&, E' $ + i$ " ! % ! i! * ! $ %! !$. I % $% i$$ $, " + $ &% %* i ' $ + 7 "$ i 6 ! +%* 6.
Re ly,ala ra5ash says$ " 30, 2012 % 12:01 +'C%" $ * $ %! !$ ! A8i %! S i i"& W !6i"& ' ! $+%! ' ! A '% i %
Re lyanardhan says$
12, 2012 % @:@; +'T % +i %$ ! i" ! $ i"& $ ! ' . N I "* !$ * % i$ DOL $ %! !.T %"6 ! ' .
Re lyshreedevi says$ 30, 2012 % 1:0; +'
%"6$ ! ! i" !'% i " %'%>i"& 6" *& % &i
Re lyOryech +edric5 says$A & $ 2, 2012 % :5 %'S+ "*i* * $ !i+ i " i$ $ "* !$ %"*% " i '%* i $ %$ @ ' "* !$ %"* DOL
$ %! !$
Re lynaveen oda alla says$A & $ @, 2012 % 5:5 %'
%"6$ % , i$ +%& %$ ! $
Re ly/ignesh says$A & $ 31, 2012 % 5:03 +'
S + ! .i $ ! $ 'Re ly
/ignesh says$A & $ 31, 2012 % 5:05 +'
*
Re ly*oonam +oni (6soni7 oonam819) says$S + ' ! 11, 2012 % :1 +'
i" !'% i ! $ Si! 6 + ! i"& $ % "i $ ff %"6$ % .
Re ly!revor o art says$N ' ! 13, 2012 % 3:11 %'I % % $ i " I * i6 %$6 I %' %" !i i%" I * " % %" 8+ !i " i"
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" ! i!i"& I % i"$ % * % DOL $ %! ! " % + '+ " %" % 4 % $ i %"*4 $ i " ! i! i %" + %$ *!% % i! i ! ' .
Re ly+hane :o ey says$M% 2, 2013 % ;:2J %'
* + %$ $ "* ' % $ *i%&!%' ! DOL $ %! ! i 4 % $ i % $ i" %"* ff.
Re lysadiq says$D ' ! 22, 2013 % :20 +'i ' $ i" * % 4 % $ i i" i! i .. " ! i i! % $ ++
!'% ! %* ! % +%$$ ! & 4 % $ i N.C " % ! ! % i"& " % T.O.R.$ % 4 % $ i i % i i + " " % % + !
$ %! $ ! '
Re ly
*an5a4 atil says$D ' ! 1;, 2012 % J:1@ %'I %' ! $ ! !i i%" + $ + i" * U % $ " ! %"* ! % !i"&
Re ly,adri %arayanan says$
! %! 1, 2013 % 3:0 %'I % % $i % i " ! i" ' ! i$ i"i i% $ %! * $i"& % $ %! + $ 7 ". i" %$+ ! , ' ! %$ $ %! % '% i % (i" %" i"$ %" i 'i"i' ' * % ), i. . i' % i"& $ $ %! + $ 7 " %&%i". I !i * $i"& O" * % i' !$ ! $ i$ "
! $% i$ % ! . L ' 6" ! i $.
Re lysham ho more says$
! %! 2J, 2013 % 3:0; +'I i$ ! $ i" !'% i " " +%& % * ! ! ' "* $ G
Re ly"uhammad says$M%! @, 2013 % :03 %'
E8 " $ ff . ! ! & " ! $ i" $+! %*i"& 6" *& . M%$ % %Re ly
*radee /yas says$M%! , 2013 % 12:@ +'
8 " $i! $%
Re lynilesh 5a uriya says$M%! 11, 2013 % 1:53 +'i $ % ! % ! i'+ ! %" %"* $ ! ' %"* ! "
Re ly0ura ta le says$A+!i 1 , 2013 % @:51 +'
$'%$ * i " ' ! ' ** %!! " 8 " !6 I & " !% & 8 i ' " ! '
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! %! i $VV
Re ly0l ert ;an3u says$M% 3, 2013 % 10:0@ %'
%" i "" *i! " i" $ %! ! % 4 ! $ " %'+.PL % i$ *iff ! " i"*!% i"& 3+ %$ %"* $i"& + %$ *i! " i" $ %! !
Re lyignesh.*armar says$
M% 3, 2013 % 2:5 +'DOL S %! ! ! ! $ " L%'+ VVVVVVVVVVVVVVVVVVVVVVVVVVVN & 7i"& ! + i" ..
Re ly0l ert says$M% 5, 2013 % :12 +'
% i ' %" %$ % %" i" ' " $i"& + %$ *i! " i" $ %! ! " ! i"& %4 ! $ " %'+ %$ i"6i"& DOL %$ ' %" ! " ! i"& ' !$,+ '+$, '+! $$ !$ %"* " !$ %$ %$6 * *!% " ! *i%&!%' i" " ' i" ! i $ %$ ! &%!* " ! i"& 4 ! $ " %'+
male ogo mou i says$M% 22, 2013 % 11:@2 %'%' ! % i" ! $ * " !i !i% $ * " $ i " ' ! ! %* ! %
Re ly
deodat siriram says$M% 25, 2013 % 12:11 %'IK %!" % ! ' i" !'% i " +! i* *
Re lysalim says$M% 2 , 2013 % J:35 %'
i,
O" ' "$ %" +! + $ * DOL $ %! ! ! 150 + ' !. I$ i + $$i .A %i i"& ! ! 6i"* ! + .
Re lyDaniel meresha says$M% 2 , 2013 % @:5; +'
%"6$ ! $ %!i"& ! 6" *&
Re lyi4ay says$
" 3, 2013 % 3:@ %'? ! "i !6 i %! %"6$ % ..
Re ly
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Re lyOrlando Candido says$ @, 2013 % :3@ %'I$ i + $$i $ DOL $ %! ! ! J00 XW ' !.
Re ly#ng Douglas says$ @, 2013 % 1:3 +'
%! $ "* ! . P %$ $ "* '%i % % !%"$ ' !: *i%&!%' %"* i $ + !% i ".T %"6$ %"* $$ *.
Re lyvi4ay says$A & $ 1 , 2013 % J:22 %''%$$i 8+ %"% i "$ * " % & * G . %"6$ ! i$ %! i
Re ly0lexander isoe says$
S + ' ! 1 , 2013 % J:03 %'% + ! 8+ %"% i "
Re ly"ogeni ,o says$O ! 1, 2013 % 5:2@ %'
%"6$ ! " $.
Re ly+andee 0n a3hagan says$
O ! 2, 2013 % 1:@2 %'T %"6$ ! i" !'% i ". C%" + %$ 8+ %i" % % , % DOL $ %! ! !6$
Re ly!ayo !ai=o says$O ! 1;, 2013 % J:35 %'T %"6$ @ ! +V
Re ly*arth says$N ' ! 1, 2013 % 11:0 %'D. . $ %! ! i$ i ' ! i i" $ *
Re lyignesh.*armar says$
N ' ! 1, 2013 % 2:@@ +'R %* P $ C%! ..I i$ % ! %* &i " i" P $ VVVVV
Re lyi4u says$
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