Applica T Ion Of Ac4 (Applicat Ion Of Cases In Cluding In Ch In G A Nd P Lu Ggin; Applica T Ion Of Ac1 (Applicat Ion T O Ac Resist A N Ce Loa; Applica T Ion T O Dc Loa; Applica T Ion For St A R -Delt A St A R T Er - Hitachi H20-T Technical Notes

2-4-2 Applica t ion of AC4 (Applica t ion of Cases In cludin g In ch in g an d P lu ggin g)
In equ ipm en t a n d m a ch iner y which in clu de inch in g a n d plu ggin g (n egat ive-ph ase bra k in g), m ak e a n d break of la r ge
st ar t in g r ush cu rr en t of t h e mot or will occur fr equ en tly. Ca t egor y AC4 is a pplied for su ch usa ge. Applica tion of AC4
is sh own in Ta bles 1 a n d 2 in pa ge 12 of t he ca t alogu e.
2-4-3 Applica t ion of AC1 (Applica t ion to AC Resist a n ce Loa d)
Ca t egor y AC1 is a pplied when usin g a r esist a nce loa d wh ich does n ot necessit at e consider at ion of ru sh cur r ent a t
st ar t in g such a s t he inca ndescent ligh t , elect r ic h ea t er , etc.
Applica t ion of AC1 is shown in Ta ble 3 in pa ge 13 of t h e cat a logu e.
2-4-4 Applica t ion of DC Load
Th e break in g ca tegor y of DC loa d becomes fa r m or e sever e in com par ison wit h AC loa d. H owever , con t act or ca n be
a pplied as sh own in Ta ble 4 in pa ge 13 of t he ca t alogu e.
2-4-5 Applica t ion for St a r-Delt a St ar t er s
Delt a m ot or is sta r -con n ected du rin g st ar t in g, a n d r edu ces st a rt in g cu r ren t a nd t or que t o on e-t h ir d of fu ll-volt a ge
st ar t in g va lu es.
(1) Loads a pplied t o st a r-delt a st ar t er s a nd elect r ica l en dur a n ce of st ar t er
Loa d
u n loa ded st a rt
squ a re t or que
(2) Kin ds of st a r-delt a st ar t er s
St a r-delt a st a rt er
(3) Com ponen t n um ber expla n at ion a n d sym bol expla n at ion
No.
2
6
22
42
49
52
Ta ble 15. Load a nd elect rica l endu r a nce
m a ch in e t ools, la t h e, gen era l in dustr ia l ma ch ines, et c.
vor t ex pum ps, tu r bine pu mps, fa ns, blowers,
deh ydr a t or s, cent r ifu ga l deh ydr at ors, et c.
P h a se-cu rr ent detectin g m et hod
Lin e-cu r r en t det ect in g m et h od
Na me
Tim er
Con t a ct or for st a r
Cir cu it br eak er (F F B)
Con t a ct or for delt a
Th er ma l over loa d r ela y
Con t a ct or for in su la t ion
E xa m ple of load
Ta ble 16.
Ma rk
IM Motor
BS P u sh bu t ton (st a rt )
BSS P u sh bu t ton (st op)
a Norm a lly open con ta ct
b Norm a lly closed cont a ct
E F F u se
21
E lect rica l endu r a nce
500,000
50,000
2 Con ta ctors m eth od
3 Cont a ct ors m et h od
2 Con ta ctors m eth od
3 Cont a ct ors m et h od
Na me