Nhm trnh by: Nhm 5Ni dung trnh by: Kh c in iu khin R le thi gian.

Trnh by c khi nim, cu to, nguyn l hot ng ca r le thi gian.S dng thnh tho r le thi gian m bo an ton cho ngi v thit b.

4.4.R LE THI GIAN4.4.1.Khi qut chunga Khi nim:R le thi gian l mt kh c in to thi gian m chm hot ng chm ca h thng tip im so vi thi im a tn hiu tc ng vo r le.b Cu trc chung ca r le thi gian:Tn hiu voTn hiu ra

Khi nhn tn hiu

Khi to thi gian tr

Khi chp hnh

C Phn loi

Cn c vo b to thi gian tr

R le thi gian in t

R le thi gian in t

R le thi gian kiu thy lc

R le thi gian kiu ng h

d Mt s hnh nh v r le thi gian

d Mt s hnh nh v r le thi gian

2.CU TO V NGUYN L LM VIC CA RLE THI GIAN

A.Cu toC cu in t

Mch tCun dyH thng tip imI< hoc bng 6mA

UAC[+-+12vCLR+-C1D2AR1R2C2R3QRL-DCB UAC

1- 3: Tip im thng m 1- 4: Tip im thng ng5- 8: Tip im thng ng m chm6- 8: Tip im thng m ng chm2- 7: Cun dy S ni dy

K hiu rle thi gian trong s mch inON-DELAY- Cun ht ca r le thi gianOFF-DELAY

+ Tip im thng ng m chm:Hoc- Tip im ca r le thi gian+ Tip im thng m ng chmHoc

Khi cp in vo chn 2-7

Khi cp in vo chn 2-7Sau 1 thi gian ty theo ngi iu chnh

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