Platootod
Member
Addition : Beware when use plc control
May I add more information :
In some project ,If you use PLC control Star-Delta circuit
please protecttion both with hardwire and program (ladder)too.
because of plc run faster than Relay or contactor ,
So ,you need to add more timer in ladder to make sure Star is stop before run Delta ..(Please interlock between Star and Delta contactor with NC contacts at Output of plc (Hardwire) .(You can use Mechanical interlock device too)
From Picture :
Input X1 = Overload
X2 = Sw.Stop
X3 = Sw.Start
Output
Y1 = Main contactor
Y2 = Star contactor
Y3 = Delta contactor
T1 = Timer for stop Star contactor
T2 = Timer for Start Run contactor
Please check an appropriate time for your's job
May I add more information :
In some project ,If you use PLC control Star-Delta circuit
please protecttion both with hardwire and program (ladder)too.
because of plc run faster than Relay or contactor ,
So ,you need to add more timer in ladder to make sure Star is stop before run Delta ..(Please interlock between Star and Delta contactor with NC contacts at Output of plc (Hardwire) .(You can use Mechanical interlock device too)
From Picture :
Input X1 = Overload
X2 = Sw.Stop
X3 = Sw.Start
Output
Y1 = Main contactor
Y2 = Star contactor
Y3 = Delta contactor
T1 = Timer for stop Star contactor
T2 = Timer for Start Run contactor
Please check an appropriate time for your's job
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