Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

How to make generator(GENSET) ON/OFF using a contactor?

Status
Not open for further replies.

bikashh

Full Member level 5
Joined
Nov 28, 2009
Messages
264
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,298
Location
india
Activity points
3,132
Dear friends,
I am doing a project in which i need to make the GEN SET on/off using microcontroller.
for this purpose I've chosen to use the emergency button to make the same ON or OFF.Here i want to replace the emergency button with a contactor which will carry heavy current through it and also i'll be able to make it ON/OFF using microcontroller.But the contactor can be energized using a 12/24V DC which i don't have.Can anybody have any alternate solution for this.

Thanks in advance
 

bikashh

Full Member level 5
Joined
Nov 28, 2009
Messages
264
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,298
Location
india
Activity points
3,132
can you give me some details about the contactor you have mentioned

thanks for the reply
 

cameo_2007

Advanced Member level 3
Joined
Mar 15, 2007
Messages
752
Helped
70
Reputation
142
Reaction score
44
Trophy points
1,308
Location
12°58' N77°38'E
Activity points
5,046
there is nothing much detail in that.

Choose your contactor rating. I mean the heavy current rating what you want.

and look for that in the manufacturer catalogue. They will have the contactor for that current rating with both DC coil as well as AC coil.

What is your voltage and current you want to switch and is it single phase or 3phase?
 

kabiru

Banned
Joined
Nov 22, 2009
Messages
503
Helped
160
Reputation
320
Reaction score
146
Trophy points
1,323
Location
Nigeria
Activity points
0
You can follow this link for more info about the contactors,i buid something similar to it but in my own case i use a time delay circute when ever there is failure of mains supply the generator start after 30sec and if the power is restored back it of the generator.You can also follow this link for your contactors.dccontactors.com/Contactors_and_Kits.html
 
Last edited:

bikashh

Full Member level 5
Joined
Nov 28, 2009
Messages
264
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,298
Location
india
Activity points
3,132
As i said i want to use the emergency button to control the GENSET. Alternatively, can i use a DC contactor between the battery and the starter to do the same job.
thanks for the reply
 

cameo_2007

Advanced Member level 3
Joined
Mar 15, 2007
Messages
752
Helped
70
Reputation
142
Reaction score
44
Trophy points
1,308
Location
12°58' N77°38'E
Activity points
5,046
As i said i want to use the emergency button to control the GENSET. Alternatively, can i use a DC contactor between the battery and the starter to do the same job.
thanks for the reply
could you please make it clear once again..
 

bikashh

Full Member level 5
Joined
Nov 28, 2009
Messages
264
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,298
Location
india
Activity points
3,132
I've two option
first-> to replace the emergency switch and place a AC contactor
here i can turn off the GENSET anytine.
second->to cutoff the battery supply to starter(in GENSET) using a DC contactor
here i can make sure the GENSET will not run in the next ON

Both the contactors are controllable from microcontroller

According to you which one would be better and how should i implement this.

thanks for the reply
 

cameo_2007

Advanced Member level 3
Joined
Mar 15, 2007
Messages
752
Helped
70
Reputation
142
Reaction score
44
Trophy points
1,308
Location
12°58' N77°38'E
Activity points
5,046
It depends on your requirement. If you want to make the GEN off in emergency conditions then you need to cut off the line to Generator itself.
Whereas as you said, if it ok the Generator turns off only during the next cycle, probably disconnecting the starter would do.

What is the current rating you would need in case you cuts off the Generator. ?
Dont worry about the coil. The contactors are available in AC and DC coils.
 

chuckey

Advanced Member level 5
Joined
Dec 26, 2010
Messages
4,863
Helped
1,308
Reputation
2,622
Reaction score
1,281
Trophy points
1,393
Location
Southampton and holiday cottage in Wensleydale (UK
Activity points
31,695
If you bypass the emergency off switch with a contactor contact set, you are defeating its safety function. These switches are normally closed for run, so an additional contact in series that opens to stop the generator is OK, there are already some for over temp, low oil etc. However to start it you must use the proper switching sequence.
Frank
 

bikashh

Full Member level 5
Joined
Nov 28, 2009
Messages
264
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,298
Location
india
Activity points
3,132
If you want to make the GEN off in emergency conditions then you need to cut off the line to Generator itself.
Dear friend can you please explain how can i do this.

thanks for the reply

---------- Post added at 07:23 ---------- Previous post was at 06:46 ----------

Can i disconnect the supply to the ignition key.I think this will do.

thanks

---------- Post added at 07:37 ---------- Previous post was at 07:23 ----------

m sure the supply to ignition key is DC and is below 24V
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top