pulse into block with Relays only

C

cirux

New Member

• Jan 30, 2013

• #1

hi all,

i do have a pulse which comes every 30 seconds, and now i want to change this into block:
start until 30seconds later: 'on'.
30 seconds until 1minute after start: off.
1 minute until 90 seconds: on
...off
...on
...off


is this possible with relays only? (brake and make)

i hope someone can help me with this problem.

 

MikeMl

Well-Known Member

Most Helpful Member

• Jan 30, 2013

• #2

Relay flip flop thread here.

 

C

cirux

New Member

• Jan 31, 2013

• #3

thanks,
to end this forum item, I want to share my schematic with you

 

Last edited: Jan 31, 2013

E

eTech

Well-Known Member

• Jan 31, 2013

• #4

cirux said:

thanks,
to end this forum item, I want to share my schematic with you

View attachment 70438

Click to expand...

It doesn't look like that will work.
RY1 might not be able to fully energize..

eT

 

dr pepper

Well-Known Member

Most Helpful Member

• Jan 31, 2013

• #5

That looks like a telegraph type circuit, it probably would work with the right relays, however the right relays may not be what you have.

Mikes 2 relay verion looks more reliable, esp if the i/p is a pulse.

 

C

cirux

New Member

• Feb 1, 2013

• #6

can you explain why this might not work?
the length of the pulse would be critical to energize relay 1?
or are there more difficulties?

I dont know what kind of relays i have, they fit onto a din-rail, and are quite heavy.
they where used to connect motors, and other 220V stuff.

thanks allready
cirux

 

Last edited: Feb 1, 2013

C

cirux

New Member

• Feb 1, 2013

• #7

i've found mikes two relay flipflop

i think you are right with the danger of the energizing of relay 1, but i cant find a way how i can implement the two relay flipflop in my case
I have a pulse which comes comes every 30 seconds, and i don't want to push a button.

does anyone have an idea

 

Last edited: Feb 1, 2013

dr pepper

Well-Known Member

Most Helpful Member

• Feb 1, 2013

• #8

Why cant you find a way with the relays (or are they contactors) you have, do they not have enough contacts?
Not an argument I dont quite understand your situation.

 

MikeMl

Well-Known Member

Most Helpful Member

• Feb 1, 2013

• #9

cirux said:

..., but i cant find a way how i can implement the two relay flipflop in my case
I have a pulse which comes comes every 30 seconds, and i don't want to push a button....

Click to expand...

Add a third relay whose contacts do what the pushbutton does in the two-relay circuit. That is what I suggested to the OP of the previous thread.

 

C

cirux

New Member

• Feb 4, 2013

• #10

hi MikeMI, drPepper and others,

I've tested my first configuration. I'm not 100% sure I didn't made mistakes connecting the relays, but it result in very fast switching relays.The control voltage of the relays might not be 22V AC.
At this point a friend gave me a timing relay, which solved the problem.