Hi guy's I could use a little assistance to work out some 12 vdc wiring. I have a 12.5 kw generator totally enclosed with a damper to let air in for cooling I have instal an actuator to open or close the damper, from my genset controller I have digitals inputs and outputs what I wish to do is on start of the genset is to use a momentary pulse to fully extend an actuator (with built in limit switch) and when turning of the genset will retract the actuator using the same input to drive the relay so to inverse polarity. Many thanks in advance..

 

So you wish to use the same signal to initiate the actuator return signal as the forward stroke ?
What is the nature of the momentary signal?

 

So you wish to use the same signal to initiate the actuator return signal as the forward stroke ?
What is the nature of the momentary signal?

Yes, my genset micro controller(MEBAY DC92-DR) has digital output just a very short pulse

 

I have a relay version of a flip-flop circuit that should work.

 

I have a relay version of a flip-flop circuit that should work.

 

Hi, the only thing that I have is a picture of the relay, I taught it would have been a wiring schematic, a nice picture in fusion 360

 

I can post the one I have tomorrow.
How long is the "Short Pulse" ?

 

Hi Andy,

A DPDT 'Ratchet Relay' may be used to reverse the polarity of the voltage, applied to the linear actuator motor, to open / close the damper.

Limit switches, built into the actuator, stop it's actuation at the end of travel in either direction.



The voltage gets reversed with every consecutive pulse to the ratchet relay coil.

The voltage and pulse width are to conform to the manufacturer's specifications.

Nandu.

 

Hi Andy,

A DPDT 'Ratchet Relay' may be used to open / close the damper with every alternate pulse input to its coil.

View attachment 268463

Nandu.

Please explain how does it work

 

If you use that circuit, you should not need the diodes and limit switches as they are most likely already in the actuator.
Do you know the duration of the pulse?
The Ratchet relay actuates on-off-on on every pulse

 

Please explain how does it work

If you use that circuit, you should not need the diodes and limit switches as they are most likely already in the actuator.
Do you know the duration of the pulse?
The Ratchet relay actuates on-off-on on every pulse

Thank you, Max.

My post # 8 has been edited, Andy.

Nandu.