Gate function of relay

[chris kennedy]

I have an Omron H3CA-A timer relay I'll be wiring up this week. I'm confident I know what I need to do for my application but was wondering what the "Gate" function is for.

Thanks

 

[Mgraw]

Everything you want to know about gates.

https://www.allaboutcircuits.com/textbook/digital/chpt-3/digital-signals-gates/

 

[chris kennedy]

Very interesting thanks!

 

[kwired]

I have an Omron H3CA-A timer relay I'll be wiring up this week. I'm confident I know what I need to do for my application but was wondering what the "Gate" function is for.

Thanks

Top of page 6 in your link, which you probably have looked at.

Pay close attention to note 2. "The set time is the sum of t1 and t2."

Gate input basically pauses timing but doesn't reset the timer. Remove gate input and timing resumes from where it paused.

 

[Ingenieur]

pg 6
gate diagram
not clear to me

looks like
start signal is sent, a pulse
after a period of time the gate signal is sent, a pulse
the sum of time delta between the start and gate plus duration of the gate closes the control contacts that duration after the gate is sent

 

[kwired]

pg 6
gate diagram
not clear to me

looks like
start signal is sent, a pulse
after a period of time the gate signal is sent, a pulse
the sum of time delta between the start and gate plus duration of the gate closes the control contacts that duration after the gate is sent

start signal is sent, timing starts immediately, start signal is later lost but timing continues.

At the end of t1 gate signal is received, timing is paused as long as gate signal is present.

gate signal is removed and t2 represents additional timing period.

This is a model of "on delay operation" what they didn't show is actual set time and maybe could have done a little better job representing that somehow, it is in this example at the end of t2 time period.

They could have possibly shown several instances of gate signal in there and set time may have occurred at t10 or something or even between t5 and t6.

If gate signal is received after set time is up, it doesn't really do anything as output relay is already on. need a reset signal or loss of power to reset things.

If you have gate signal when start is applied - start is initiated but timing won't happen until gate signal is removed.

 

[Ingenieur]

start signal is sent, timing starts immediately, start signal is later lost but timing continues.

At the end of t1 gate signal is received, timing is paused as long as gate signal is present.

gate signal is removed and t2 represents additional timing period.

This is a model of "on delay operation" what they didn't show is actual set time and maybe could have done a little better job representing that somehow, it is in this example at the end of t2 time period.

They could have possibly shown several instances of gate signal in there and set time may have occurred at t10 or something or even between t5 and t6.

If gate signal is received after set time is up, it doesn't really do anything as output relay is already on. need a reset signal or loss of power to reset things.

If you have gate signal when start is applied - start is initiated but timing won't happen until gate signal is removed.

makes sense

 

[chris kennedy]

makes sense

Ditto

Thanks

 

[Barbqranch]

I have used those timers many times. Mostly I just hardwire start, and leave the other functions open.

 

[kwired]

I have used those timers many times. Mostly I just hardwire start, and leave the other functions open.

Guess it depends on what function you are using, but if just using basic "on delay" and no need for the gate function, a basic on delay timer that don't have the extra functions and terminals cost less, Omron has those as well.

 

[LarryFine]

Guess it depends on what function you are using, but if just using basic "on delay" and no need for the gate function, a basic on delay timer that don't have the extra functions and terminals cost less, Omron has those as well.

I have used the simple SPDT-output timers to maintain exhaust function for 10 minutes after temperature-sensor triggering on kitchen hood systems with mechanical gas valves.