Delayed Ground Circuit

Alec_t

Joined Sep 17, 2013
14,398
I think the relay should be a double pole one if both contacts need "contact closure to ground" (according to the documentation).
 

AnalogKid

Joined Aug 1, 2013
11,193
Maybe, but I'd feel a lot better if I were permitted to see the documentation rather than rely on an "ME struggling with EE stuff". This might be an input to a PLC, or some CNC hardware. Make and model would help.

ak
 

Thread Starter

pswartz

Joined Dec 17, 2015
13
Taking the the output to ground essentially dumps memory. It isn't input to a PLC or CNC hardware. You mentioned a small logic error?
 

Thread Starter

pswartz

Joined Dec 17, 2015
13
Wired it like your diagram (my change was based on the wrong Schmitt Trigger). Still no luck. When the switch is opened, there is no delay. Outputs immediately ground. The good is that when power is removed, the outputs ground (relay works).
What is the 33uf cap from 12V to ground that is floating on the right hand side?
 

Thread Starter

pswartz

Joined Dec 17, 2015
13
Bad Schmitt Trigger... Now the initial delay seems to work, but the reset doesn't work like what I am expecting.
 
Top