OK.
Googling around, seems there are available delay relay circuits that will reset on power off
but they require an additional "delay initiation" trigger. And prices rise rapidly.
Off the top of my head, if you were to use a DPST relay in the timer power circuit, as below:
- at "Timer power" OFF (current screen shot), relay contacts will remove power from the Delay Timer and then immediately short the Delay Timer 12VDC input contacts, instantly removing the charge on the input cap AND stopping the timer circuit. This will allow, essentially, on re-application of power ( irrespective of the duration), a
timed delayed output from the timer.
Of course, any power ON condition duration that is
less than the selected output delay duration will truncate that delay.
Admittedly, adds expense and complexity but, as a workaround with your existing equipment, I don't at the moment see another option.