CK1614 Multi-Mode Timer

I have a CK1614 Multi-Mode Timer (see attached PDF). In Mode 7, the trigger signal starts the timing cycle. At the end of the delay time, the relay operates for 2 seconds, and the timing cycle starts again. The delay time is adjustable (with DIP switches), but the relay operating time is a firm 2 seconds.

I would like to know if there is a way to change the relay operating time. Instead of 2 seconds, I would like it to operate for 10 seconds.

Please advise. Thank you very much.

Use Mode 2 then SW2-1=ON(1), SW2-2=OFF(0), SW1=(msb)00000001 (lsb)

I want to be able to set the delay time for 5 to 10 minutes, operate the relay for 10 seconds, and cycle this pattern continuously. I'm not seeing how I can make this happen using Mode 2.

Thank you.

Hello, there. The modification shown encircled in the attached will get you approx. ten seconds. Tweaking the value of the 4k7 resistor in the modification will change the time the relay remains on. Higher value give longer time and lower value gives shorter time.

Awesome. I will try it. Thank you very much.

Scott Burns said:

I want to be able to set the delay time for 5 to 10 minutes, operate the relay for 10 seconds, and cycle this pattern continuously. I'm not seeing how I can make this happen using Mode 2.

Thank you.

Click to expand...

Sorry I did not see any requirement for the automated 5~10 minute cycle.

ccurtis's solution will delay the turn-off time a few seconds but is not particularly reliable nor predictable.
a) The relay coil is 400 Ohms and rated for 30mA at 12V .
It Must turn on before 75% of 12V and Must turn off at 5% according to the specs but may turn off at 20%... and chatter anywhere in between with any ripple on the supply exacerbated by any load regulation from relay current and amplified by the transistor. If the relay contacts are heavy current or reactive, then you can also expect the contact life cycle to be reduced by the number of chatters per cycle. Even if it doesn't chatter, it will close with 10~30 of the current much slower as it decays and the arc time is extended from 3ms normally to much longer maybe reducing the contact life by hundreds (100's) time faster. Normally they can mechanically switch 1e7 cycles but only 1e5 under full load.

So it depends on your load, which is ...?

b) a better solution would use logic gate with hysteresis which involves a bit more involved changes.

No problem. I was not specific enough. Thank you.

Scott Burns said:

Awesome. I will try it. Thank you very much.

Click to expand...

You are very welcome. Let us know how it works out.