cjwood555
Newbie level 4
Hey guys,
Just registered here as I'm just starting out doing a couple of little projects and could do with some advise on this one. (Also posted this in hobby/small projects)
**broken link removed**
The problem I have is that, when pressing a button (or touching wires, whatever
), the relays are rapidly switching back/forth. Obviously the 12V pulse from the switch is much longer than the relays' switching times so it's going through e.g RL4, Setting RL1, which is routing 12V to the coil of RL4, energising it and routing the 12v from the switch to the Reset winding of RL1, and so on and so on.
I had anticipated this but sadly only after having ordered the components!!
Now what I was considering was a time delay on the feed to the coils of the SPCO relays (RL4 and RL5):
**broken link removed**
The second series resistor is to slow the discharge of the capacitor so the situation above doesn't occur on a reset pulse.
The quesitons are essentially:
a) will the above work? and
b) what component values would you suggest to get a useful time delay (would estimate at least 0.25s) and not stop RL4/RL5 from working?
(I'm conscious that a high series resistance would drop the voltage too much. The coil resistance is 700ohm and 'must operate' voltage is 9V. Nominal current is 17mA).
Hope this makes sense and would be immensly grateful of any help as I need to sort this asap
Best regards,
Chris Wood
(N.B. project is not for profit but being made under my company name for insurance reasons)
Just registered here as I'm just starting out doing a couple of little projects and could do with some advise on this one. (Also posted this in hobby/small projects)
**broken link removed**
The problem I have is that, when pressing a button (or touching wires, whatever
), the relays are rapidly switching back/forth. Obviously the 12V pulse from the switch is much longer than the relays' switching times so it's going through e.g RL4, Setting RL1, which is routing 12V to the coil of RL4, energising it and routing the 12v from the switch to the Reset winding of RL1, and so on and so on.I had anticipated this but sadly only after having ordered the components!!
Now what I was considering was a time delay on the feed to the coils of the SPCO relays (RL4 and RL5):
**broken link removed**
The second series resistor is to slow the discharge of the capacitor so the situation above doesn't occur on a reset pulse.
The quesitons are essentially:
a) will the above work? and
b) what component values would you suggest to get a useful time delay (would estimate at least 0.25s) and not stop RL4/RL5 from working?
(I'm conscious that a high series resistance would drop the voltage too much. The coil resistance is 700ohm and 'must operate' voltage is 9V. Nominal current is 17mA).
Hope this makes sense and would be immensly grateful of any help as I need to sort this asap
Best regards,
Chris Wood
(N.B. project is not for profit but being made under my company name for insurance reasons)
