bigcanuknaz
New Member
Hi.
We have a greenhouse, and I am rebuilding our alarm annunciation panel. This is the panel that allows us to bypass alarms that feed into our alarm panel, and indicates (currently with a flashing led light) that an alarm has been bypassed, so we don't go home with bypassed alarms. Currently, if an alarm is bypassed, we must either:
1. Fix the alarm condition, and re-enable the alarm (flasher stops), or
2. If we can live with the alarm condition (say because we are not growing in that zone), then we can bypass the flasher for that zone.
Currently, we have a single flasher (for "bypassed alarm warning"), and mechanical indication on each bypass pushbutton (that the alarm is bypassed). These pushbuttons are cheap and fragile, and their deterioration over time is the main reason I am rebuilding the panel.
I want to use a lighted 2 position lever switch from automation direct. This is cheap, robust, and easy to wire.
https://www.automationdirect.com/ad...luminated_-a-_Non-Illuminated/LED/GCX1253-24L
https://www.automationdirect.com/ad...luminated_-a-_Non-Illuminated/LED/GCX1253-24L
When the switch is on (alarm bypassed) the light will go on, indicating it is bypassed. Great!!
Now it struck me, that since I already have a light, I do not need a separate flasher. I can make each of the individual lights flash when they are bypassed. (even better because now I know which zone needs attention) But I still want a steady light, when bypassed, but when we can live with the alarm condition.
Without using a relay for each zone, and to be able to reuse the cheap terminal strip knife switches as "no flash for this zone" switches, I want to:
Wire the main 24vdc power for *all* the switches through a 24vdc flasher (existing). That way when a switch is bypassed, the light will flash. So far so good.
When we want to "live with an alarm condition" we will close the knife switch *for an individual zone* and feed constant 24vdc to the same terminal on the lighted switch to keep the light on steady (meaning, bypassed but living with it) The problem is, then the continuous 24vdc would back-feed to all the other switches as well, so I need a diode to stop this.
What diode do I need to use?
24vdc, and just milliamps for the LED light on the switch.
Sorry for such a simple question. (took horticulture at uni, not electronics...)
Thanks
naz
We have a greenhouse, and I am rebuilding our alarm annunciation panel. This is the panel that allows us to bypass alarms that feed into our alarm panel, and indicates (currently with a flashing led light) that an alarm has been bypassed, so we don't go home with bypassed alarms. Currently, if an alarm is bypassed, we must either:
1. Fix the alarm condition, and re-enable the alarm (flasher stops), or
2. If we can live with the alarm condition (say because we are not growing in that zone), then we can bypass the flasher for that zone.
Currently, we have a single flasher (for "bypassed alarm warning"), and mechanical indication on each bypass pushbutton (that the alarm is bypassed). These pushbuttons are cheap and fragile, and their deterioration over time is the main reason I am rebuilding the panel.
I want to use a lighted 2 position lever switch from automation direct. This is cheap, robust, and easy to wire.
https://www.automationdirect.com/ad...luminated_-a-_Non-Illuminated/LED/GCX1253-24L
https://www.automationdirect.com/ad...luminated_-a-_Non-Illuminated/LED/GCX1253-24L
When the switch is on (alarm bypassed) the light will go on, indicating it is bypassed. Great!!
Now it struck me, that since I already have a light, I do not need a separate flasher. I can make each of the individual lights flash when they are bypassed. (even better because now I know which zone needs attention) But I still want a steady light, when bypassed, but when we can live with the alarm condition.
Without using a relay for each zone, and to be able to reuse the cheap terminal strip knife switches as "no flash for this zone" switches, I want to:
Wire the main 24vdc power for *all* the switches through a 24vdc flasher (existing). That way when a switch is bypassed, the light will flash. So far so good.
When we want to "live with an alarm condition" we will close the knife switch *for an individual zone* and feed constant 24vdc to the same terminal on the lighted switch to keep the light on steady (meaning, bypassed but living with it) The problem is, then the continuous 24vdc would back-feed to all the other switches as well, so I need a diode to stop this.
What diode do I need to use?
24vdc, and just milliamps for the LED light on the switch.
Sorry for such a simple question. (took horticulture at uni, not electronics...)
Thanks
naz