Hi All,
I know I should be able to do this in my sleep but certain brain cells appear to be on holiday.... may also be age related.
I'm assembling a commercial control panel to operate two 3phase pumps with light and horn alarms. I have everything sized and designed for my needs but was unable to find a simple way to flash the LED lamp in my high/high circuit. I figure it'll need an "on" delay and an "off" delay relay but can't seem to get the logic right. The plan is to flash a light and sound a horn with a PB and latching relay to silence the horn but keep the light flashing until the level drops below the setpoint at which point it all resets. Damn timing relay logic is giving me fits. I don't have a lot of time to play as I'm also supervising the entire installation at the facility.
I found a good source for the logic but no specifics here:
http://www.allaboutcircuits.com/vol_4/chpt_5/3.html
Anyone point me to a simple schematic somewhere?
Thank,
-Larry
I know I should be able to do this in my sleep but certain brain cells appear to be on holiday.... may also be age related.
I'm assembling a commercial control panel to operate two 3phase pumps with light and horn alarms. I have everything sized and designed for my needs but was unable to find a simple way to flash the LED lamp in my high/high circuit. I figure it'll need an "on" delay and an "off" delay relay but can't seem to get the logic right. The plan is to flash a light and sound a horn with a PB and latching relay to silence the horn but keep the light flashing until the level drops below the setpoint at which point it all resets. Damn timing relay logic is giving me fits. I don't have a lot of time to play as I'm also supervising the entire installation at the facility.
I found a good source for the logic but no specifics here:
http://www.allaboutcircuits.com/vol_4/chpt_5/3.html
Anyone point me to a simple schematic somewhere?
Thank,
-Larry