hwmonkey
Newbie level 1
I am a hobbyist. I have used automation systems and repaired damaged PCBs and stuff, but my training is limited to a course when I was about 10 years old which was a long time ago. Usually, I am a hobbiest out of necessity. I used to have some nearby friends to consult about issues, but we moved. I am hoping to find some assistance here.
Context: I have a commercial garage door opener. It operates perfectly when opening. Closing is now an issue. When I push close, it will not stop trying to close. It has two normally closed switches in the circuit. Both switches are operating perfectly. Without a switch in the circuit, nothing operates. I have concluded that the logic chip on the circuit board is damaged. I cannot find the logic chip to purchase anywhere. The circuit board was discontinued and the replacements costs $150. https://www.powermastergateopeners.com/Powermaster-Circuit-Board-PBR2-PRB3-PBRSS_p_515.html which is more money than I can afford right now.
Solution: Break the circuit at the point of the switches and create my own sub-circuit. The sub-circuit would simply break the 110V supply (relay) when either switch A or switch B is tripped. The circuit would break for 4-10 seconds then return to normal state.
HELP: The concept seems simple in my mind. I have the two NC switches. I just do not know what to insert for the OR logic or timing. In my mind, the following is the logical circuit:
Thank you for the help!!
Context: I have a commercial garage door opener. It operates perfectly when opening. Closing is now an issue. When I push close, it will not stop trying to close. It has two normally closed switches in the circuit. Both switches are operating perfectly. Without a switch in the circuit, nothing operates. I have concluded that the logic chip on the circuit board is damaged. I cannot find the logic chip to purchase anywhere. The circuit board was discontinued and the replacements costs $150. https://www.powermastergateopeners.com/Powermaster-Circuit-Board-PBR2-PRB3-PBRSS_p_515.html which is more money than I can afford right now.
Solution: Break the circuit at the point of the switches and create my own sub-circuit. The sub-circuit would simply break the 110V supply (relay) when either switch A or switch B is tripped. The circuit would break for 4-10 seconds then return to normal state.
HELP: The concept seems simple in my mind. I have the two NC switches. I just do not know what to insert for the OR logic or timing. In my mind, the following is the logical circuit:
Thank you for the help!!