I am working on retrofitting a vertical mill and I want to be able to turn on the power switch on my console and have it start up the computer which in inside the electronics cabinet. The power switch will control a contactor which will supply 110 V to the cabinet’s power strip where the computer will be plugged in. As soon as the computer gets power, there is a 5 VDC standby voltage that comes out of the computer’s power supply on the ATX header. I want to use this 5VDC as the start signal to short the two pins on the motherboard’s front panel header which coincides with the connections from the computer’s “power on” switch. I need to short these two pins for about 3 seconds to simulate pressing the computer’s power switch.
I have a tq2-l-5v which is a 5v solid state relay which if you apply voltage to pins 1 and 10, the relay closes pins 2 and 9, and leaves them in this closed state until you apply voltage in the opposite direction on pins 1 and 10 which then opens pins 2 and 9. So for this component, as soon as I get 5VDC standby voltage on the computer’s power supply I want apply voltage to pins 1 and 10. The voltage only has to be on for a moment to switch the relay because the relay will stay in its "on" state forever or until an opposite voltage is applied.
3 seconds after turning the relay on, I want to apply a voltage in the opposite direction to turn the relay off. I have a 555 timer (and 556 timers) which I think I can use to control the TQ2-L-5V relay and set the timing using an RC circuit. The issue I have is I am not sure if I can go positive to negative on pins 1-10 to start, and then negative to positive on pins 1-10 to stop; without shorting the power since I will have both positive and negative connected to both pins 1 and 10.
I found this 555 timing circuit that turns a green light on for a set time and then shuts it off and turns the red light on, (which is kind of what I what to do), but I am not sure how to convert it to get the positive to negative and negative to positive function I need on pins 1-10 on the relay.
I have both 555 and 556 timers, and loads of resistors and capacitors to vary the circuit timing, so I could possibly create two circuits, one to turn the relay on which only needs to apply voltage for 1 second, and a second circuit that 3 seconds after starting, will apply power in the opposite direction to turn the relay "off", but I am still worried about the shorting issue. Is it possible to prevent shorting through a creative use of diodes or possibly use a 556 timer if it can separate out the two signals going to the relay? Is it possible to do what I want with these components?
I had an earlier concept of simply applying power to a SPDT relay via a NPN transistor as soon as the 5Vdc standby power turned on, and then use an RC circuit as a time delay to eventually energize the NPN transistor after about 3 seconds to turn the relay off. I pretty sure this would work, but I am not sure that constantly applying power to the NPN transistor is a good design.
I do want this to be a onetime only switch that occurs when the power is turned on and never occurs again as long as the power is on. When I shutdown, I will do a normal shutdown of the computer and then I will turn off the main 110v power switch. The standby power actually will stay on for about 5 seconds after the 110 v power is turned off.
Thanks for any guidance you can provide.
I have a tq2-l-5v which is a 5v solid state relay which if you apply voltage to pins 1 and 10, the relay closes pins 2 and 9, and leaves them in this closed state until you apply voltage in the opposite direction on pins 1 and 10 which then opens pins 2 and 9. So for this component, as soon as I get 5VDC standby voltage on the computer’s power supply I want apply voltage to pins 1 and 10. The voltage only has to be on for a moment to switch the relay because the relay will stay in its "on" state forever or until an opposite voltage is applied.
3 seconds after turning the relay on, I want to apply a voltage in the opposite direction to turn the relay off. I have a 555 timer (and 556 timers) which I think I can use to control the TQ2-L-5V relay and set the timing using an RC circuit. The issue I have is I am not sure if I can go positive to negative on pins 1-10 to start, and then negative to positive on pins 1-10 to stop; without shorting the power since I will have both positive and negative connected to both pins 1 and 10.
I found this 555 timing circuit that turns a green light on for a set time and then shuts it off and turns the red light on, (which is kind of what I what to do), but I am not sure how to convert it to get the positive to negative and negative to positive function I need on pins 1-10 on the relay.
I have both 555 and 556 timers, and loads of resistors and capacitors to vary the circuit timing, so I could possibly create two circuits, one to turn the relay on which only needs to apply voltage for 1 second, and a second circuit that 3 seconds after starting, will apply power in the opposite direction to turn the relay "off", but I am still worried about the shorting issue. Is it possible to prevent shorting through a creative use of diodes or possibly use a 556 timer if it can separate out the two signals going to the relay? Is it possible to do what I want with these components?
I had an earlier concept of simply applying power to a SPDT relay via a NPN transistor as soon as the 5Vdc standby power turned on, and then use an RC circuit as a time delay to eventually energize the NPN transistor after about 3 seconds to turn the relay off. I pretty sure this would work, but I am not sure that constantly applying power to the NPN transistor is a good design.
I do want this to be a onetime only switch that occurs when the power is turned on and never occurs again as long as the power is on. When I shutdown, I will do a normal shutdown of the computer and then I will turn off the main 110v power switch. The standby power actually will stay on for about 5 seconds after the 110 v power is turned off.
Thanks for any guidance you can provide.