- Joined
- Jul 9, 2023
- Messages
- 100
so, if i have battery backup for the CNC computer... what about the machine? may be a good use for my Off-Grid experiments. i could build a battery backup for the machine logic. i could set it up to maintain off of solar/wind power, and when i am using it, boost it with an AC to DC converter/charger.
so rather than the AC ATX PSU, for 5V (15A) and low current 12V (about 10A) i can use the DC ATX PSU. the question is what mode to put the PSU in. in standard PSU mode, it uses more power, but in low power mode it requires more electronics to turn on and off. i think it needs to be in standard PSU mode, with a relay on PS-ON tied to machine power, so it will activate when the machine poweres on. the problem there is in a power fail. maybe power the machine AC, then the logic in a sepperate switch. then 5v, 12v, and 24v will be powered from battery. 24v through a relay to a DC to DC boost converter.
i have a battery box i could use to keep the batteries outside, may only need a slight modification.
the idea is not to run the machine off battery, hence, no stepper power. but to allow the machine to stop and apply the Z brake, and E-stop or pause when the power fails. likely an e-stop, as the work will be wasted anyway, but i don't want the machine to eat itself while the spindle comes to a stop.
so rather than the AC ATX PSU, for 5V (15A) and low current 12V (about 10A) i can use the DC ATX PSU. the question is what mode to put the PSU in. in standard PSU mode, it uses more power, but in low power mode it requires more electronics to turn on and off. i think it needs to be in standard PSU mode, with a relay on PS-ON tied to machine power, so it will activate when the machine poweres on. the problem there is in a power fail. maybe power the machine AC, then the logic in a sepperate switch. then 5v, 12v, and 24v will be powered from battery. 24v through a relay to a DC to DC boost converter.
i have a battery box i could use to keep the batteries outside, may only need a slight modification.
the idea is not to run the machine off battery, hence, no stepper power. but to allow the machine to stop and apply the Z brake, and E-stop or pause when the power fails. likely an e-stop, as the work will be wasted anyway, but i don't want the machine to eat itself while the spindle comes to a stop.