Re: HELP NEEDED: G540 and limit switches
There is a lot going on here. You should always wire limit switches in the normally closed position. That way in normal operation current is running through the switches (N/C) completing the circuit.
Then when the switch is hit it opens activating the limit function in Mach3. So you need to set Mach3 to active low input for the limit inputs.
The reason for using N/C switches is that if a wire breaks it will set of the limit function alerting you to the fault.
As to home switches, YES you can wire them in series or even use the same limit switches. When Mach homes, it homes 1 axis at a time so it knows which axis has hit the switch.
The exception to this is when you have a wide gantry router with each side of the gantry driven by a separate motor.
In this case all the home switches (and limits) can be connected in series to the one input except the home switch on the slaved axis. That way, when the gantry axis is homing it will run unit one of the home switches is hit stopping that motor. The motor on the other side of the gantry will continue until it's home switch is hit.
This allows you to remove any racking in the axis.
Cheers
Peter
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