Re: G540 Panel Build.. To Fuse or Not to Fuse
If you are ever planning on selling the machine, it needs to be safe and not cause a fire.
It doesn't matter what burns up inside the cabinet.. its the external wiring that inspections care about. If you use #24 wire in your harness for limit switches, the BOB needs to be fused to not exceed the current of #24 wire. They assume if chips fail on the BOB, full PS current could flow. ( although highly unlikely)
Every stepper drive should be fused so if a drive fails it doesn't smoke the motor or wiring to it.
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Early IBM PC'c power supplys didn't have fuses for mouse and KB.. when people would pinch the KB cable in a office drawer, the PC powersupply could output 25 amps and cause a fire.
Larry
Manufacturer of CNC routers and Viper Servo Drives
www.LarkenCNC.com and www.Viperservo.com