I use 12V 1.5A power supply for controller, LPH-18-12 Mean Well.
But if the controller can work both power ways, how do I determine if the external power supply is working normally?
The power led will light up in both cases...
If the external power supply of the controller is connected (+12V), the current via the USB cable (+5V) must be zero?
Can I disconnect pin 1 in cable connector (USB Power +5V)?