Originally Posted by
maver1ck
I would interpret your observation differently. If only channel 2 lights up, I would start by assuming the string for Channel 1 is broken preventing the e-stop relay from allowing it to power up (essentially doing what it is designed to do). I believe the bulk of this circuit for you to check is on Page 5 of your prints which should give you a good idea of where the signal could be getting lost.
As I indicated previously, these e-stop relays are very reliable so I don't look at them often, but if I'm remembering correctly, the "normal" status for the indicator lights is:
Machine in e-stop or waiting for power on button to be pressed: Power - On, Start - On, Channel 1 - Off, Channel 2 - Off
After machine is powered up: Power - On, Start - Off, Channel 1 - On, Channel 2 - On