Coolant pump circuit issue

[Ashraf_Farrag]

I misread that point on you swapping the outlets and the M codes to finish your job. I read it as you switched to MQL to finish the job (and not switching outlets for the flood).

Stupid question but did you change the fuse to the appropriate size for the plate on your upgraded 1/4 HP pump? There are fast (cheap) and slow blow (expensive) fuses for these industrial holders and the open the circuit at this amperage is different for each type of fuse.

Coolant upgrade

I have been using the fog buster since I got my mill and decided to use flood to see how it works out. I am amazed at the difference in finish I am getting! I got a coolant ring from LMD-NC.com and a 1/4 HP pump. I’m thrilled with the volume, and the pressure washes the chips right down the drain! Here are a couple of videos of it in action. [Now this is coolant!] [Another angle] [image]

You already did this but yeah, sadly, it seems like if it happens again you:

1. Disconnect power input to the circuit and ohm each point from source to target and wiggle/test connectors/wires
2. May have to do the same with voltage applied

The relay in theory should either work or it won’t. Going bad could be partial circuit and high resistance where the pump motor is straining to start. Same for any sort of high resistance from source to motor.