forum.cncdrive.com

Hi support

I am having an issue with the outputs momentarily coming on for a second at power up on the UCSB breakout board.

I have 2 other identical systems wired with the UCSB breakout boards that don't have this issue, I understand I can utilize a charge pump in the system but was wondering if there is something specific that causes this or if it is normal?

Everything is wired according to the manual for the UCSB.

Thanks in advance.

the software should be started before the main output power is applied.

I thought the controller board needed power for the software to see it otherwise it only shows demo version?

Ok so I can put a timer on a contactor to pull in the hardware after a set amount of time after the motion controller is up to speed.

So the outputs momentarily coming on at start-up is normal.

Thanks for the reply.

mark68 wrote:I thought the controller board needed power for the software to see it otherwise it only shows demo version?

He said main power. The controller can be powered up with the PC, but the motors and drives should not get power until UCCNC is running.

if your voltage in use is 24v. use the charge pump pwm signal to operate either a low power switched 24v relay or a standard 12v relay.
the pwm signal equates to around 12v... so wont solidly switch a 24v relay directly.
use this relay to then switch on high power circuits etc . ( i use 4 pole relays or standard 3 phase contactors with low voltage coil)
using this method..nothing high power is on before uccnc is on, and everything unsafe is off if uccnc crashes or is shut down.

on my machines i bring the 5v power up for the control on power up of the machine. so even with everything else off the pc can stay connected to the control pc . the 5v for the control is a tiny amount of power.

Thanks Battwell

I will look into doing that.