Issues with stepper motors losing power

[dazp1976]

iWhen you say they go off, do you mean the main power to the drivers or that they disable?.
If just disable.... Do you have the enable pins wired up to the drivers?.
Worth a check. Might just be working backwards (low/high) enabled when idle/disabled when wanted. Or on wrong output.

[JAZZCNC]

iWhen you say they go off, do you mean the main power to the drivers or that they disable?.
If just disable.... Do you have the enable pins wired up to the drivers?.
Worth a check. Might just be working backwards (low/high) enabled when idle/disabled when wanted. Or on wrong output.

The enable won't drop the holding torque, it will only disable the drive outputs so they don't spin, they will still be locked and he says they drop holding torque and spin when the controller starts up so won't be the enable pins.

[dazp1976]

he says they drop holding torque and spin when the controller starts up .

Where does he say that?.
The op has no mention of getting any movement at all. Only controller fan. All he gets is power to them and motor locking, then power going off when booted.

[A_Camera]

The enable won't drop the holding torque, it will only disable the drive outputs so they don't spin, they will still be locked and he says they drop holding torque and spin when the controller starts up so won't be the enable pins.

That is not the way my CNC works. When the driver is enabled there is a holding torque. When it is disabled the holding torque is lost and I can rotate the motors with my hand. This is the way I want it to work.