7i76e spindle problem: It runs, but only after reconnecting ENA

I have a really strange spindle problem: The spindle works, but only if I disconnect/reconnect ENA while LinuxCNC and the VFD are enabled.

I am using a MESA 7i76e.
The VFD is a YL-620. I use the same wiring as I found on the forum here :

 

Steps to reproduce:
1. Connect everything as pictured.
2. Open LinuxCNC, turn on the machine/VFD, turn on the spindle in LinuxCNC.
3. Nothing happens.
4. Physically disconnect REV and ENA pins from the VFD.
5. Reconnect ENA pin. The spindle spins up immediately.

.hal and .ini files attached.

I did configure the VFD, including setting P00.16 to 1 to enable ENA/DIR mode.

Any idea what may be going on?
 

Sounds like ENA/DIR mode is not really set

Can you verify VFD operation with hardwiring or mechanical switches?

Yes, it works with physical switches (By bridging between XGND and FWD, the motor runs forward. A bridge between XGND and REV does nothing. A bridge between XGND and both makes it run backwards.)

Is that with ENA asserted?

I would expect this behaviour with ENA/DIR:

No motion unless ENA asserted
ENA+ DIR NOT asserted --> FWD
ENA+ DIR asserted --> REV

(dir may be inverted)

Yes, that is exactly the behavior I see when using physical bridges.

It was a wiring problem, it is fixed now. Thanks for your help, that made it easier to narrow down.

That was the final problem, everything in my machine is completely working, yay!