I have a Dover T4 that is only faulting out in the down direction on a multi-floor run. All up runs are successful, multi floor and one floor runs are perfect. Down one floor runs are perfect BUT on a down multi-floor run it appears the current or speed monitor for the drive is not happy and the elevator faults out.

The faults are 54, 642 and 56

I have addressed WDPF, DE, AND ES MODULES. I HAVE LOOKED AT THE C1 CONTACTOR AND I AM STRUGGLING WITH CONSIDERING THE VELOCITY ENCODER BECAUSE OF THE UP FLOOR OPERATION BEING GOOD.

Thanks, for reading