EBA 551LT error code Ert 01

hello
guillotine EBA 551LT
after the start button is pressed, it reaches the rear limiter, moves forward and stops. alternately displays measure ,,57,20, and ,,Ert 01,, .

the rear limiter has been checked!
the encoder was checked with the oscilloscope and the two square wave signals are OK.

suggestions?

Thank you

 

Check the calibration switch. The rear limit switch is being activated before the calibration reference switch is found.

 

Hello ESPofKC

calibration switch ?
Rear limit switch ?
calibration reference switch ?

What are they in the picture below?

Thank you

 

I do not see them in that picture. that is the mechanical parts breakdown. Not electrical