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Towers Suspensions (West End)
dattilo, passaquieti - 12:33 Thursday 22 February 2018 (40657) Print this report
Problem with motor SW at WE

Also in occasion of WE tuning, I was called by Paolo complaining of a blocked motor.

It was the fishing rod on F#7.  The motor GUI was displaying that the motor had reached a  limit switch (the one labeled CW) and that the 2 limit switches (CW and CCW) were swapped  (INV led).

This time, instead of trying to act at level of connector pinout, I suspected from the beginning a SW problem.

So, we contacted Giulio, that overridden the protection of the Inverted limit switches.  After that, we succeded in moving the motor  and it come out that the INV led was wrong.

So, it happened again that the motor SW errouneously recognized the status of the limit switches as swapped, and consequently set the  INV led to red on the GUI, blocking for safety the use of the motor.

  According to Giulio this is a known bug, and he is working on a new SW version.

Comments to this report:
G. Ballardin - 9:04 Wednesday 21 March 2018 (40800) Print this report

The problem related to the false INV alarms  seems to be related to the not perfect contact of the end-course and at the vibrations that accour during the movement of a motor. During the tests done during the past months, I have simulated the end-course with a normal switch. This does not unfortunately represent the real situation in the tower. I did ask for a 'real' system to test in the lab. According to Vincenzo there are no spares that could be used  as a test bench, so I did my tests with two end-courses, provided by Francesco B (see figure2). Even if this new equipment does not precisely model a real system, I provided a new version (v406) of the motor driver firmware improving the code. I tested it with success in the lab, and in accordance with the the suggestion of Vincenzo and Roberto P. I installed it in the three motor drivers of the BS tower a week ago.

This new version of the firmware should:

1) Fix the problem of false INV alarms
2) Permit the movement of a motor at the end-course when the motor driver is switched-on
3) Remember the total steps done.

Vincenzo and I did a first preliminary test on 2) and 3) with success. The tests are on-going. I hope to receive soon the OK to start to install the new version in all towers.

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