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I have a CAME ZA4 controller and recently the delay between the left gate and right gate opening has disappeared i.e. both gates attempt to open at the same time - one pushes against the other triggering an automated cancellation of the open, and both gates close. 
Previously one gate used to open a couple of seconds before the other.

The technical manual talks about the 'TR2M' for "Trimmer delay on closing cycle motor n°2 adjustment".

I've played around with this adjustment and indeed it does change the delay between left and right gates on closing, but it seems to have no effect on the delay between the gates on opening.

Is there another adjustment which applies to opening?

Thanks in advance.
hi

how old is this set ?
i think is worth to swap capacitors for new one .