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This is the level that the firmware uses to determine whether there is a plate
covering any of the unload suction cups. Used in initialization to
determine if the picker is free of plates before the vacuum is turned off.
The vacuum is also checked during 'process' to make sure that the unload cups have released
the plate (ie allowed the conveyer to draw it out) before the the conveyer is started.
Generates monitor warning only.
uvac_release_threshold is calculated during the "cal uvac" procedure as
the 2/3 point between "vacuum with no plate on cups" and "vac_all_but_1_cup"
(free_uvac_thresh + 2*vac_all_but_1_cup +round off factor)/3
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