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This is the level that the firmware uses to determine whether there is a plate
covering any of the picker sucction cups. Used in initialization and clearing to
determine if the picker is free of plates before the vacuum is turned off.
The vacuum is also checked during loading to make sure that the picker has released
the plate (ie allowed it to settle onto the registration pins) before the calms are
closed. - Generates unsolicited message only.
pvac_release_threshold is calculated during the "cal pvac" procedure as
the mid point between "vacuum with no plate on cups" and "vac_all_but_1_cup"
(free_pvac_thresh + vac_all_but_1_cup +round off factor)/2
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