Vishay G4, Техническое руководство, Страница: 96 / 200

Technical Manual
5-10
Level supervision
The G4 instrument contains 32 supervision Levels that can be used to supervise
defined signals in the instrument. Digital outputs can be connected as outputs for the
Levels. For each Level, supervised scale, hystereses and operation mode for the digital
output is controlled by set-up parameters.
Functions for Level supervision are defined in menu ‘Param. Set-up’ by parameters in
the sub menus ‘Level supervision’ and ‘Outputs’.
See chapter ‘Set-up’.
‘Level X Source’
Set to ‘Not in use’ will disable level X.
Select ‘Net weight’ or ‘Gross weight’ to supervise these weight values, independent of
which weight that is actually displayed.
Select ‘Display Weight’ to supervise either gross weight or net weight,
depending on which weight that is actually displayed.
‘Flow rate’ can only be used if the parameter ‘Flow Calculation’ is activated (On) for a
scale in the Param. Set-up.
Select ‘Abs.Net Weight’, ‘Abs.Gross Weight’, ‘Abs.Disp.Weight’ or ‘Abs.Flow Rate’ to
act on the absolute value of these signals, i.e. the value independent of polarity.
‘Level X Scale’
The parameter ‘Level X scale’ is set to the scale no (1 – 8) that the supervision level
shall supervise.
‘Level X Output’:
Defines how a digital output, if connected to the Level, should operate.
The parameter can be set to make an output active when the signal is above
the Level, or when it is below the Level.
‘Level X Hyst.’:
Defines the width of a hystereses range for the Level. The definition of a negative
hystereses range starts with a minus sign( - ).
Hystereses is an intentional difference between the switch levels for increasing
and decreasing signal level. One switch level is always at the defined Level.
The other switch level is at a higher level by positive hystereses, at a lower level
by negative hystereses. See figure.
Level status
Actual status of the Levels (input signal above or below Level) can be read
Below Level 1
Above Level 1
Level 1 hyst.
positive
Increasing
signal
Level 2 hyst.
negative
Level 1 Level 2
Below Level 2
Above Level 2
Influence on the level supervision from positive hystereses,
for Level 1, and negative hystereses, for Level 2.