Vishay G4-DT, Техническое руководство, Страница: 88 / 174

Technical Manual
6-6
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. The properties for each Level are configured by set-up parameters.
Functions for Level supervision are defined in menu ‘Parameter Set-up’ by parameters
in the sub menus ‘Level Supervision’ and ‘Outputs’. See chapter 4 Set-up.
‘Level X Source’
Set to ‘Not in use’ will disable level X.
Select the signal that should be supervised by level X.
‘Level X Mode’
This parameter selects if the level should supervise the absolute value of the signal.
Note that if ‘Absolute’ is selected and the set level is negative, the level will always be
active regardless off the actual value off the signal.
‘Level X Function Block
The parameter ‘Level X Function Block’ is set to the Function Block 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 Hystereses’
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.
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.