Technical data

Chapter 4 Digital output modules Manual VIPA System 200V
4-32 HB97E - SM - Rev. 09/19
For each channel the module has a configurable preheat function to avoid
overcurrent errors by fast dimming of a cold filament. For configuration
there are the parameters preheat time and preheat value. With the preheat
time the duration of preheating may be preset. With the preheat value a
threshold in % may be preset starting from the preheat function is active.
The following figure shows the usage of the preheat function at an
example.
The preheat value is e.g. 40%. Values below this threshold are output
without preheating. Here it is dimmed to maximally 70%.
100
70
50
40
30
20
10
0
1 2 3 4 5
in %
t
(1) Dim up to 30% (no preheating - below the threshold)
(2) Dim down to 10%
(3) Dim up to 70%, at 40% constant during the preheat time
(4) At preheat time it is dimmed up to the preset 70%.
(5) It is directly dimmed down to 0%.
Preheat time
Preheat value