LTDVE8CH– INSTRUCTIONS MANUAL
24
The diagram in
Figure 8
: protection prevents too long turn-on time
shows what happens when the
turn-on time is too long. As visible in the diagram, the light is switched off at
TonMAX
, earlier than
the original requirement.
Figure 8: protection prevents too long turn-on time
The diagram in
Figure 9
: protection prevents too short turn-off time
shows what happens when turn-
off time is too short. As visible in the diagram, the light is switched on at
ToffMIN
, later than the
original requirement.
Figure 9: protection prevents too short turn-off time
The eight protection blocks are completely independent regarding to
TonMAX
(maximum turn-on
time) and
ToffMIN
(minimum turn-off time). All of these time intervals can be programmed and may
range from 1 ms to 1023 ms in steps of 1 ms.
The turn-on protection can be inhibited on selected outputs if a continuous operation is required by
the application. Similarly, the turn-off protection can be inhibited on selected outputs if required by
the application.
Setting of the output protection logic can be done using the serial RS485 or Ethernet interfaces.
12.7. Free running oscillator
The free running oscillator is an autonomous asynchronous trigger source with a programmable
period from 1000 ms down to 10 ms in steps of 1 ms (corresponding to a frequency of 1 Hz up to 100
Hz). It can be selected as an input to the input multiplexers.
Common usage of the oscillator is to test the lights during machine assembly and deployment.
input
TonMAX
output
TonMAX
ToffMIN
input
TonMAX
ToffMIN
TonMAX
TonMAX
TonMAX
output
