© 2017 Adolf Nissen Elektrobau GmbH + Co. KG
Construction and function
Variable Message Sign
18
3.4.14 System guard (optional)
Status-LED
Error-LED
The system guard is used for following protection functions:
·
protection against deep discharge of the battery
·
protection against overvoltage of the system
·
switch-on delay
LED status indicator:
When the battery voltage is applied both LED flash once.
LED error (red) off :
No error.
LED error (red) flashes
every second:
Overvoltage, system has been switched off due to overvoltage
LED error (red) flashes
every 10 seconds:
Undervoltage, system has been switched off due to undervoltage.
LED status (yellow) off:
System is switched off.
LED status (yellow) on:
System is switched on.
LED status (yellow) flashes:
Power on delay.
Description of the different functions:
The system guard is used to protect the battery against deep discharge and the control electronics
against overvoltage. In the case of overvoltage the system is switched off immediately.
The system guard applies the adjusted switching limits of compatible downstream systems (e.g.
NiBus Master circuit from version 6.10) in the case of over-/ undervoltage automatically.At under-
voltage the system continuous running for 90 minutes. If the undervoltage limit is exceeded more
than 0,5V the system guard switches off after a short delay.
Non compatible downstream systems run without automatic detection. At undervoltage the sys-
tem guard switches off after a short delay.
If a modem is connected the system guard can reset the system via radio connection.
Furthermore the system guard features a switch-on delay. When the system has been switched off
it cannot be switched on again before 30 seconds are over. In this manner the control always starts
without problems.
Содержание VarioSign Series
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