There are three watchdogs in VAMP relays.
Watchdog #1
This is an external watchdog chip which the software is feeding every 100 m/s. If the time
between two feed actions is longer than 1 s, the watchdog will reset the CPU.
Watchdog #2
This watchdog is integrated on the CPU chip. It is enabled by the software before the
operating system is started. This watchdog is fed every 5 m/s unless some software
supervising function finds any malfunction. If the time between two feed actions is longer
than 60 m/s the watchdog will reset the CPU.
Watchdog #3
This is an external watchdog circuitry which the software is feeding once a second. If the
time between two feed actions is longer than 4 s the watchdog will release the internal
fault indicating relay. (In normal situation this relay has its coil activated all the time.) Also
the red error LED on the front panel will be activated.
Watchdog #1
This is an external watchdog chip which the software is feeding every 100 m/s. If the time
between two feed actions is longer than 1 s, the watchdog will reset the CPU.
Watchdog #2
This watchdog is integrated on the CPU chip. It is enabled by the software before the
operating system is started. This watchdog is fed every 5 m/s unless some software
supervising function finds any malfunction. If the time between two feed actions is longer
than 60 m/s the watchdog will reset the CPU.
Watchdog #3
This is an external watchdog circuitry which the software is feeding once a second. If the
time between two feed actions is longer than 4 s the watchdog will release the internal
fault indicating relay. (In normal situation this relay has its coil activated all the time.) Also
the red error LED on the front panel will be activated.
Released for:Schneider Electric India
