There are four different kinds of memories in VAMP protection relays:
FLASH ROM
The software of the relay is stored in this Read Only Memory (ROM). The chip is
programmed in the production and the data is stable; retention time is at least 20 years at
chip temperature +125°C, which gives a much longer time at ambient temperature +55°C
or less.
E2PROM
User parameters and calibration values are stored in an Electrically Erasable
Programmable Read Only Memory (E2PROM). The data retention time is 100 years or
more. The software is continuously supervising the consistency of data stored in this
memory.
Non-volatile RAM with super capacitor back-up
The first three events with time stamps of the last event burst are stored in this capacitor
back-upped Random Access Memory (RAM) memory. The data retention time in power
off situation is more than five days.
RAM
The latest 50 events with time stamps and disturbance recordings are stored in this
Random Access Memory (RAM) memory. All data is lost during a power off situation.
FLASH ROM
The software of the relay is stored in this Read Only Memory (ROM). The chip is
programmed in the production and the data is stable; retention time is at least 20 years at
chip temperature +125°C, which gives a much longer time at ambient temperature +55°C
or less.
E2PROM
User parameters and calibration values are stored in an Electrically Erasable
Programmable Read Only Memory (E2PROM). The data retention time is 100 years or
more. The software is continuously supervising the consistency of data stored in this
memory.
Non-volatile RAM with super capacitor back-up
The first three events with time stamps of the last event burst are stored in this capacitor
back-upped Random Access Memory (RAM) memory. The data retention time in power
off situation is more than five days.
RAM
The latest 50 events with time stamps and disturbance recordings are stored in this
Random Access Memory (RAM) memory. All data is lost during a power off situation.
Released for:Schneider Electric India
