Toshiba T300MVi MEDIUM VOLTAGE, Instruction Manual

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Cautions on Changing Setting Parameters
The setting data of the T300MVi MV is saved in an EEPROM, non-volatile memory. When the
micro controller initializes at power-up, it reads the EEPROM data and copies it to the RAM (Random
Access Memory). From then on, the micro controller controls the drive using the values in the RAM.
When the setting parameters are changed, by the display-keypad or personal computer ("support
tool"), only the execution parameters in RAM are changed. If they need to be stored, they must be manually
written to the EEPROM. Without this operation, the next initialization or power up will cause them to be
replaced by the old data.
When a write to the EEPROM is performed, write processing may take 30 seconds. Turning off the
control power supply during write processing will make both the RAM and EEPROM data abnormal. When
the power is turned on again, this abnormal data will result in an error ("CHECK ERROR") preventing the
drive from running. If such an error occurs, the settings must be reloaded from a saved file. If no setting file
exists, the drive must be re-commissioned.
Do not turn off the control power supply under any circumstances while
writing data to the EEPROM.
CAUTION