Mitsubishi Electric 700 Series Installation Manualline page 36

SERIAL number check
(3)
Check the serial number printed on the rating plate of the inverter.
Refer to the inverter manual for the location of the rating plate.
Rating plate example

Symbol Year Month Control number
The SERIAL consists of one symbol, two characters indicating production
year and month, and six characters indicating control number.
The last digit of the production year is indicated as the Year, and the
Month is indicated by 1 to 9, X (October), Y (November), or Z (December.)
4 12
SERIAL (Serial No.)

3/4 BCN-C22005-679