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5.1.6 Password setting
When you need to set the password for the inverter, set FF.00 as a
non-zero value, exit the editing status, leave the inverter for five mins
without any operation and the password you just set becomes effective.
Press the PRG button to enter the function codes setting, it displays
0.0.0.0, it requires the passward now to enter next. If you want to cancel
the passward, just set FF.00 as 0.