8 Communications Functions
8 - 20
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
8-4 Saving a Change to Holding Register
(Enter Command)
The Write to Holding Register (06 hex) or Write to Consecutive Holding Registers (10 hex) function is
used to enable the new data. However, the new data is not stored in the EEPROM of the inverter and is
restored to the previous value when the inverter power supply is shut off.
To store a change to holding registers in the inverter’s EEPROM memory, issue the Enter command
according to the following procedure. In addition, after changing a control parameter, you need to
recalculate the motor parameters. In this case, also use the Enter command to execute recalculation.
Use the Write to Holding Register (06 hex) command to write data to the holding register for the Enter
command (0900 hex). Below are the values to be written to the holding register (0900 hex).
Note After changing any of the parameters shown below, you must recalculate the motor parameters. To
recalculate the motor parameters, write 0000 hex or 0002 hex to the holding register for the Enter command.
The list of parameters that require the motor parameter recalculation
• After receiving the Enter command, the inverter returns a response to the host and writes the
value to the EEPROM memory. You can monitor the during data write signal (Coil No.
0049 hex) to check whether the data is written.
• Since the inverter’s EEPROM memory has a limit for the number of rewrites (approximately
100,000 times), the inverter life may be shortened if the Enter command is frequently used.
How to Issue Enter Command
Set value Description
0000 Motor parameter recalculation
0001 Set value storage
0002 to FFFF Motor parameter recalculation and Set value storage
Parameter No. Item Parameter No. Item
A003/A203/A303 Base Frequency H003/H203 Motor Capacity
A004/A204/A304 Maximum Frequency H004/H204 Motor Pole Number
A044/A244/A344 Control Method H005/H205 Speed Response
A082
Motor Rated Voltage
Selection
H020/H220 to H024/H224
Various motor parameters
b112 Free V/f Frequency 7 H030/H230 to H034/H234
Various motor parameters
(Auto-tuning)
H002/H202 Motor parameter selection – –
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