CHAPTER 4. OPERATION 37
stopped.
Note 5 : When one or more errors occur, the corresponding bits “H” are set to 1.
Example: Overload and Under speed: 0xFF06
Note 6 : The over temperature failure refers to when the inverter turns o due to
the temperature overcoming 105°C, not to the temperature protection actuating.
Error Code
Code Error
F0h Error in 4th Byte
F2h Checksum error
F4h Command error
F8h Error in the 3rd Byte
If compressor is stopped due to a failure (see Data Status table), it is possible to
reset that failure sending a speed command to turn inverter o (0 rpm set speed).
However, if nothing is done, the failure reset will occur aſter 8 minutes and then the
compressor will try to restart. The following example shows a situation where the
compressor speed is set at 2000 RPM.
Example: Set compressor at 2000 RPM
Step 1: select proper command
Command for selecting a speed is Set speed
ID →A5h
CMD →C3h
Step 2: transform speed from decimal into hexadecimal base
2000d →07D0h
Step 3: split lower and higher Bytes
LSB →D0h
MSB →07h
Step 4: calculate sum of rst 4 Bytes
S14h=A5h+C3h+D0h+07h
S14h→23Fh
Step 5: boolean logic to maintain sum as 8-bit
L14h=0FFh AND S14h
L14h →3Fh
Step 6: calculate checksum
CK=100h-(0FFh AND S14h)=100h-3Fh
CK= →C1h
Command: A5h C3h D0h 07h C1h
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