% setting reference frequency (Pr. 390)
Set a reference frequency of the set frequency. The setting value of Pr. 390 "% setting reference fre-
quency" is 100% reference. The ratio of the frequency command is converted to the set frequency in
the following formula:
Set frequency = % setting reference frequency × Speed scale (Refer to page 5-512)
Pr. 390 % setting reference frequency
Set frequency written to the inverter
The % setting reference frequency cannot be set at less than the minimum frequency resolution of
The set frequency is written to RAM.
The set frequency is applied at the writing of Speed scale. (The set frequency is not applied at the
setting of Pr. 390.)
Automatic baud rate recognition (Pr. 726 "Auto Baudrate/Max Master")
Automatic changing of baud rate is available with Pr. 726 setting. When Pr. 726="128 to 255", turn the
power ON from OFF or reset the inverter to start automatic baud rate recognition.
Pr. 726 setting
Tab. 5-263: Pr. 726 settings
After the baud rate recognition, the recognized baud rate is written in EEPROM as the Pr. 332 set-
ting regardless of the Pr. 342 "Communication EEPROM write selection" setting.
The BACnet status monitor displays "1" during automatic baud rate recognition.
The communication error monitor count is not performed during automatic baud rate recogni-
During automatic baud rate recognition, the inverter does not transmit data, but only accepts
The baud rate switching operation cannot be finished if the inverter is not connected to the com-
munication bus. (BACnet protocol will not be established.)
The baud rate switching operation cannot be finished if the inverter is continuously receiving
abnormal data during automatic baud rate switching. (BACnet protocol will not be established.)
Set frequency (Speed scale)
Automatic baud rate recognition is invalid.
0 to 127
(Using Pr. 332 setting for baud rate)
Inverter monitors the data on the communication bus, and automatically switches the baud
128 to 255
The recognized baud rate is written to Pr. 332.
(N) Operation via communication and its settings
Relationship between Pr. 390 and the set frequency
5 - 509