Alarm List
Alarm Number (4000 to 4999)
Alarm List-691
EAXA21 board failure (1)Reset the alarm.
(2)If the alarm occurs again, replace the EAXA21 board. Save the 
CMOS.BIN before replacing the board to be safe. 
4303 CONVERTER READY 
SIGNAL ERROR
Sub Code: Signifies the 
physical No. of converter in 
which the alarm occurred
Connection failure (1)Reset the alarm.
(2)If the alarm occurs again, check the connection and inserting state 
of the following cables and connectors.
∙ YPU unit-CN604
∙ EAXA21 board CN507
∙ Converter-CN553,554,555
YPU unit failure (1)Reset the alarm.
(2)Check if the contactors (1KM and 2KM) are open, and not damaged 
by melting or sticking.
(3)If the alarm occurs again, replace the YPU unit. Save the 
CMOS.BIN before replacing the board to be safe. 
EAXA21 board failure (1)Reset the alarm.
(2)If the alarm occurs again, replace the EAXA21 board. Save the 
CMOS.BIN before replacing the board to be safe. 
Module failure (converter) (1)Reset the alarm.
(2)If the alarm occurs again, replace the converter.
other If the alarm occurs again, save the CMOS.BIN in maintenance mode, 
and then contact your Yaskawa representative about occurrence 
status (operating procedure).
4304 CONVERTER INPUT 
POWER ERROR
Sub Code: Signifies the 
physical No. of converter in 
which the alarm occurred
YPU unit failure (1)Reset the alarm.
(2)Check if the contactors (1KM and 2KM) are open, and not damaged 
by melting or sticking.
(3)If the alarm occurs again, replace the YPU unit. Save the 
CMOS.BIN before replacing the board to be safe. 
Connection failure (1)Reset the alarm.
(2)If the alarm occurs again, check the connection and inserting state 
of the following cables and connectors.
∙ EAXA21-CN507,510
∙ EAXB21-CN08
∙ Converter CN551,553
∙ YPU-CN602
Alarm
Number
Alarm Name
Sub
Code
Meaning Cause Remedy