Alarm List
Alarm Number (4000 to 4999)
Alarm List-620
340 The temperature in the Main 
board Pr (MB) exceeds the 
specified value of the welding 
source.
Arc welding power source 
error
(1)Check the ambient temperature (40 degrees centigrade or less) and 
operational ratio (60%). 
(2) Check if there are dust, dirt, and clogging on the dust protective 
filter. Clean or replace the dust protective filter if necessary.
(3)Replace the Main board Pr (MB)-030(Item No. 504).
other If the alarm occurs again, save the CMOS.BIN in maintenance mode, 
and then contact your Yaskawa representative about occurrence 
status (operating procedure).
4246 MOTOWELD INPUT 
UNDER-VOLTAGE
1 Error from welder 1. Arc welding power source 
error
Confirm the input voltage.
other If the alarm occurs again, save the CMOS.BIN in maintenance mode, 
and then contact your Yaskawa representative about occurrence 
status (operating procedure).
2 Error from welder 2. Arc welding power source 
error
Confirm the input voltage.
other If the alarm occurs again, save the CMOS.BIN in maintenance mode, 
and then contact your Yaskawa representative about occurrence 
status (operating procedure).
3 Error from welder 3. Arc welding power source 
error
Confirm the input voltage.
other If the alarm occurs again, save the CMOS.BIN in maintenance mode, 
and then contact your Yaskawa representative about occurrence 
status (operating procedure).
4 Error from welder 4. Arc welding power source 
error
Confirm the input voltage.
other If the alarm occurs again, save the CMOS.BIN in maintenance mode, 
and then contact your Yaskawa representative about occurrence 
status (operating procedure).
5 Error from welder 5. Arc welding power source 
error
Confirm the input voltage.
other If the alarm occurs again, save the CMOS.BIN in maintenance mode, 
and then contact your Yaskawa representative about occurrence 
status (operating procedure).
Alarm
Number
Alarm Name
Sub
Code
Meaning Cause Remedy