YASKAWA DX100 Maintenance Manual page 564

Alarm Alarm Name Sub
Number Code
3
4
Meaning Cause
CPU1 detected feedback value Connection failure
(KMMB) did not turn ON/OFF
within a certain time period from
contactor 3 SERVO ON/OFF, or
CPU1 detected poor connection
between YSU unit and contactor.
Contactor failure
YSU unit failure
CPU1 detected feedback value Connection failure
(KMMB) did not turn ON/OFF
within a certain time period from
contactor 4 SERVO ON/OFF, or
CPU1 detected poor connection
between YSU unit and contactor.
Contactor failure
YSU unit failure
Remedy
(1)Reset the alarm.
(2)If the alarm occurs again, check the followings.
·Connected confirmation of YSU unit (CN215 connector) and contactor
(1)Reset the alarm.
(2)If the alarm occurs again after confirming the connection, execute the
following contents.
·Replacement the connected contactor or relay that drives contactor
(1)Reset the alarm.
(2)If the alarm occurs again after replacement the contactor or relay that
drives contactor, replace the YSU unit. Save the CMOS.BIN before replacing
the YSU unit to be safe.
(1)Reset the alarm.
(2)If the alarm occurs again, check the followings.
·Connected confirmation of YSU unit (CN215 connector) and contactor
(1)Reset the alarm.
(2)If the alarm occurs again after confirming the connection, execute the
following contents.
·Replacement the connected contactor or relay that drives contactor
(1)Reset the alarm.
(2)If the alarm occurs again after replacement the contactor or relay that
drives contactor, replace the YSU unit. Save the CMOS.BIN before replacing
the YSU unit to be safe.