YASKAWA DX100 Maintenance Manual page 569

Alarm Alarm Name Sub
Number Code
18
19
20
21
Meaning Cause
CPU2 detected an inconsistency YSU unit failure
of servo ON 2 signal (SFRDY2).
CPU2 detected an inconsistency Connection failure
of contactor 2 signal (KMMB2).
Contactor failure
YSU Unit or
connection cable
failure
CPU2 detected an inconsistency YSU unit failure
of servo ON 3 signal (SFRDY3).
CPU2 detected an inconsistency Connection failure
of contactor 3 signal (KMMB3).
Contactor failure
Remedy
(1)Reset the alarm.
(2)If the alarm occurs again, 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.
·Wiring confirmation of pin numbers A5, A6, B5, and B6 of YSU unit (CN213
connector)
(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, execute the following contents. Save the CMOS.BIN before
replacing the YSU unit to be safe.
·Replacement of YSU unit
·Replacement of connection cable
(1)Reset the alarm.
(2)If the alarm occurs again, 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.
·Wiring confirmation of pin numbers 5, 6, 7, and 8 of YSU unit (CN215
connector)
(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