Mitsubishi Electric 9900CX SERIES Owner Technical Manual page 55

Table 6.1 Bypass Module Fault Code List
Code
Status
indication
Message
(Note 2)
UF376 CTRL.CIRCUIT ERR.
UF377 CTRL.CIRCUIT ERR.
UF378 CTRL.CIRCUIT ERR.
UF381 CTRL.CIRCUIT ERR.
UF382 CTRL.CIRCUIT ERR.
UF383 CTRL.CIRCUIT ERR.
UF384 CTRL.CIRCUIT ERR.
UF385 CTRL.CIRCUIT ERR.
UF401 52S ABNORMAL
UF402 52S ABNORMAL
52L OPERATION
UF420
ERR.
UF451 52S ABNORMAL
UF452 CB3 ABNORMAL
9900CX SERIES UPS
OWNERS / TECHNICAL MANUAL
Meaning
No control response from another
UPS although its detection is
possible.
Logic signal abnormal (Supply
OFF).
No answer for sending
synchronizing signal.
No module supply answer during
UPS operation.
Module supply answer during
UPS halt.
Module overcurrent answer
continued for 10 seconds or
more.
Minor communication error by
fall-out of only A-side of dual
connector.
Minor communication error by
fall-out of only B-side of dual
connector.
Error to close the contactor 52S.
Error to open the contactor 52S.
Load circuit breaker 52L opened
during inverter operation.
Contactor 52S failed during load
transfer from inverter to bypass.
Contactor CB3 is not working
properly.
MITSUBISHI ELECTRIC 9900CX SERIES UPS
Page Number:
Audible
Guidance
Alarm
CALL
Intermittent
SERVICE
sound
ENGINEER
CALL
Intermittent
SERVICE
sound
ENGINEER
CALL
Intermittent
SERVICE
sound
ENGINEER
CALL
Intermittent
SERVICE
sound
ENGINEER
CALL
Intermittent
SERVICE
sound
ENGINEER
CALL
Intermittent
SERVICE
sound
ENGINEER
CALL
Intermittent
SERVICE
sound
ENGINEER
CALL
Intermittent
SERVICE
sound
ENGINEER
CALL
Continuous
SERVICE
sound
ENGINEER
CALL
Continuous
SERVICE
sound
ENGINEER
CALL
Continuous
SERVICE
sound
ENGINEER
CALL
Intermittent
SERVICE
sound
ENGINEER
CALL
Intermittent
SERVICE
sound
ENGINEER
6-5
External
relay
contact
(Note 1)
Minor
Minor
Minor
Minor
Minor
Minor
Minor
Minor
Major
Major
Major
Minor
Minor