Mitsubishi Electric 9900D Series Owner Technical Manual page 63

Table 7.1 Bypass Module Fault Code List
Code
Status
indication
Message
(Note 2)
UF384 CTRL.CIRCUIT ERR.
UF385 CTRL.CIRCUIT ERR.
UF386 LCD FAULT
UF401 52S ABNORMAL
UF402 52S ABNORMAL
52L OPERATION
UF420
ERR.
UF451 52S ABNORMAL
UF452 CB3 ABNORMAL
STS TEMP.
UF453
ABNOMAL
9900D SERIES UPS
OWNERS / TECHNICAL MANUAL
Meaning
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.
Communication error with LCD
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.
Thyristor temperature abnormal
MITSUBISHI ELECTRIC 9900D SERIES UPS
Page Number:
Audible
Guidance
Alarm
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
CALL
Intermittent
SERVICE
sound
ENGINEER
7-6
External
relay
contact
(Note 1)
Minor
Minor
Minor
Major
Major
Major
Minor
Minor
Minor