Mitsubishi Electric 9900B Series Owner Technical Manual page 70

MITSUBISHI
ELECTRIC
Table 6.1 (continuation)
Code
Status
indication
message
(Note 3)
CONTROL
UF352 POWER SUPPLY
ABNORMAL
UPS CONTROL
UF363
CIRCUIT ERROR
UPS CONTROL
UF371
CIRCUIT ERROR
UPS CONTROL
UF372
CIRCUIT ERROR
UPS CONTROL
UF374
CIRCUIT ERROR
UPS CONTROL
UF375
CIRCUIT ERROR
UPS CONTROL
UF376
CIRCUIT ERROR
UPS CONTROL
UF377
CIRCUIT ERROR
UPS CONTROL
UF378
CIRCUIT ERROR
UPS CONTROL
UF379
CIRCUIT ERROR
UF401 52S ABNORMAL
UF402 52S ABNORMAL
52L OPERATION
UF420
ERROR
UF451 52S ABNORMAL
UF452 CB3 ABNORMAL
(Note 1) 1) "Major" is defined as a major failure. The load is transferred from the inverter circuit to
the static bypass line.
2) "Minor" is defined as a minor failure. The UPS continues to operate normally, but the
cause of alarm must be identified.
(Note 2) Indicates one of two possible LED illumination patterns - continuously on (lit on) or
intermittent (flicker).
9900B SERIES UPS
OWNERS / TECHNICAL MANUAL
Meaning
Backup control power
supplies exhibit abnormal
condition.
Synchronization status
signal is being received for a
considerable time.
Minor communication error
during parallel operation.
Unable to synchronize the
inverter output and the
bypass voltage.
Cable disconnection in the
parallel interface board.
Unable to achieve
synchronization for parallel
operation.
No control response from
another UPS although its
detection is possible.
Overload detection signal is
being received continuously
for a considerable time.
No answer for sending
synchronizing signal.
Abnormal clock speed of the
parallel control board
processor.
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 9900B SERIES UPS
Guidance Buzzer
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
Intermittents
SERVICE
ound
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
Continuous
CHECK 52L
sound
CALL
Intermittent
SERVICE
sound
ENGINEER
CALL
Intermittent
SERVICE
sound
ENGINEER
Page Number:
6-7
External Failure
relay contact lamp
(Note 1) (Note 2)
Minor Flicker
Minor Flicker
Minor Flicker
Minor Flicker
Minor Flicker
Minor Flicker
Minor Flicker
Minor Flicker
Minor Flicker
Minor Flicker
Major Lit on
Major Lit on
Major Lit on
Minor Flicker
Minor Flicker