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MITSUBISHI
ELECTRIC
Code
Status
indication
message
(Note 3)
TRANSFER
UA822
PROHIBITION
UA824
72B OPEN
52C OPE.
UA827
PROHIBITION
UA828
FAN ALARM
EMERGENCY
UA831
BYPASS SWITCH
ON
UA833
52L OPEN
BATTERY
UA834
DEPLETED/AC
OUT STOPPED
TRANSFER
UA835
PROHIBITION
52M
UA838
OPERATION
52M
UA839
OPERATION
REMOTE BUTTON
UA860
ABNORMAL
LOCAL BUTTON
UA861
ABNORMAL
BALANCER
UA870
OVERLOAD
UA890
EXTERNAL ALARM
INPUT CIRCUIT
UF001
ABNORMAL
CONVERTER
UF002
OVERCURRENT
CONVERTER
UF003
ABNORMAL
UF011
52RC ABNORMAL
UF052
52RC ABNORMAL
CONVERTER
UF056
OVERCURRENT
INPUT CIRCUIT
UF059
ABNORMAL
DC
UF102
OVERVOLTAGE
M9950 SERIES UPS
OWNERS / TECHNICAL MANUAL
Meaning
The UPS could not transfer to the
bypass
because
of
backup
generator operation.
The battery circuit breaker (72B)
is open.
The interlock for the inverter
output contactor (52C) is active.
Cooling fan abnormal.
Emergency bypass switch has
been turned on.
The load circuit breaker(52L) is
turned off.
The battery voltage has reached
the depleted level.
The UPS could not transfer to the
bypass
because
the
bypass
source has an abnormality.
Status of 52M ON and 52L open.
Status of 52M ON and 52L ON.
Remote start or stop signal is
being received continuously for a
considerable time.
Local start or stop signal is being
received
continuously
considerable time.
The UPS detected an neutral
point voltage unbalance.
External Alarm relay turned on.
Detection of a large variation of
the reference error signal.
Detection
of
converter
overcurrent.
Pre-charging circuit is not working
properly.
Major discrepancy between
reference signal and actual state
of contactor 52RC.
Minor discrepancy between
reference signal and actual state
of contactor 52RC.
Detection of converter
overcurrent.
Detection of a large variation of
the reference error signal.
DC voltage surpasses the
overvoltage level.
MITSUBISHI ELECTRIC M9950 SERIES UPS
Guidance
Buzzer
－
TURN ON
Intermittent
72B
sound
Intermittent
－
sound
Intermittent
－
sound
Intermittent
－
sound
Intermittent
－
sound
－
－
CALL
SERVICE
ENGINEER
CALL
SERVICE
ENGINEER
Intermittent
－
sound
Intermittent
－
for
a
sound
Intermittent
－
sound
Intermittent
－
sound
CALL
Continuous
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
CALL
Continuous
SERVICE
sound
ENGINEER
Page Number:
6-3
External
Failure
relay
Lamp
contact
(Note
(Note 1)
2)
－
－
Alarm
－
Alarm
－
Alarm
－
Alarm
－
Alarm
－
Alarm
Major
－
End-of-
Lit on
Discharge
－
－
Alarm
－
－
Alarm
－
－
Alarm
－
Alarm
－
Alarm
Alarm
－
Overload
－
Alarm
Major
Lit on
Major
Lit on
Major
Lit on
Major
Lit on
Minor
Flicker
Minor
Flicker
Minor
Flicker
Major
Lit on
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