MITSUBISHI ELECTRIC 9900B SERIES UPS
MITSUBISHI
ELECTRIC
9900B SERIES UPS
OWNERS / TECHNICAL MANUAL
Page Number:
6-4
Table 6.1 (continuation)
Code
indication
(Note 3)
Status
message
Meaning
Guidance
Buzzer
External
relay contact
(Note 1)
Failure
lamp
(Note 2)
UF103
DC
UNDERVOLTAGE
DC voltage dropped below
the undervoltage level.
CALL
SERVICE
ENGINEER
Continuous
sound
Major
Lit on
UF108
CHOPPER
OVERCURRENT
Detection of DC overcurrent.
CALL
SERVICE
ENGINEER
Continuous
sound
Major
Lit on
UF109
DC
UNBALANCED
Major unbalance of the
neutral point voltage.
CALL
SERVICE
ENGINEER
Continuous
sound
Major
Lit on
UF110
ZERO PHASE
OVERCURRENT
Detection of converter
zero-sequence overcurrent.
CALL
SERVICE
ENGINEER
Continuous
sound
Major
Lit on
UF111
UPS CONTROL
CIRCUIT ERROR
Battery current unbalance.
CALL
SERVICE
ENGINEER
Continuous
sound
Major
Lit on
UF112
DC CIRCUIT
ABNORMAL
Sudden change of the DC
voltage level.
CALL
SERVICE
ENGINEER
Continuouss
ound
Major
Lit on
UF119
DC GROUND
FAULT
Detection of DC ground
fault.
CALL
SERVICE
ENGINEER
Continuous
sound
Major
Lit on
UF128
CONTROL
POWER SUPPLY
ABNORMAL
Power supply voltage to
IGBT driver PCB is below
the specified level.
CALL
SERVICE
ENGINEER
Continuous
sound
Major
Lit on
UF151
DC VOLTAGE
ABNORMAL
24 hours after input power
restoration, batteries does
not reach float voltage level.
CALL
SERVICE
ENGINEER
Intermittent
sound
Minor
Flicker
UF152
DC VOLTAGE
ABNORMAL
Unable to equalize the
voltage of various batteries
after 24 hours.
CALL
SERVICE
ENGINEER
Intermittent
sound
Minor
Flicker
UF154
CB2 ABNORMAL
During UVT, status signal
from CB2 is ON.
CALL
SERVICE
ENGINEER
Intermittent
sound
Minor
Flicker
UF156
CHG.STOPPED
(BATTERY
OVERTEMP.)
UF157 failure persisted for
over 2 hours.
CHECK
BATTERY
Intermittent
sound
Minor
Battery
abnormal
Flicker
UF157
BATTERY
OVERTEMPERA
TURE
Detection of
overtemperature at the
batteries.
CHECK
BATTERY
Intermittent
sound
Minor
Battery
abnormal
Flicker
UF158
BATTERY LIQUID
LOW
Low level of battery
electrolyte solution.
CHECK
BATTERY
Intermittent
sound
Minor
Battery
abnormal
Flicker
UF159
DC GROUND
FAULT
Detection of DC ground
fault.
CALL
SERVICE
ENGINEER
Intermittent
sound
Minor
Flicker
UF160
UPS CONTROL
CIRCUIT ERROR
Abnormal behavior of DC
current sensor.
CALL
SERVICE
ENGINEER
Intermittent
sound
Minor
Flicker
UF161
CHG.STOPPED
(DC VOLT.
ABNORMAL)
UF151 failure is running for
over 24 hours.
CALL
SERVICE
ENGINEER
Intermittent
sound
Minor
Flicker
UF162
BATTERY
ABNORMAL
Failure detection based on
battery self-check.
CALL
SERVICE
ENGINEER
Intermittent
sound
Minor
Flicker
Summary of Contents for 9900B Series
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