Huawei UPS2000-G-6KRTLL - Page 17

17
Alarm
ID
Alarm
Name
Severity Clearance
Condition
Trigger
Condition
Impact on
the System
Suggestion
23
Lithium
battery
low
voltage
protecti
on
Minor
The cell or
battery
string
voltage
rises above
the
protection
threshold.
The lithium
battery voltage
is less than 44
V.
The minimum
cell voltage is
less than 2.5 V.
The internal
switch circuit
of the
lithium
battery is
disconnected,
and the
battery
cannot be
charged or
discharged.
Possible cause: The
mains power has
failed and not been
recovered for a long
time. The cell
consistency is
abnormal. The
capacity attenuation
is too fast or the
internal resistance is
too large.
Measure: If the
lithium battery
cannot be recovered
due to protection
against abnormality,
contact local
Huawei engineers to
rectify the fault.
24
Lithium
battery
overcur
rent
protecti
on
Minor
The battery
discharge
current
drops below
the
protection
threshold.
Discharge
current ≥ 0.93
times of the
current limit
and
Vbus ≤ 40
V for 15s
Discharge
current ≥ 0.98
times of the
current limit
and
Vbus < 17
V for 8s
The internal
switch circuit
of the
lithium
battery is
disconnected,
and the
battery
cannot be
charged or
discharged.
Possible cause: The
UPS is overloaded.
The number of
working batteries is
insufficient.
Measure: Reduce the
load. Add batteries.
25
Lithium
battery
fault
Minor
The alarm is
not cleared.
After
batteries
are reset,
check the
status
again.
The cell voltage
sampling circuit
is faulty.
The cell
temperature
sampling circuit
is faulty.
The cell voltage
is too high or
too low.
The cell
temperature
increases
abnormally.
The cell voltage
is severely
unbalanced.
BMS board
circuit fault
The internal
switch circuit
of the
lithium
battery is
disconnected,
and the
battery
cannot be
charged or
discharged.
Possible cause:
sampling fault (see
the telecom power
manual); cell or
equalization circuit
fault; charger
converter short
-
circuit, relay fault;
switch tube fault
Measure: Restart the
lithium battery. If
the fault persists,
replace the lithium
battery.
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