Make
sure
no
block
on
air
-
flow
around
the
controller
.
Clear
up
any
dirt
and
fragments
on
radiator
.
Check
all
the
naked
wires
to
make
sure
insulation
is
not
damaged
.
Repair
or
replace
some
wires
if
necessary
.
Tighten
all
terminal
screws
to
the
indicated
torque;
Inspect
for
loose
,
broken
,
or
burnt
cable
/
wire
connections.
Check
and
confirm
that
LCD
is
consistent
with
required
.
Pay
attention
to
any
troubleshooting
or
error
indication
.
Take
corrective
action
if
necessary
.
Make
sure
all
system
components
are
effectively
and
tightly
connected
to
ground.
Check
all
terminals
for
any
corrosion
signs
,
damaged
insulation
,
increased
temperature
or
carbonization
/
discolored
signs
.
Check
for
any
dirt
,
nesting
insects
and
any
corrosion
signs
.
Implement
corrections
actions
as
early
as
possible
.
WARNING：Risk of electric shock!
Make sure that all the power is turned off before above operations,
and then follow the corresponding inspections and operations.
7
.3 Maintenance
For
best
system
performance
,
the
following
inspections
and
maintenance
tasks
are
recommended
to
be
carried
out
for
at
least
two
times
a
year.
7
.
2
Protection
PV Short Circuit
PV Reverse Polarity
Charging over current
The controller will limit charging current on battery to the rated level.
When PV short circuit occurs, the controller will stop charging.
Remove
it to
resume
normal
o
peration.
Fully protection against PV reverse polarity, no damage to the controller.
Correct the connection to resume normal operation.
Fully protection against battery reverse polarity, no damage to the controller.
Correct the connection to resume normal operation.
Should there are other energy sources to charge the battery
,
when
the
battery
voltage
exceeds
15
.
8
/
31
.
3 / 46.8 / 62.3V
(
Overcharge
protection
voltage
of
lithium
battery
equals
target
voltage
plus
0
.
2V), the
controller
will
stop
charging
to
protect
the
battery
from
overcharging
damage
.
When
battery
v
oltage
d
rops
t
o
t
he
low
v
oltage
d
isconnect
s
etting, the
c
ontroller
w
ill
s
top
d
ischarging
t
o
p
rotect
t
he
b
attery
f
rom
o
ver
d
ischarging
d
amage
.
If the load current exceeds the maximum load current rating 1.
25
times, the
controller will disconnect the load.
Once the load short
circuit happens
, the load short
circuit
protection will
trigger
automatically.
The controller detects the internal temperature through internal sensor, when
the temperature exceeds the setting value, the charging current will decrease,
and consequently, the controllers temperature; Should controllers temperature
rise and approach over temperature protection threshold, the controller will
stop its operation and resume after temperature lowers/returns to an
acceptable level.
Should
the
temperature
sensor
be
short
-
circuited
or
damaged
,
the
controller
will
be
charging
or
discharging
at
the
internal
temperature automatically
to
prevent
the
battery
damaged
from
overcharging
or
over
discharged
.
Protection
Description
Battery Reverse Polarity
Battery Over voltage
Battery Over discharge
Load Over Current
Protection
Load Short Circuit
Protection
Over Temperature
Protection
Damaged Remote
Temperature Sensor
16
!
the existing fault .
Two or more errors at the same time can damage the controller, so you must troubleshoot