Alarm
Name
Measures
Recommended
Causes
The LED is solid on in case of inverter fault, refer to Table 8.2 for details.
Grid
Over
Voltage
Grid
Under
Voltage
Over
Frequency
Under
Frequency
PV
Over
Voltage
The
grid
voltage
exceeds
the
permissible
range
.
PV
modules
input
voltage
exceeds
the permissible
range
.
1
.
If
the
alarm
occurs
accidentally
,
possibly
the
power
grid
is
abnormal
accidentally
.
No
extra
action
is
needed
.
2
.
If
the
alarm
occurs
repeatedly
,
contact
the
local
power
station
.
After
receiving
approval
of
the
local
power
bureau
,
revise
the
electrical
protection
parameters
setting
on
the
inverter
through
ChintHome
APP
.
3
.
If
the
alarm
persists
for
a
long
time
,
check
whether
the
AC
circuit
breaker/AC
terminals
is
disconnected
or
not
,
or
if
the
grid
has
a
power
outage
.
Check
the
number
of
PV
modules
and
adjust
it
if
needed
.
PV
Under
Voltage
PV
modules
input
voltage
is
under
the
inverter’s
defaulted
protection
value
.
1
.
When
sunlight
intensity
weakens
,
PV
modules
voltage
decreases
.
No
extra action
is
needed
.
2
.
If
such
phenomena
occurs
when
sunlight
intensity
does
not
weaken
,
check
if
there
is
short
circuit
,
open
circuit
etc
.
in
the
PV
strings
.
Insulation
Resistance
Abnormal
A
short circuit
exists
between
PV
strings
and
protection
ground
.
PV
strings
are
installed
in
a
long-term
moist
environment
.
1
.
Check
the
insulation
resistance
against
the
ground
for
the
PV
strings
.
If
a
short
circuit
has
occurred
,
rectify
the
fault
.
2
.
If
the
insulation
resistance
against
the
ground
is
less
than
the
default
value
in
a
rainy
environment
,
set
“Insulation
Resistance
Protection
"
parameter on
ChintHome.
39
CPS SCA-
T Series Inverter
8
.
2
The Inverter Troubleshooting
Summary of Contents for CPS SCA-T Series
Page 37: ...CPS SCA T Series Inverter 34 ...