79
F
Fa
au
ulltt
n
na
am
me
e
E
Exxp
plla
an
na
attiio
on
n
F
Fa
au
ulltt
sse
evve
erriittyy
M
Me
ea
assu
urre
ess
V-
midpoint
offset
Neutral point
potential shifting
occurs on the
DC side of the
module.
Major
1. Check whether the DC side of the
module is short-circuited, the input
voltage falls beyond the permissible
range, and the grid voltage is normal.
2. Check the history fault screen of the
LCD to ensure whether faults such as
DC overvoltage/undervoltage, PDP, and
AC overcurrent exist at the same time. If
so, refer to the corresponding
measures.
Temp-flt
The fault occurs
when the
temperature at
the air inlet is
higher than the
protective
threshold.
Major
1. Ensure the ambient temperature.
Check, with a thermodetector, whether
the present ambient temperature is
within the permissible range of the
module.
2. Check that the air inlets of the
inverter and inverter are not obstructed.
Replace the filters when necessary.
3. Check, in the S
Stto
op
p mode, whether
fans inside the module are clogged by
foreign materials.
DC
cabinet
over-
temp
The temperature
in the DC
cabinet is
excessively high.
Major
Refer to the measures for "Temp-flt".
Vac-high
The grid voltage
is higher than
the set
protective
threshold.
Major
1. Tap "Set-parameters" -＞ "Pro-
parameters" on the LCD to check
whether the protection parameter is in
compliance with the local standards
and regulations.
2. Disconnect the AC switches, and
check whether the actual grid voltage is
within the normal range.
3. Check, in the S
Stto
op
p mode, whether
the grid voltage displayed on the LCD is
consistent with the voltage actually
measured.
System Manual
