Huawei SUN2000-8KTL User Manual page 124

SUN2000 (8KTL-28KTL)
User Manual
Alarm ID Name
305 Frequency
Abnormal
Low Array
313
Insulation
Resistance
318 Residual
Current
Abnormal
321 Cabinet
Over-Tem
p
Issue 10 (2017-07-30)
Severity Causes
Major The actual frequency of the
grid is higher than or lower
than the required value for the
local grid.
The insulation resistance
Major
against ground of the PV
strings is low. The possible
causes are as follows:
 There is a short circuit
between PV strings and the
ground.
 The PV strings are installed
in a permanently moist
environment.
Major The insulation resistance
against ground of the input
side of the SUN2000
decreases during operation,
which causes excessively high
residual current.
Major  The SUN2000 is installed
in a place with poor
ventilation.
 The ambient temperature is
too high.
 The internal fan is not
working.
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8 Maintenance
Measures
a. If the alarm occurs accidentally,
it is possible that there is an
accidental grid abnormality. The
SUN2000 automatically reverts
to normal operating status after
the fault is rectified.
b. If the alarm occurs repeatedly,
check whether the grid frequency
is within the allowed range. If
yes, change the grid
overfrequency and
underfrequency protection points
after obtaining approval from the
local power operator. For details
about how to change the
protection points, see
Setting Protection Parameters. If
the grid frequency is not within
the allowed range, contact the
local power operator.
a. Check the insulation resistance
against the ground of the PV
strings. If there is a short circuit,
rectify the fault.
b. If the insulation resistance
against the ground is less than the
default value in a rainy
environment, set the ISO value.
For details, see 7.2.9 Setting
Protection Parameters.
a. If the alarm occurs accidentally,
it is possible that there is an
accidental external circuit
abnormality. The SUN2000
automatically reverts to normal
operating status after the fault is
rectified.
b. If the alarm occurs repeatedly or
lasts a long time, check whether
the insulation resistance against
ground of PV strings is too low.
Check whether the ambient
temperature for the SUN2000
exceeds the upper limit. If so,
improve ventilation to decrease the
temperature.
7.2.9
117