Reason ID = 1 to 6
The grid A, B, or C phase
voltage is less than the
allowed range.
Reason ID = 13 to 18
The grid A, B, or C phase
voltage is higher than the
allowed range.
Reason ID = 26
The grid voltage is higher
than the allowed range.
Reason ID = 27 or 28
There is large difference in
grid voltage among the
three phases.
Reason ID = 29
The grid has a power
outage, or the AC line or
the AC circuit breaker is
disconnected.
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 voltage is
within the allowed range. If so,
change the grid overvoltage and
undervoltage protection points
after obtaining approval from the
local power operator. For details
about how to change the
protection points, see 7.2.9
Setting Protection Parameters. If
the grid voltage is not within the
allowed range, contact the local
power operator.
c. If the alarm persists for a long
time, check that the AC circuit
breaker and output cables of the
SUN2000 are properly
connected.
Reason ID = 13 to 18, or 26
a. Check whether the grid-tied point
voltage is too high. If it is,
contact your local power
operator.
b. If the grid-tied point voltage is
higher than the allowed range,
change the overvoltage and
undervoltage protection points
after obtaining approval from the
local power operator.
c. Check whether the grid voltage
peak is too high.
Reason ID = 27 or 28
a. The SUN2000 monitors its
external working conditions in
real time and automatically
reverts to normal operating status
after the fault is rectified.
b. If the alarm occurs repeatedly
and affects the normal power
generation of the power station,
contact the local power operator.
Reason ID = 29
a. Check whether the AC voltage is
normal.
b. Check whether the AC line or
circuit breaker is disconnected.
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