SUN2000-(25KTL, 30KTL)-US
User Manual
8 Maintenance
Issue 03 (2017-04-01)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
91
Alarm ID Alarm
Name
Alarm
Severity
Causes
Measures
120 to 125
String 1-6
Reverse
Cause ID
= 1:
major
Cause ID
= 2:
warning
Cause ID = 1
The PV string is reversely
connected.
Cause ID = 2
Only a few PV modules are
connected in series to the
PV string, and hence the
end voltage is lower than
that of other PV strings.
Cause ID = 1
Check whether the PV string is
reversely connected to the
SUN2000. If yes, turn off the two
DC switches after the PV string
voltage drops within the safe
voltage range (lower than 60 V
DC), and then correct the PV
string connection.
Cause ID = 2
Check whether the number of PV
modules connected in series to
the SUN2000 is small. If yes,
increase the number.
200
DC Bus
Voltage
Fault
Major
Abnormal external conditions
trigger the protection for the
DC circuit inside the SUN2000.
The possible causes are as
follows:
Reason ID = 3
The SUN2000 input is
suddenly disconnected, or
the PV strings shielded
result in a sharp change in
output power.
Reason ID = 10
The internal control circuit
of the SUN2000 has failed
to keep pace with changes
due to grid phase
imbalance.
Cause ID = 11
The input energy of the
SUN2000 cannot be vented
quickly due to the sharp
change of grid voltage. As a
result, the internal voltage
increases.
Cause ID = 12/15
An unrecoverable fault
occurs on a circuit inside
the inverter.
Cause ID = 3/10/11
−
The SUN2000 monitors its
external working conditions in
real time and automatically
recovers to the normal
operating status after the fault
is rectified.
−
If the alarm persists, contact
Huawei technical support.
Cause ID = 12/15
Turn off the AC output switch
and DC input switch, and then
turn them on after 5 minutes. If
the fault persists, contact Huawei
technical support.
