Sungrow SG3425UD-MV, Системное руководство

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81
Fault
name
Explanation
Fault
severity
Measures
L over-
temp
The reactor
temperature is
excessively high.
Major
1. 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 MV
Station are not obstructed. Replace the
filters when necessary.
3. Check, in the Stop mode, whether fans
inside the module are clogged by foreign
materials.
Temp
control
cabinet flt
Faults occur due
to excessively
high temperature
inside the control
cabinet.
Major
1. Check the grid voltage, and inspect
whether the grid voltage harmonic is
normal.
2. Check whether the fans operate
normally.
3. Check the AC filtering system, and
inspect whether the AC filter capacitor is
damaged, for example, cracked. Check
whether the 3-phase current of the
capacitor is in balance when necessary.
Vdc-Low
The DC input
voltage is
excessively low.
Major
1. Check, in the Stop mode, whether the
DC voltage displayed on the LCD is
consistent with the voltage actually
measured.
2. In the event of inconsistency, check
whether the circuits on the DC side are
short-circuited or connected incorrectly.
Bus
undervol-
tage
The DC bus
voltage is
excessively low.
Major
Refer to the measures for "Vdc-Low".
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.
System Manual 11 Troubleshooting