84
Fault
name
Explanation
Fault
severity
Measures
DC-SPD
flt
The SPD on the
DC side of the
module is faulty.
Major
The state window of the SPD is as
follows:
1. When the window colour is turned red
from green, it indicates that the SPD is
damaged (perhaps, due to
thunderstorms). In this case, measure the
AC and DC parameters, including
positive and negative pole voltages to
ground, and replace the SPD when the
parameters recover to normal value.
2. When the window is in normal colour,
the fault may be caused by poor contact
between the SPD and its base. In this
case, reinstall the SPD to ensure good
contact.
AC SPD
flt
The SPD on the
AC side of the
module is faulty.
Major
1. Refer to the measure for "DC-SPD flt".
2. Check whether the micro circuit
breaker connected in series to the SPD is
disconnected.
3. If the micro circuit breaker is
disconnected, measure the AC and DC
parameters. If the values measured are
normal, reconnect the micro circuit
breaker.
Vdc-high
The DC voltage
of the module
exceeds the
protective
threshold.
Major
1. Disconnect the DC switches of the
module, and check whether the open-
circuit voltage of the PV array is normal. If
it is abnormal, the alarm may result from
PV array configuration.
2. Ensure that the LV side of the
transformer is connected in the Y type,
and the neutral point is not grounded.
3. Check, in the
Stop
mode, whether the
DC voltage displayed on the LCD is
consistent with the voltage actually
measured.
System Manual
