Sungrow SG4950HV-MV, System Manual

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80
F Fa au ulltt
n na am me e
E Exxp plla an na attiio on n
F Fa au ulltt
sse evve erriittyy
M Me ea assu urre ess
Vac-low
The grid voltage
is lower than the
set protective
threshold.
Major Refer to the measures for "Vac-high".
F-fault
The grid
frequency is
abnormal.
Major
1. Tap "Set-parameters" -＞ "Pro-
parameters" on the LCD to check
whether the Protection parameter is in
compliance with the local standards
and regulations.
2. Check, in the S Stto op p mode, whether
the grid frequency displayed on the
LCD is consistent with the actual grid
frequency.
lsland/
No grid
Grid blackout
occurs or AC
transient voltage
exceeds the
protective
threshold.
Major
1. Check whether the grid is normal.
2. Check whether power outage occurs
on the AC side.
3. Check whether the AC circuit
breakers of the module are connected.
Ctrol
power
supply flt
The control
power supply is
abnormal.
Major
1. Check whether the control switches
of both the internal and external power
supply are in the ON or OFF positions.
If all switches are in the ON position,
disconnect a switch.
If all switches are in the OFF position,
connect a switch.
2. Check whether the internal and
external power supply terminals are
loose or poorly contacted. Fasten the
terminals when necessary.
Vdc-
samp-flt
The fault of DC
voltage
sampling occurs.
Major
Check, in the S Stto op p mode, whether the
DC voltage displayed on the LCD is
consistent with the voltage actually
measured.
Soft
start-flt
Failed to start
the inverter.
Major
Check whether the grid is normal, for
example, whether the grid harmonic
and grid voltage are balanced.
11 Troubleshooting System Manual