Sungrow SG4950HV-MV, System Manual

Page: 92 / 120

84
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
Current2
Unbalan-
ced/
Current3
Unbalan-
ced
AC current
unbalance
Major
Measure the grid voltage, to check
whether phase loss occurs.
AC
switch
breaking
AC switch is
disconnected.
Major
Connect the AC switch, after which the
alarm is cleared.
AC
cabinet
over-
temp
The temperature
in the AC
cabinet exceeds
the protective
threshold.
Major
1. Check whether fans in the AC
cabinet function normally.
2. Check whether air inlets of the AC
cabinet are obstructed.
3. Check whether filters at the air inlets
of the AC cabinet are dusty. Replace
the filters when necessary.
Anti-PID
power fit
Anti-PID power
supply is
abnormal.
Minor
1. Check the insulation of AC cables.
2. Check AC SPD.
3. Check the neutral point on the LV
side of the transformer and ensure it is
not grounded.
External
power
supply
External power
supply of the MV
Station is
abnormal.
Minor
Measure the external power supply
voltage with a multimeter to check
whether the voltage is within the normal
range.
Branch
breaker
flt
Circuit breakers
on DC branch
circuits are
abnormal.
Minor
Check whether all the branch circuit
breakers are closed, and check
whether the circuit breaker state
displayed on the Run-Information
screen of the LCD is " ON/Closed ".
CT
Unbalan-
ced
The three-phase
grid current is
unbalanced.
Minor
Check, via the LCD, whether the AC
three-phase current is in balance.
11 Troubleshooting System Manual