Frequently Asked Questions - Goodwe GW250K-HT User Manual

6 Frequently Asked Questions

Normally, the inverter requires no maintenance. If the inverter cannot work normally, refer to the following
instructions:
• When something is wrong, the red indicator on the operation panel will light up, and relevant information will
be listed on the APP. Refer to the table below for more details.
Type Display
1. Disconnect the DC switch and remove the DC connector,
then check the impedance of the positive and negative poles of
the DC connector to the earth.
2. If the impedance is lower than 100 kilohm, check the
Isolation Failure
impedance of the PV string to the earth.
3. If the impedance is higher than 100 kilohms, call the local
service center.
4. Remove the AC connector and check the impedance of the N
wire to the earth wire. If higher than 10 ohms, check the AC
connection.
1. Disconnect the DC switch and check the insulation of the
Gnd I Fail
PV string to the earth.
2. Turn on the DC switch after checking.
3. Call the local service center if the fault resists.
1. Disconnect the DC switch and open the AC junction box to
measure the voltage on the live wires and between the live
System
Grid voltage
wires in the connector. To confirm whether the voltage
Errors
abnormality
matches with the grid-tied inverter specifications.
2. If it does not match, check the network cables.
3. If it matches, connect the AC connector and turn on the DC
switch. The inverter will recover automatically. Call the local
service center if the fault resists.
1. If the grid frequency returns to a normal state, the inverter
will automatically recover.
Fac Failure
2. Call the local service center if the fault resists.
1. Disconnect the DC switch and open the AC junction box to
measure the voltage on the live wires and between the live
wires in the connector. To confirm whether the voltage
matches with the grid-tied inverter specifications.
Utility Loss
2. If not, check whether the distribution switch is turned off
and whether the power supply is operating normally.
3. If it matches, connect the AC connector and turn on the DC
switch. The inverter will recover automatically. Call the local
service center if the fault resists.
25
Troubleshooting
Type Display
1. Disconnect the DC switch and remove the DC
connector to measure the PV string voltage. Confirm
whether it exceeds the inverter input voltage specifica-
PV Over Voltage
tion.
2. If yes, reconfigure the PV string.
3. If not and the fault persists, call the local service
center.
Relay Fail
DCI High
EEPROM Fail
1. Disconnect the DC switch.
Inverter
2. Turn on the DC switch.
Failures
3. Call the local service center if the fault persists.
Internal Communication
Failure
DC Bus High
GFCI Device Check Failure
1. Disconnect the DC switch, remove the DC connector,
and measure the PV string voltage.
2. Connect the DC connector, and then turn on the DC
No display
switch.
Other
(Indicator and display
Failures
3. If the voltage is lower than 500 V, check the PV string
are not lit)
configuration.
4. If the voltage is higher than 500 V but still no display,
call the local service center.
Note: When the sunlight is insufficient, the inverter may start up frequently. This is caused by
insufficient PV string power and will not cause damage to the inverter.
Troubleshooting
26