System Manual
11 Troubleshooting
79
Alarm
RISO-flt
Possible
reason
The MV Station DC side insulation resistance is lower than the set value.
Measure
Check the PV panel insulation to the ground when the MV Station is voltage-free
Remark
Only alarm display. The MV Station can operate normally.
Fault
PM-high
Possible
reason
Module temperature exceeds the permitted value
Measure
Check the module and ventilation after the device is voltage-free
Remark
Stop the device if this fault occurs 5 times per day
Fault
I leakage pro
Possible
reason
The ground protection is activated when the MV Station AC leakage current to
the ground is more than 5A (value can be set through the LCD).
Measure
-
Remark
The MV Station can automatically reconnect to the grid and start operation when
the leakage current to the ground returns normal.
Fault
Overload pro
Possible
reason
Capacity of the DC side panel is overload
Measure
It is advisable to stop the device and disconnect half of the DC switches.
Remark
Contact Sungrow
Fault
Soft Start flt
Possible
reason
A fault occurs during the soft start process.
Measure
Stop the device to check and service.
Remark
Contact Sungrow
Fault
T&H-com flt
Possible
reason
Temperature and humidity sensor communication fault.
Measure
Stop the device to check and service the temperature and humidity sensor and
the cable connection.
Remark
Contact Sungrow
Fault
L over-temp
Possible
reason
Reactor temperature exceeds the permitted value
Measure
Check the reactor after the device is voltage-free
Remark
-
Fault
PV pol-rev
Possible
reason
The positive and negative polarities of the DC side are connected reversely.
Measure
Check the DC connection to for reverse connection after the MV Station
voltage-free
Remark
-
