70
The intelligent temperature-control technology can synchronize the speed of fan and
temperature of the IGBT module and thus optimize the module temperature and other
conditions.
10.8 Insulation Monitoring Function
10.8.1 Introduction
Insulation resistance is a parameter important for safety operation. If the insulation
resistance is low, the direct contact protection and indirect contact protection may be failed;
meanwhile, the fault current against the ground and the short circuit caused by low
insulation resistance may lead to an electric fire, device damage, or even physical hazards.
Sungrow’s inverter is equipped with insulation resistance monitoring function to detect the
system insulation resistance in real time. If low resistance is detected, it will send alarm at
the first time to remind the user and prevent potential hazards.
10.8.2 Simple Troubleshooting
Regardless of the inverter setting, when the insulation resistance is below the threshold (can
be set on the LCD display), the inverter will send alarm signal and the Operation LED will
turn to yellow. After receiving the “low insulation resistance” alarm signal, the user should
stop the device and check the specific insulation resistance via the LCD screen “Function/
Run-information/Real time data”.
• If the insulation resistance recovers to be normal, the fault loop is on the AC side.
• If the insulation resistance is still low, the fault loop is on the DC side.
• Whether the fault is on the DC side or AC side, switch off the system and perform a
thorough checking and troubleshooting.
10.9 Protection Function
The inverter has complete protection functions to protect itself when input voltage or grid is
abnormal. After the anomaly is removed, the inverter can operate normally.
10.9.1 DC Over-voltage Protection
When the DC voltage of the PV array exceeds the max. DC voltage, the inverter will stop
operating, send warning signal, and display the fault type on the LCD screen.
The inverter can detect the abnormal voltage and respond quickly.
10.9.2 AC Over/under-voltage Protection
When the inverter AC output voltage exceeds the permissible range, the inverter will stop
feeding the grid, send warning signal, and display the fault type on the LCD screen.
The inverter can detect the abnormal voltage and respond quickly.
10 Main Functions System Manual
To Next Page
Loading...
Need help?
General