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10.7 Intelligent Temperature-Control Technology
The inverter will continuously detect the IGBT temperature and adjust the fan speed
accordingly. When the module temperature is low, the inverter will decrease the fan
speed to lower the device noise and decrease the device operation consumption. As
the module temperature increases, the inverter will increase the fan speed for better
heat dissipation.
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”.
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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.
System Manual
