Koyoe KY-EST06KH, User Manual

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Appendix I: Common Problems
In case the inverter will not work normally at times, solutions to common problems are listed
below. This will help technicians understand problems and take effective measures.
Item LCD display Possible Causes and Solutions
1
GFCI Fault 1. The grounding current is too high.
2. After disconnecting the AC side circuit, pull out the
photovoltaic cell at the input end and detect the
peripheral equipment of the AC system.
3. After removing the fault, reconnect the PV panel and
AC side circuit to detect the inverter status.
2
BMS
Communication
Fault 1. Communication between the battery pack and the
inverter failed.
2. Check whether the communication cable is
connected correctly and reliably.
3. Restart the inverter after replacing the connecting
cable.
3
SPI
Communication
Fault 1. Master-slave DSP communication failure, please
restart the inverter.
2. If it cannot work properly after reboot, please contact
customer service
4
PV Overvoltage
Fault 1. PV overvoltage fault, please check the PV input
voltage, voltage value must be less than
1000
V.
5
Isolation Fault 1. Check whether the inverter is effectively earthed and
whether the impedance between the positive and
negative poles of the photovoltaic cell is greater than
1M
Ω;
2. Check whether the AC side is connected to the earth.
6
Grid Voltage
Fault 1. Please check whether the network voltage is too low
or too high.
2. Restart the inverter after the power grid is normal
7
Grid Frequency
Fault 1. Please check whether the grid frequency is too low
or too high.
2. Restart the inverter after the power grid is normal
8
Bus Voltage
High 1. Bus voltage is high, please check whether the PV
input voltage is less than
1000
V.2. If the fault cannot be
cleared after restarting the inverter, please contact
customer service.
9
Off Grid Over
Voltage Fault 1. High off-grid output voltage.
2. Please check whether the off-grid port is connected
correctly and whether the off-grid load is working
normally.
10
Battery Over
Temperature
Fault 1. Battery temperature is too high.2. Please confirm
whether the battery is placed in a high temperature
area.3. Please restart the inverter after the battery cools
down.