Debugging specification
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6.3 Introduction of protection function of photovoltaic inverter
(1) Sleep function
Under the photovoltaic mode, when the dc bus voltage is less than F12.11, the frequency
converter will enter the sleep state and the operating frequency will be reduced to 0.00Hz to
achieve the purpose of energy saving and motor protection, and A-47 warning will be displayed.
During the sleep state, when the dc bus voltage is bigger than F12.13 and maintained for F12.14
times, it will exit sleep state.
(2)
low-frequency protection function
Under the photovoltaic mode, when the output frequency of the inverter is less than the
frequency of F12.15, and the frequency is maintained for F12.16 times, the inverter will enter the
low-frequency protection state, and the operating frequency will be reduced to 0.00Hz, and A-42
warning will be displayed.The system is in the low-frequency protection state, and after
maintaining F12.14 times, it will exit the low-frequency protection state and start running again.
F12.15=0 or F12.16=0, this function is invalid.
(3) Minimum power protection function
In photovoltaic mode, when the output power of the inverter is less than F12.18 and
maintained for F12.19, the inverter will enter the state of minimum power protection. The
operating frequency will be reduced to 0.00Hz, and A-45 warning will be displayed.The system is
in the minimum power protection state, and after maintaining F12.20, it will exit the minimum
power protection state and restart operation.F12.18=0 or F12.19=0, this function is invalid.
(4) Overcurrent protection function
Under the photovoltaic mode, when the output current of the inverter is bigger than F12.21
and maintained for F12.22 time, the inverter will enter the overcurrent protection state.The
operating frequency will be reduced to 0.00Hz, and A-44 warning will be displayed.The system is
in the overcurrent protection state, and after maintaining F12.23, it will exit the overcurrent
protection state and start running again.F12.21=0 or F12.22=0, this function is invalid.
(5) Dry pumping protection function
Under the photovoltaic mode, when the output current of the inverter is less than F12.25 and
maintained for F12.26 time, the inverter will enter the protection state of pumping out. The
operating frequency will be reduced to 0.00Hz, and A-43 warning will be displayed. After the
system is in the protection state of pumping out and maintained for F12.27 time, it exits the
overcurrent protection state and starts running again. F12.25=0 or F12.26=0, this function is
invalid.
(6) Water full protection function
When the photovoltaic inverter is in operation, terminal No. 70 is effective, and after
maintaining F12.28 time, it enters the standby state of full water, and the keyboard warns "A-46".
When No. 70 terminal is invalid, and No. 71 terminal is effective and keeps longer than F12.29
time, the inverter will resume operation automatically.When F12.28=0, this function is invalid.
(7) Alarm mode
Select the alarm mode for low-frequency protection function, dry pumping protection
function, over-current protection function and minimum power function according to F12.24.
0: warning, automatic recovery.
1: fault, free stop.
(8) power curve / flow curve
Users can set parameters of F12.32 ~ F12.43 to realize display functions of real-time flow,
daily flow and cumulative flow.
The daily flow and daily generating capacity are calculated by default as 7h for one day, and
the time can be set by changing F12.44.
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