Debugging specification
62
6.1.3 Photovoltaic special function parameter group:F12
F12.00
Photovoltaic water supply model
Range: 0
～
2
1
0:Pv parameter set is invalid, frequency conversion enters debugging mode.
1:Mppt Mode
2:CVT Mode.
When F12.00=1 and 2, the frequency converter runs in photovoltaic mode,
and when F12.00=2, the frequency converter runs in CVT mode. After running, the voltage of the
converter maintains the target voltage which is determined by F12.04.When F12.00=1, the
frequency converter will automatically track the maximum power point of photovoltaic panels
within the range which is determined by F12.01 and F12.02.
F12.01
Ceiling voltage
Range:80.0
～
100.0%
90.0%
This parameter defines Mppt mode search upper limit voltage =F12.01* open circuit voltage.
F12.02
Ceiling voltage
Range:50.0
～
80.0%
50.0%
This parameter defines Mppt mode search Lower limit voltage =F12.02* open circuit voltage.
F12.03
Search interval
Range:0.0
～
100.0s
1.0s
This parameter defines the search interval time in Mppt mode.If the value is too high, the
inverter will take a long time to track to the maximum power point of photovoltaic panel.
F12.04
Voltage increase threshold
Range:0.5
～
30.0%
0.5%
This parameter defines the varying voltage within the search interval in Mppt mode.
F12.05
Proportional gain Kp
Range:0.00
～
100.00
Determine by VFD type
F12.06
Integral gain Ki
Range:0.01
～
10.00
Determine by VFD type
F12.07
Differential gain Kd
Range:0.00
～
10.00
Determine by VFD type
F12.05 ~ F12.07 define PID coefficients in photovoltaic mode.
The bigger the Kp, the faster the response, but if it is too bigger, the more likely to oscillate.
The bias cannot be completely eliminated by only using proportional gain Kp. In order to
eliminate residual bias, integral gain Ki can be adopted to form PI control.The larger the Ki, the
faster the deviation response, but the larger the Ki is, the more likely it is to produce oscillation.
F12.08
CVTtarget voltage
Range:50.0
～
100.0%
80.0%
This parameter define target voltage =F12.08* open circuit voltage under photovoltaic CVT
mode.
F12.09
Ways to protect
downtime
Range:00
～
1F
BIT0:Low-frequency protection
（
A-42
）
BIT1:Dry pumping protection
（
A-43
）
BIT2:Overcurrent protection
（
A-44
）
BIT3:Minimum power protection
（
A-45
）
BIT4:Full-water protection
（
A-46
）
0000
This parameter defines the low-frequency protection, dry pumping protection, overcurrent
protection, minimum power protection, water full protection alarm and other ways of stopping.
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