Sungrow SG125HX, User Manual, Page: 20 / 103

10
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Anti-PID function
When the inverter is running, the PID module rises the potential between the negative
pole of the PV array and the ground to a positive value, to suppress the PID effect.
Make sure the inverter is applied to an IT system before enabling the anti-PID
function.
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PID recovery function
For positive voltage scheme, after the PID is enabled, the voltage to ground of all PV
strings is greater than 0, and therefore the PV string-to-ground voltage is a positive
value.
For negative voltage scheme, after the PID is enabled, the voltage to ground of all PV
strings is lower than 0, and therefore the PV string-to-ground voltage is a negative value.
•
Before enabling the PID recovery function, make sure the voltage polarity of
the PV modules to ground meets requirement. If there are any questions,
contact the PV module manufacturer or read the corresponding user manual.
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If the voltage scheme for the PID protection/recovery function does not meet
the requirement of corresponding PV modules, the PID will not work as
expected or even damage the PV modules.
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If the PID recovery function is enabled, it only works at night.
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PID recovery function and Q at night cannot be enabled at the same time.
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After the PID recovery function is enabled, the voltage of the PV string to
ground is 500Vdc by default, and the default value can be modified through
the App.
2 Product Description User Manual