Anti-Pid Function Setting; Pid Repair; Insulation Monitoring Function; Introduction - Sungrow SG500MX Operation Manual

Operation Manual

8.9.2 Anti-PID Function Setting

For inverter with optional anti-PID function, the enable and disable of this function can
only be performed by personnel from Sungrow. Please contact Sungrow if you need to
switch this function.
Proceed as follows to set the mode if the Anti-PID mode is enabled:
Tap "Function" from the default menu;
Step 1
Tap "Set-parameter";
Step 2
Step 3 Tap "Pro-parameter" after entering the correct password;
Click Next to find the page with "Anti-PID mode" and select the mode by the drop-down list
Step 4
(Suppression/Repair)
Select according to the on-site situation.
Step 5

8.9.3 PID Repair

Please make sure the "Anti-PID mode" in the protection parameter of the inverter is
"Repair" when enabling the PID repair function.
If the inverter is in deep standby state or the repair process is interrupted, user can enable the
repair function manually from the LCD as follows:
Tap "Function" from the default menu;
Step 1
Tap "Set-parameter";
Step 2
Tap "Pro-parameter" after entering the correct password;
Step 3
Click Next to find the page with "PID repair" and click to enable the manual repair.
Step 4
If this function is enabled, the Work state in the main screen will show "Anti-PID run". User may
find the "Negative Vgnd" is about 500V from "Function/Run-information/Real Time Data"
If there is Key stop or Emergency stop or a device fault during the repair process, the
repair process will automatically stop.
8.10

Insulation Monitoring Function

8.10.1 Introduction

Insulation resistance is an important parameter related to 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 electric fire, device damage or even physical hazards. Sungrow inverter is
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