Event 039 (Sunny Portal: 3501)

Event message:

• Low system insulation resistance

Explanation:

Generally, the fault is caused by poor insulation of the module/cable to ground or by rainfall and a moist environment.

Corrective measures:

• Check whether the ISO insulation conservation value is excessively high and ensure it complies with the local requirements.

• Check the resistance of the DC string or DC cable to ground. Rectify the fault if a short circuit or a damaged insulating layer is present.

• If the cable shows no abnormalities and the fault occurs on rainy days, check again when the weather is good.

• If the fault cannot be rectified using the indicated corrective measures, contact Service.