11 Troubleshooting
SMA Solar Technology AG
Operating manualSTPxx-US-50-BE-en-1188
11.3 Checking the PV System for Ground Faults
If the red LED is glowing and the event number 3501, 3601 or 3701 is being displayed in the
Results menu on the inverter user interface, there may be a ground fault present. The electrical
insulation from the PV system to ground is defective or insufficient.
DANGER
Danger to life due to electric shock when touching live system components in
case of a ground fault
If a ground fault occurs, parts of the system may still be live. Touching live parts and cables
results in death or lethal injuries due to electric shock.
• Disconnect the product from voltage sources and ensure it cannot be reconnected before
working on the device.
• Only touch the cables of the PV modules on their insulation.
• Do not touch any parts of the substructure or frame of the PV array.
• Do not connect PV strings with ground faults to the inverter.
• Ensure that no voltage is present and wait 5 minutes before touching any parts of the PV
system or the product.
WARNING
Danger to life due to electric shock from destruction of the measuring device
due to overvoltage
Overvoltage can damage a measuring device and result in voltage being present in the
enclosure of the measuring device. Touching the live enclosure of the measuring device results in
death or lethal injuries due to electric shock.
• Only use measuring devices with a DC input voltage range of 1000 V or higher.
Figure 13: Schematic diagram of the measurement
Required equipment:
☐ Suitable device for safe disconnection and short-circuiting
☐ Measuring device for insulation resistance
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