SMA WB 3000-21 Installation - Manual (Page 71)

SMA Solar Technology AG 11 Troubleshooting
Installation Manual WB3-5TL-21-IA-en-10 71
11.4 Checking the Small Wind Turbine System for Ground Faults
If the inverter displays the event numbers 3501, 3601 or 3701, there could be a ground fault.
Check the small wind turbine system for ground faults according to the following procedure.
1. Disconnect the inverter from voltage sources (see Section 9).
2. Disconnect the Windy Boy Protection Box from voltage sources (see installation manual of the
Windy Boy Protection Box).
3. Measure resistances:
• Measure resistance between L1 of the small wind turbine system and the ground potential,
and record value.
• Measure resistance between L2 of the small wind turbine system and the ground potential,
and record value.
• Measure resistance between L3 of the small wind turbine system and the ground potential,
and record value.
If the measured resistances are smaller than 10 Ω , there is a ground fault present.
Eliminate the ground fault.
If the measured resistances are almost infinite, there is no ground fault present in the small wind
turbine system. Ensure that there is no ground fault in the connection cables on the inverter.
4. Re-commission the inverter (see Section 10).
Danger to life due to electric shock
In the event of a ground fault, high voltages can be present.
• Only touch the cables of the small wind turbine system on their insulation.
• Do not connect DC cables with ground faults to the inverter.
Destruction of the measuring device due to overvoltage
• Only use measuring devices with a DC input voltage range up to at least 1,000 V.