SMA SMC 9000TL Installation - Manual (Page 72)

72 SMC9-11TLRP-IA-en-51 Installation Manual
10 Troubleshooting SMA Solar Technology AG
5. Commission the inverter (see section 8 "Commissioning", page 51).
EinlSatz_PV-Anlage auf Erdschluss prüfen
If the red LED is glowing and the inverter displays the message Riso, there is an earth fault in the
PV array. The electrical insulation between the PV plant and earth is defective or insufficient.
4.
Damage to the inverter due to moisture and dust intrusion
If the ESS is not plugged in or incorrectly plugged in during operation, moisture and dust can
penetrate the inverter. If the ESS is not correctly plugged in, this can cause contacts in the ESS
to wear or the ESS might fall out of the socket. This can result in yield loss and damage to the
ESS.
Always plug in the ESS as follows:
• Firmly plug in the ESS until it is flush with the
enclosure.
• Ensure that the gap between the ESS and the
enclosure is no more than 1 mm.
10.7 Checking the PV Plant for Earth Faults
Danger to life due to electric shock
In the event of an earth fault, high voltages can be present.
• Only touch the insulation of the PV array cables.
• Do not touch any parts of the sub-structure or frame of the PV array.
• Do not connect PV strings with earth 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.