SMA STP 8000TL-10 - Manual (Page 89)

SMA Solar Technology AG 12 Troubleshooting
Installation Manual STP8-17TL-IA-en-31 89
6. Insert an insertion tool into the openings of the
terminal contacts.
7. Insert new varistors into the slots by pushing them
down into the slots (as shown in the adjacent
diagram).
Make sure that the labelling is pointing to the front,
i.e. towards the insertion tool.
8. Dock the DC lid an at angle and then push on. The
captive screws must protrude.
9. Pre-screw all 4 screws of the DC lid and then tighten
them (torque: 3.5 Nm).
10. Restart the inverter (see Section 7 "Commissioning", page 58).
☑ The varistors have now been replaced and the inverter is back in operation.
Destruction of the inverter due to overvoltage
If varistors are missing, the inverter is no longer protected against overvoltages.
• Replacement varistors should be obtained as soon as possible.
• In PV plants with a high risk of overvoltages, never operate the inverter without varistors