SMA SC 500HE-20 Maintenance Manua - Manual (Page 9)

SMA Solar Technology AG 2 Safety
Maintenance Manual SC500-800HE20-WH-en-10 9
2 Safety
2.1 Safety Precautions
Electric shock
High voltages that can cause fatal electric shocks are present in the live components of the inverter.
• All work must be carried out as described in this manual. Observe all safety precautions.
Observe all safety precautions in this document and the inverter installation manual.
• Do not touch any live components in the inverter or the medium-voltage grid. Comply with all
applicable safety regulations for handling medium-voltage grids.
In the event of an earth fault, remember that plant components which are presumed earthed may still
be live.
• Ensure that no voltage is present before touching any part of the plant.
Hazardous voltages may still be present in the inverter even if the AC and DC main switches are
switched off.
• Wait at least 12 minutes after switching off the inverter. This allows the capacitors to perform
an electric discharge.
The insulation monitoring device with GFDI or remote GFDI does not provide protection from injury
when GFDI is activated. PV modules that are earthed by GFDI discharge voltage to earth. Entering
the PV field can lead to lethal electric shocks.
• Before entering the PV field, switch the PV modules to insulated operation.
• Ensure that the insulation resistance of the PV field is greater than 1 k Ω .
Operating a damaged inverter can lead to serious injuries from electric shock.
• Only use the inverter when it is working safely and properly and check for visible damage on
a regular basis.
• Ensure that all external safety equipment is freely accessible at all times and that regular checks
are carried out to ensure that it is fully functional.
Escape routes
Opening the doors of 2 inverters located opposite each other blocks the escape route.
• Only open 1 inverter door at any given time. Maintain the minimum passage width between the
open door of the inverter and the next fixed obstacle. The minimum passage width must comply
with national standards. In Germany, the minimum passage width is 500 mm.