SMA SC 500HE-20 Installation - Manual (Page 10)

2 Security SMA Solar Technology AG
10 SCxxxHE-20-IA-IEN111210 Installation Manual
2.2 Safety Instructions
Electrical Risk
Risk of electric shock when touching conductive parts
High voltages that can cause electrical shocks are present in the inverter. Work on the inverter is only
allowed if the power is disconnected and in compliance with the guidelines that apply at the
installation location.
• Disconnect the following components:
– Grid voltage for grid feeding
– Internal supply
– DC voltage from the PV array
– Additional external voltages (e.g., control signals of a control room)
• Ensure that the device cannot be reconnected.
• Ensure that no voltage is present.
• Ground and short-circuit.
• Cover or safeguard any adjacent live components.
Electric shock through capacitors not fully discharged
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.
Electric shock caused by damage on the inverter
The operation of a damaged inverter can lead to serious or lethal injuries through electric shock.
• Operate the inverter only in technically proper and operationally safe status.
• Check the inverter regularly for visible damage.
• Ensure that all safety features are freely accessible at all times.
• Regularly check for correct functioning.
Electric shock caused by ground fault
In case of a ground fault, assume that grounded plant components are still live.
• Ensure that no voltage is present before touching.
Electric shock when entering the PV field
The insulation monitoring device with GFDI or Remote GFDI does not provide protection from injury
when GFDI is activated. PV modules grounded by means of GFDI disperse voltage to ground.
When entering the PV field, lethal electric shocks may occur.
• 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 .