SMA SC 500CP-US - Manual (Page 87)

SMA America, LLC 14 Disconnecting the Inverter
Installation Manual SCCP-US-IA-US_en-41 87
Procedure:
1. Switch the key switch of the inverter to Stop.
2. If a DC Switch is present, switch the DC Switch in the door to OFF.
☑ The red light repeater lights up.
3. Secure the DC Switch in the door against accidental reconnection using a lockout device.
4. Wait 15 minutes until the inverter capacitors have discharged completely.
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Danger to life from electric shock due to live voltage
Despite disconnecting the integrated DC Switch, voltages are still present in the DC fuses and the inverter busbars.
Touching the DC fuses or the busbars will result in death or very serious injuries from electric shock.
• Disconnect the DC voltage in the main distribution or the sub-distribution.
• Wait 15 minutes until the inverter capacitors have discharged completely
Danger to life from electric shock even if the inverter is disconnected on the AC and DC sides
The precharge unit of the option "Q at Night" is also live if the AC contactor and the DC switch are open. Touching live
components of this assembly will result in death or serious injury.
• Do not touch live components.
• Do not remove protective covers.
• Observe the warning messages.
• Wear Hazard Risk Category 2 personal protective equipment..
Hazard Risk Category 2 protective equipment required
In accordance with NFPA 70E, an arc flash hazard risk analysis has been performed by SMA, and appropriate Arc
Flash Hazard labels stating the required Personal Protective Equipment (PPE) for exposed, energized interaction with
the equipment, are installed. Hazard Risk Category 2 PPE is the requirement for all routine maintenance, diagnostics,
and commissioning activities as described in the SMA protocols. Areas within the machine also exist that cannot,
under any circumstances, be exposed while energized. These areas are marked accordingly on the machine, and
can only be made accessible after de-energization of the inverter.
For additional information, please contact the SMA Service Line.
Disconnecting the AC Voltage of the Medium-Voltage Transformer
Only a duly authorized person trained in electrical safety is allowed to connect and disconnect the AC voltage of
the medium-voltage transformer.