SMA SC 500HE-US Maintenance Manual - Manual (Page 12)

2 Safety SMA America, LLC
12 SC500HEUS-eng-WH-IUS120411 Maintenance Manual
Electrical Hazards
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Electric shock from live voltage
High voltages are present in the inverter and its component parts. Some maintenance work must be
done with voltage present. Failure to adhere to the safety messages may lead to severe or lethal
injuries due to electric shock.
• Wear class 2 personal protective equipment.
• Always perform work in compliance with the regulations specified in 29 CFR, Chapter XVII,
Part 1910 (OSHA), NEC, and NFPA 70E.
• Do not touch any live component parts of the inverter or the medium voltage grid.
• Follow instructions precisely.
• Observe safety messages.
• Before performing any work on the inverter, always disconnect the inverter if voltage does not
absolutely need to be present.
• After disconnecting the inverter, wait at least 10 minutes until the inverter's capacitors have
discharged completely.
• Before performing work on the inverter, ensure that no voltage is present.
Electric shock caused by ground fault
In a ground fault, plant sections that are supposedly grounded may in fact be live. Failure to adhere
to the safety messages may lead to severe or lethal injuries due to electric shock.
• Ensure that no voltage is present before touching.
• Wear personal protective equipment.
Electric shock due to damaged inverter
Operating a damaged inverter can lead to hazardous situations that may result in serious or lethal
injuries due to electric shock.
• Operate the inverter only if it is in safe and technically faultless working order.
• Operate the inverter only if there is no visible damage.
• Regularly check for visible damage.
• Make sure that all external safety equipment is freely accessible at all times.
• Make sure that all safety equipment is in good working order.