Disconnecting The Inverter - SMA SUNNY CENTRAL 500CP-US/CA Maintenance Manual

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6 Disconnecting the Inverter

Prior to performing any work on the inverter, disconnect it from any voltage sources as described in this section.
Danger to life from electric shock due to live voltage
High voltages are present in the live components of the inverter. Touching live components results in death or serious
injury due to electric shock.
• When working in a high contact-risk environment, wear 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 live components.
• Follow the instructions precisely.
• Observe all safety messages on the product and in the documentation.
• Observe all safety precautions of the module manufacturer.
• Before any work on the inverter is performed, always disconnect the following components from voltage sources
if live voltage is not absolutely necessary:
– Line voltage for grid feed-in
– Internal power supply
– DC voltage from the PV array
– Additional external voltages, e.g. control signals of a control room
• Ensure that no disconnected components can be reconnected.
• After disconnecting the inverter from voltage sources, wait at least 15 minutes for the capacitors of the
Sunny Central to discharge completely.
• Always check that no voltage is present in any of the components before working on the inverter.
• Ground and short-circuit the device.
• Cover or shield any adjacent live components.
Danger to life from electric shock due to live DC cables
DC cables connected to PV modules that are exposed to sunlight are live. Touching live components results in death or
serious injury.
• Wear Hazard Risk Category 2 personal protective equipment for all work on the inverter.
• Prior to connecting the DC cables, ensure that the DC cables are voltage-free.
Danger to life from electric shock due to ground fault
If a ground fault has occurred, parts of the plant that are supposedly grounded may in fact be live. Touching incorrectly
grounded components can result in death or very serious injuries from electric shock.
• Ensure that no voltage is present before touching any components of the PV plant.
• Wear Hazard Risk Category 2 personal protective equipment for all work on the inverter.
Danger to life from electric shock when entering the PV field
Ground-fault monitoring with GFDI and Advanced Remote GFDI does not provide protection from injury when GFDI is
activated. PV modules grounded by GFDI discharge voltage to ground. Entering the PV field can lead to lethal electric
shocks.
• Before entering the PV field, switch the PV array to insulated operation.
• Ensure that the insulation resistance of the PV array is greater than 1 k Ω .
Maintenance Manual
6 Disconnecting the Inverter
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