SMA SC 4200 UP - Electric Shock Hazards (Part 2)

2 Safety
SMA Solar Technology AG
Service Manual for Installers 7SC-UP_SCS-UP_EZE-SG-en-10
DANGER
Danger to life due to electric shock in case of a ground fault
If there is a ground fault, components that are supposedly grounded may in fact be live and components that are
normally ungrounded may be grounded. The PV field is not grounded when the inverter is disconnected or during
the measurement of the insulation resistance. Touching live parts will result in death or serious injury due to electric
shock.
• Disconnect the inverter from the power path and from the control path if no voltage is required for working on
the product.
• Before working on the system, ensure that no ground fault is present.
• Wear suitable personal protective equipment of the corresponding hazard risk category for all work when the
power transmission path is connected. The hazard risk categories of the various areas of the product are
different.
WARNING
Danger to life from electric shock when the product is left unlocked
If the product is not locked, unauthorized persons will have access to components carrying lethal voltages. Touching
live components can result in death or serious injury due to electric shock.
• Always close and lock the product.
• Ensure that unauthorized persons do not have access to the closed electrical operating area.
WARNING
Danger to life from electric shock when entering the PV power plant
Lethal ground currents due to damaged insulations of the PV field. Lethal electric shocks can result.
• Ensure that the insulation resistance of the PV array exceeds the minimum value. The minimum value of the
insulation resistance is: 14kΩ.
• Before entering the PV field, switch the PV power plants with ground fault monitoring to insulated operation.
• After entering the PV power plant, immediately ensure that the inverter does not display an insulation error.
• Disconnect the inverter from the power path and from the control path if no voltage is required for working on
the product.
• Wear suitable personal protective equipment for all work on the product.
• Configure the PV power plant as a closed electrical operating area.
WARNING
Danger to life from electric shock when entering the PV power plant outside of the feed-in
operation
With the order option "Backfeed Power", DC voltage can be applied to the inverter outside of the feed-in operation.
Lethal electric shocks can result.
• Before entering the PV power plant, make sure via the user interface that the inverter is not in backfeed power
mode.
• Always disconnect the inverter from the power transmission path and from the control path if no voltage is
required for working on the PV power plant.
• Wear suitable personal protective equipment for all work on the product.
• Configure the PV power plant as a closed electrical operating area.