Disconnecting The Sunny Central - SMA SUNNY CENTRAL 500CP XT Installation Manual

SMA Solar Technology AG

14 Disconnecting the Sunny Central

Before working on the Sunny Central, always disconnect the Sunny Central from all 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 Sunny Central. 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.
• Do not touch any live components.
• Follow the instructions precisely.
• Observe all warning messages on the product and in the documentation.
• Observe all safety precautions of the module manufacturer.
• Provided live voltage is not absolutely necessary, always disconnect the following components from voltage
sources before performing any work on the inverter:
– Line voltage for grid feed-in
– Internal power supply
– DC voltage from the PV array
– Additional external voltages, e.g. control signals from a control room
• Ensure that no disconnected components can be reconnected.
• Wait 15 minutes after switching off the inverter before opening it. This will ensure that the capacitors are
discharged.
• Before working on the Sunny Central, check that all devices are completely voltage-free.
• Ground and short-circuit.
• Cover or isolate any adjacent live components.
Danger to life from electric shock due to ground fault
If a ground fault has occurred, parts of the PV system that are supposedly grounded may in fact be live. Touching
incorrectly grounded components results in death or serious injuries from electric shock.
• Ensure that no voltage is present before touching any components.
• Wear suitable personal protective equipment for all work on the Sunny Central.
Danger to life from electric shock when entering the PV field
The ground-fault monitoring with GFDI, remote GFDI or soft grounding does not provide protection from personal injury
when GFDI is activated. PV modules which are grounded with ground-fault monitoring discharge voltage to ground.
Entering the PV field can result in lethal electric shocks.
• 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 .
Connecting and disconnecting the AC voltage of the MV transformer
Only a duly authorized person trained in electrical safety is allowed to connect and disconnect the AC voltage of
the MV transformer.
Installation Manual
14 Disconnecting the Sunny Central
SCCPXT-IA-D7-en-42 65