10 DC Connection SMA Solar Technology AG
40 SCCPXT-IA-D7-en-42 Installation Manual
10 DC Connection
Depending on the order option, the DC connection procedure may differ. You must select the relevant section.
10.1 Safety during DC Connection
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 live DC cables
DC cables connected to PV modules that are exposed to sunlight carry live voltage. Touching live components results
in death or serious injury.
• Prior to connecting the DC cables, ensure that the DC cables are voltage-free.
• Wear suitable personal protective equipment for all work on the Sunny Central.
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 system
components that have not been properly grounded results in death or serious injuries from electric shock.
• Before working on the PV system, ensure that no ground fault is present.
• Wear suitable personal protective equipment for all work on the devices.
Danger to life from electric shock when entering the PV field
The insulation monitoring with GFDI, remote GFDI or soft grounding does not provide protection from injury when GFDI
is activated. PV modules grounded by GFDI discharge voltage to ground. When entering the PV field, lethal electric
shocks may occur.
• Before entering the PV field, switch the PV array to insulated operation.
• Ensure that the insulation resistance of the PV field is greater than 1 k Ω .
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