SMA SC 500CP-US - Manual (Page 59)

SMA America, LLC 10 DC Connection
Installation Manual SCCP-US-IA-US_en-41 59
10 DC Connection
This section describes how the inverter is connected to the PV array and which safety measures must be taken in order to
avoid personal injury and property damage. It contains information on the cable requirements and the torque for correctly
connecting the cable.
10.1 Safety Precautions for the DC Connection
In this section, you will find safety precautions which you must observe throughout the entire process of making the DC
connection. Read this section carefully and follow the instructions to prevent personal injury and property damage and
to ensure smooth operation of the inverter.
The DC inputs are isolated from the enclosure and the system grounding. If required by section 250 of the National
Electrical Code ®
, ANSI/NFPA 70, the installer is responsible for this grounding.
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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 Hazard Risk Category 2 personal protective equipment.
• 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:
– Power 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 inverter 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 safeguard 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.