SMA SC 500CP-10-JP Installation Manual - Manual (Page 54)

11 AC Connection SMA Solar Technology AG
54 SCCP-JP-IA-A4-en-12 Installation Manual
11 AC Connection
11.1 Safety during AC Connection
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Danger to life from electric shock due to live voltage
High voltages are present in the live components of the low-voltage and medium-voltage grids. 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 locally applicable safety regulations for working on the low-voltage and medium-voltage grids.
• Provided live voltage is not absolutely necessary, always disconnect the following components from voltage
sources before performing any work on the inverter:
– Grid 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.
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Risk of fire due to failure to observe torque specifications on live bolted connections
Failure to follow the specified torques reduces the ampacity of live bolted connections so that the contact resistances
increase. This can cause components to overheat and catch fire.
• Ensure that live bolted connections are always tightened with the exact torque specified in this document.
– Observe a torque of 37 Nm for connections with tin-plated aluminum terminal lugs on copper bar.
– Observe a torque of 60 Nm for connections with tin-plated copper terminal lugs on copper bar.
• When working on the device, use suitable tools only.
• Avoid repeated tightening of live bolted connections as this may result in inadmissibly high torques.