Connecting PE Cables

Precautions

• Ensure that the PE cable is securely connected. Otherwise, electric shocks may occur.
• Do not connect the neutral wire to the enclosure as a PE cable. Otherwise, electric shocks may occur.

• The PE point at the AC output port is used only as a PE equipotential point, and cannot substitute for the PE point on the enclosure.
• It is recommended that silica gel or paint be used around the ground terminal after the PE cable is connected.

Additional Information

The SUN2000 provides the grounding detection function. This function is used to check whether the SUN2000 is properly grounded before the SUN2000 starts, or check whether the ground cable is disconnected when the SUN2000 is running. This function is only available under limited conditions. To ensure the safe operation of the SUN2000, properly ground the SUN2000 according to the connection requirements of the ground cable. For some power grid types, if the output side of the SUN2000 is connected to an isolation transformer, ensure that the SUN2000 is properly grounded and set Grounding inspection to Disable to enable the SUN2000 to run properly. If you are not sure whether the SUN2000 is connected to such a type of power grid, contact your dealer or Huawei technical support for confirmation.

• According to IEC 62109, to ensure the safe operation of the SUN2000 in the case of ground cable damage or disconnection, properly connect the ground cable of the SUN2000 and ensure that it meets at least one of the following requirements before the grounding detection function becomes invalid:
  • If the PE terminal is not connected to the AC connector, use a single-core outdoor copper cable with a conductor cross-sectional area of at least 10 mm² as the PE cable on the chassis.
  • Use cables with the same diameter as the AC output power cable and ground the PE terminal on the AC connector and the ground screws on the chassis.
• In some countries and regions, the SUN2000 must have additional ground cables. Use cables with the same diameter as the AC output power cable and ground the PE terminal on the AC connector and the ground screws on the chassis.

Procedure

1. Crimp an OT terminal.
   • Avoid scratching the core wire when stripping a cable.
   • The cavity formed after the conductor crimp strip of the OT terminal is crimped must wrap the core wires completely. The core wires must contact the OT terminal closely.
   • Wrap the wire crimping area with heat shrink tubing or insulation tape. The heat shrink tubing is used as an example.
   • When using a heat gun, protect the equipment from being scorched.
   Figure 5-2 Crimping an OT terminal
   

   (A) Core wire	(B) Insulation layer	(C) Heat shrink tubing
   (D) Hydraulic pliers	(E) Heat gun

2. Connect the PE cable.
   • Ensure that the PE cable is connected securely.
   • You are advised to use the right ground point and reserve the other ground point for future use.
   Figure 5-3 Connecting a PE cable