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Connecting an AC Output Power Cable
Prerequisites
- To ensure that the inverter can be safely disconnected from the power grid when an exception occurs, connect an AC switch to the AC side of the inverter. Select an appropriate AC switch in accordance with local industry standards and regulations.
- Connect the AC output power cable according to the requirements specified by local power grid operators.
- Connect the power cable of the tracking system before the AC output power cable. Otherwise, reworking will be caused.Figure 5-12 Cable connection sequence
(1) Power cable of the tracking system
(2) AC output power cable
- Do not connect loads between the inverter and the AC switch that directly connects to the inverter. Otherwise, the switch may trip by mistake.
- If an AC switch is used with specifications beyond local standards, regulations, or the Company's recommendations, the switch may fail to turn off in a timely manner in case of exceptions, causing serious faults.
Each inverter must be equipped with an AC output switch. Multiple inverters cannot connect to the same AC output switch.
Requirements for the OT/DT Terminal
- If a copper cable is used, use copper wiring terminals.
- If a copper-clad aluminum cable is used, use copper wiring terminals.
- If an aluminum alloy cable is used, use copper-aluminum transition wiring terminals, or aluminum wiring terminals along with copper-aluminum transition spacers.
- Do not connect aluminum wiring terminals to the AC terminal block. Otherwise the electrochemical corrosion will occur and affect the reliability of cable connections.
- Comply with the IEC61238-1 requirements when using copper-aluminum transition wiring terminals, or aluminum wiring terminals along with copper-aluminum transition spacers.
- If copper-aluminum transition spacers are used, pay attention to the front and rear sides. Ensure that the aluminum sides of spacers are in contact with aluminum wiring terminals, and copper sides of spacers are in contact with the AC terminal block.
Figure 5-13 Requirements for the OT/DT terminal
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Figure 5-14 AC terminal block dimensions of a 3-pin model
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Figure 5-15 AC terminal block dimensions of 4-pin models
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This section describes how to install an AC output power cable for the 3-pin model.
Procedure
- Prepare a cable.
- Remove rubber rings according to the cable diameter range.
- Secure the AC output power cable and PE cable.
- Install the support bar.
- Close the maintenance compartment door and tighten the two screws on the door.
- Sufficient slack should be provided in the PE cable to ensure that the last cable bearing the force is the PE cable when the AC output power cable bears pulling force due to force majeure.
- The cable outer diameter can be measured using the ruler sticker in the maintenance compartment.
- Ensure that the cable jacket is in the maintenance compartment.
- Ensure that the AC output power cable is secured. Failing to do so may cause the solar inverter to malfunction or damage to its terminal block by issues such as overheating.
- Before closing the maintenance compartment door, check that the cables are connected correctly and securely, and clean up the foreign matter from the maintenance compartment.
- If a screw on the maintenance compartment door is lost, obtain the spare screw from the fitting bag tied at the bottom of the maintenance compartment.
Figure 5-16 Multi-core cable connectionsFigure 5-17 Single-core cable connectionsThe 32–36 mm cable is supported only by some models. Refer to the corresponding label to get the supported size.
Figure 5-18 3-pin model (125KTL) cable connections(A) Four-core cable
(B) Three-core cable
(C) Single-core cable
Figure 5-19 4-pin model (75KTL/100KTL/110KTL) cable connections(A) Five-core cable
(B) Four-core cable (including the PE cable)
(C) Four-core cable (including the neutral wire)
(D) Three-core cable
(E) Single-core cable (including the neutral wire)
(F) Single-core cable (excluding the neutral wire)
The cable colors shown in figures are for reference only. Select an appropriate cable according to the local standards.
Figure 5-20 Closing the Maintenance Compartment Door
