Using conveyor with big electrical box

💡 How-to
1

This guide explains how to set up the conveyor belt.

Step 1: Power Supply Connection

  1. Start by connecting the 230V AC supply (from a wall socket) to a main switch.

  2. The main switch will split the power into three lines:

  • Phase 1 (L)
  • (Phase 2(L))
  • (Phase 3(L))
  • Neutral (N)
  • Earth (PE – green/yellow)

Step 2: Safety and Distribution

  1. Connect the output of the main switch to a circuit breaker (without RCD/earth leakage).

  2. From the circuit breaker, lead the wires to a distribution block.

  3. Connect:

  • Phase 1 (L) and Neutral (N) from the distribution block to the input terminals of the frequency inverter (VFD).

  • The earth wire (green/yellow) goes to a separate earth distribution block and then to the earth terminal of the VFD.

Step 3: Connecting the Frequency Inverter (FR-D720S-025SC-EC)

  1. The three-phase motor is connected directly to the inverter’s output terminals (U, V, W) and the motor’s earth to the VFD’s PE terminal.

Step 4: Control Wiring

  1. Potentiometer connection (for speed control):
  • Terminal 10:
  • Terminal 2: Wiper (variable output from the potentiometer)
  • Terminal 5: Ground (GND)
  1. Emergency stop switch:
  • Connect the NO (normally open) contacts of the E-stop to terminals S1 and S2.
  • Terminal SC serves as the common return.
  1. Run/Stop and Direction control (via switches):
  • Terminal PC: Common (connected to one side of both switches)
  • Terminal STF: Forward run command (T1 on direction switch)
  • Terminal STR: Reverse run command (T4 on direction switch)

Important Notes:

  • there is a lot more going on inside the electrical box but that can be used for your own projects, it is not necessary to make the conveyor work. (relay, electrical socket, 230-24 power converter and Mitsubishi servo amplifier)

!!Working outside of the lab you must attach an earth leakage feature to the circuit braker. (Thijs orders)!!

Use safety rings and screws to attach the motor cap correctly (Thijs orders).

  • Always verify that control terminals are configured correctly in the VFD parameters (e.g., setting the input mode to use STF/STR).
  • Follow Mitsubishi’s official manual for correct parameter settings and safety precautions.
  • Ensure that all work is done by a qualified electrician and complies with local electrical codes. (ask Quinten from workshop or Thijs)

Electrical overview

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Inside conveyor control box
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