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FR-CS80 - PU + EXT control and Term.4 Analog Input

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FR-CS80 - PU + EXT control and Term.4 Analog Input

Objective:
Configure a VSD to allow for PU and EXT Analog Speed reference control.

Step-by-Step Procedure for Configuring FR-CS80 VSD for PU and EXT Analog Speed Reference Control

Prerequisites

  • Hardware :

    • Mitsubishi FR-CS80 VSD (e.g., FR-CS80-025-60 for a 0.75 kW motor).
    • Potentiometer (10 kΩ recommended for 0–10 V control) or analog signal source (e.g., 4–20 mA from a PLC).
    • Wiring tools, shielded cables for analog signals, and terminal connectors.
    • PC with FR Configurator2 software (optional, for parameter backup or monitoring).

  • Documentation :

    • FR-CS80 Instruction Manual (IB(NA)-0600639ENG). (or better yet… the latest updated eManual Viewer)
    • Motor nameplate data (voltage, current, frequency).

  • Safety :

    • Ensure the VSD and motor are powered off during wiring.
    • Verify proper grounding of the VSD and motor to prevent electrical hazards.

Step-by-Step Procedure

Step 1: Wiring the FR-CS80 VSD

  1. Power Off and Verify :
  • Disconnect power to the VSD and motor.
  • Wait 5 minutes for the VSD’s internal capacitors to discharge (check the charge indicator LED is off).
  1. Connect the Motor :
  • Wire the motor to the VSD’s output terminals (U, V, W) using appropriately sized cables based on motor current.
  • Ensure correct phase sequence (U→U, V→V, W→W) to avoid reverse rotation.
  • Connect the motor’s ground wire to the VSD’s ground terminal (PE).
  1. Connect Power Supply :
  • Wire the three-phase power supply (e.g., 200–240 V for FR-CS80-025-60) to the VSD’s input terminals (R/L1, S/L2, T/L3).
  • Connect the ground wire to the PE terminal.
  1. Wire the Potentiometer for EXT Analog Speed Reference :
  • Use a 10 kΩ potentiometer for 0–10 V control (recommended for simplicity).
  • Connect the potentiometer’s three terminals to the VSD’s control terminals:
    • Positive (+) : Connect one outer terminal to terminal 10 (provides +5 V or +10 V, depending on Pr. 73 setting).
    • Wiper (center) : Connect to terminal 2 (analog voltage input, 0–10 V).
    • Negative (−) : Connect the other outer terminal to terminal 5 (common/ground for analog signals).
    • Use shielded cable to reduce noise, and connect the shield’s drain wire to ground at the VSD end only to avoid ground loops.
  • Alternative (4–20 mA) : If using a 4–20 mA signal, connect the current source to terminal 4 (current input) and terminal 5 (common). Set Pr. 73 accordingly (see Step 3).

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  1. Wire Control Inputs for PU/EXT Switching :
  • Connect a toggle switch or push-button between terminals STF (forward start) and PC (24 V common) for start/stop control in EXT mode.
  • Optionally, connect a switch between terminal MRS (output stop) and PC to enable/disable the VSD output.
  • For PU/EXT mode switching, no additional wiring is needed as this is controlled via the operation panel or parameters.
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Step 2: Configure PU and EXT Analog Speed Reference Control

Set Operation Mode for PU/EXT Combined Operation :

  • Navigate to Pr. 79 (Operation Mode Selection) .
  • Set Pr. 79 = 3 (PU and External combined operation mode). In this mode:
    • The PU (keypad) controls the frequency reference in PU mode.
    • In EXT mode, the frequency reference comes from the external analog input (e.g., terminal 2 or 4) when the AU terminal is active.
    • Start/stop commands in EXT mode are controlled by external signals (e.g., STF-PC).
    • Switching between PU and EXT modes is done using the [PU/EXT] key on the operation panel.

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Assign AU Terminal Function :

  • Navigate to Pr. 179 (RL Terminal Function Selection) .
  • Set Pr. 179 = 4 to assign the AU (analog input selection) function to the RL terminal (used as the AU terminal).
  • When the AU-PC circuit is closed (e.g., via a switch), the VSD uses the analog input (terminal 2 or 4) as the speed reference in EXT mode. When open, the speed reference may default to another source (e.g., PU setting, depending on Pr. 339).

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Configure Analog Input for EXT Mode :

  • Navigate to Pr. 73 (Analog Input Selection) .
  • For a 0–10 V potentiometer, set Pr. 73 = 1 (terminal 2, 0–10 V input).
  • For a 4–20 mA signal, set Pr. 73 = 5 (terminal 4, 4–20 mA input).
  • Ensure Pr. 73 enables the correct voltage/current input when the AU terminal is active (e.g., Pr. 73 = 5 for 4–20 mA with AU).

Reference Resources:


and Emanual Viewer (Recommended)