Mitsubishi Electric FR-E800 Series

Questions and Answers

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Claudia PrestonAug 14, 2025
Why does hunting (vibration or acoustic noise) occur in the motor or the machine of my Mitsubishi Electric FR-E800 Inverter?
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  Joseph ReidAug 14, 2025
  Hunting in your Mitsubishi Electric Inverter's motor or machine can occur due to several reasons: * The speed control gain might be too high. Try setting Pr.820 lower and Pr.821 higher. * The torque control gain might be too high. Try setting Pr.824 Torque control P gain 1 (current loop proportional gain) lower. * The motor wiring might be incorrect. Verify the wiring.
S
stonemeganAug 17, 2025
What to do if motor speed fluctuates in Mitsubishi Electric FR-E800 Inverter?
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  Patrick BrownAug 17, 2025
  If the motor speed fluctuates with your Mitsubishi Electric Inverter, consider the following: * Check that the speed command sent from the controller is correct and take EMC measures. Also, try setting Pr.72 lower and Pr.822 Speed setting filter 1 higher. * Torque shortage can cause speed fluctuations. Raise the torque limit. * The speed control gain might not be suitable for the machine, potentially causing resonance. Adjust Pr.820 Speed control P gain 1 and Pr.821 Speed control integral time 1.
K
Kathryn PooleAug 21, 2025
Why Mitsubishi Electric FR-E800 motor does not run at the correct speed?
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  Carlos LeeAug 21, 2025
  If your Mitsubishi Electric Inverter motor isn't running at the correct speed, it could be due to: * The speed command from the controller differing from the actual speed, possibly affected by noise. Ensure the speed command is correct and implement EMC measures. You can also lower the setting of Pr.72 PWM frequency selection. * An incorrect setting for the number of encoder pulses. Verify the Pr.369 setting (under Vector control). * A difference between the command speed and the speed recognized by the inverter. Readjust the bias and gain (Pr.125, Pr.126, C2 (Pr.902) to C7 (Pr.905)) of the speed command. * Motor constant variations due to increased motor temperature. Enable online auto-tuning at startup by setting Pr.95 (Pr.574) = "1" (under Real sensorless vector control).
J
Jennifer LewisAug 25, 2025
Why doesn't the speed accelerate to the command speed in my Mitsubishi Electric FR-E800?
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  hernandezjeffreyAug 26, 2025
  If the speed of your Mitsubishi Electric Inverter does not accelerate to the command speed, it may be due to: * Torque shortage or the torque limit operating. Try raising the torque limit or increasing the capacity. * Only P (proportional) control being performed. Speed deviation occurs under P control when the load is heavy, so select PI control.
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Miss Kristi MeyerAug 28, 2025
What causes unstable machine movement with a Mitsubishi Electric Inverter?
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  Robert KiddAug 28, 2025
  Unstable machine movement with a Mitsubishi Electric Inverter can be caused by: * Speed control gain that is not suitable for the machine. Adjust Pr.820 and Pr.821. * Slow response due to the inverter's acceleration/deceleration time setting. Set the optimum acceleration/deceleration time.
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Michael WeaverSep 1, 2025
Why is the acceleration/deceleration time different from the setting on my Mitsubishi Electric FR-E800 Inverter?
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  Courtney FoxSep 1, 2025
  If the acceleration/deceleration time differs from the setting on your Mitsubishi Electric Inverter, it might be due to: * Torque shortage. Try raising the torque limit. * Load inertia being too high. Set acceleration/deceleration time suitable for the load.
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Kenneth HoldenSep 4, 2025
How to resolve rotation ripple during low-speed operation of Mitsubishi Electric FR-E800 Inverter?
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  Paul AnthonySep 5, 2025
  To resolve rotation ripple during low-speed operation of your Mitsubishi Electric Inverter: * A high carrier frequency may be affecting the motor rotation. Try setting Pr.72 lower. * The speed control gain might be too low. Set Pr.820 higher.

Summary

CHAPTER 1 Introduction

1.1 Inverter model

Check the rating plate on the side of the product to identify specification details like voltage class, phases, capacity, communication type, and origin.

1.2 Operation steps

CHAPTER 2 Basic Operation

2.1 Operation panel

Details the components of the operation panel for standard, Ethernet, and safety communication models, explaining key functions and indicators.

2.5 Basic operation procedure (PU operation)

2.6 Basic operation procedure (External operation)

2.8 I;O terminal function assignment

Details how to assign functions to external I/O terminals and communication terminals by setting parameters.

CHAPTER 3 Parameters

3.1 Parameter initial value groups

3.2 Parameter list (by parameter number)

Provides a comprehensive list of all parameters, organized by parameter number, with their settings, initial values, and refer pages.

CHAPTER 4 Control Method

4.1 Vector control and Real sensorless vector control

Explains vector control techniques for induction motors, including the equivalent circuit and current classification.

4.2 Changing the control method and mode

Guides on selecting control methods (V/F, Vector, Sensorless, PM) and modes (speed, torque) using parameter settings.

4.3 Selecting the Advanced magnetic flux vector control

4.4 Selecting the PM sensorless vector control

Explains the process of initializing parameters for PM sensorless vector control, including offline auto tuning.

CHAPTER 5 Speed Control

5.1 Setting procedure of Real sensorless vector control (speed control)

Provides a step-by-step guide for setting up Real sensorless vector control for speed control, including parameter configuration and auto tuning.

5.2 Setting procedure of Vector control (speed control)

Details the procedure for setting up Vector control for speed control, covering wiring, motor specifications, and auto tuning.

5.3 Setting procedure of PM sensorless vector control (speed control)

Explains how to set up PM sensorless vector control for speed control, including parameter configuration and auto tuning.

5.4 Setting the torque limit level

Guides on setting the torque limit level to prevent overspeeding and describes methods for selecting torque limit input.

5.5 Performing high-accuracy, fast-response control (gain adjustment for Real sensorless vector control, Vector control, and PM sensorless vector control)

Explains how to adjust gain parameters for Real sensorless vector, Vector, and PM sensorless vector controls to improve performance and reduce vibration.

5.6 Speed feed forward control, model adaptive speed control

5.8 Avoiding motor overrunning

CHAPTER 6 Torque Control

6.1 Torque control

Explains torque control under Real sensorless vector control or Vector control, covering output torque, motor speed, and overspeed prevention.

6.2 Setting procedure of Real sensorless vector control (torque control)

Provides a step-by-step guide for setting up Real sensorless vector control for torque control, including parameter configuration and auto tuning.

6.3 Setting procedure for Vector control (torque control)

Details the procedure for setting up Vector control for torque control, covering wiring, motor specifications, and auto tuning.

6.4 Torque command

Explains how to select the torque command source, including analog input, parameter settings, and communication methods.

6.5 Speed limit

Guides on setting the speed limit value to prevent overspeeding and describes how control methods switch when the speed limit is reached.

6.6 Torque control gain adjustment

6.7 Troubleshooting in torque control

CHAPTER 7 Adjustment during Real sensorless vector control, Vector control, PM sensorless vector control

7.1 Speed detection filter

7.3 Gain adjustment of current controllers for the d axis and the q axis

Details how to adjust the proportional gain and integral time of current controllers for the d and q axes to improve control performance.

CHAPTER 8 (E) Environment Setting Parameters

8.2 Reset selection; disconnected PU detection; PU stop selection

8.10 Parameter write selection

Details how to enable or disable parameter writing to prevent rewriting by misoperation.

8.11 Password

8.15 PWM carrier frequency and Soft-PWM control

8.16 Inverter parts life display

Details how to diagnose the deterioration of control circuit capacitor, main circuit capacitor, cooling fan, and inrush current limit circuit.

CHAPTER 9 (F) Settings for Acceleration;Deceleration

9.1 Setting the acceleration and deceleration time

Explains how to set motor acceleration/deceleration time using parameters, allowing for slower or faster adjustments.

9.2 Acceleration;deceleration pattern

9.4 Starting frequency and start-time hold function

9.6 Shortest acceleration;deceleration (automatic acceleration;deceleration)

Describes how to set parameters for shortest acceleration/deceleration, useful when motor constants are unknown or for machines needing quick response.

CHAPTER 10 (D) Operation Command and Frequency Command

10.1 Operation mode selection

Guides on selecting the inverter's operation mode (PU, External, Network, Combined) using parameters or communication.

10.2 Startup of the inverter in Network operation mode at power-ON

10.3 Start command source and frequency command source during communication operation

Details selecting command sources for operation and frequency via communication, external terminals, or the PU.

10.6 Operation by multi-speed setting

CHAPTER 11 (H) Protective Function Parameters

11.1 Motor overheat protection (electronic thermal O;L relay)

Details setting current parameters to protect the motor from overheating, considering low cooling capability during low-speed operation.

11.3 Earth (ground) fault detection at start

11.4 Inverter output fault detection enable;disable selection

11.6 I;O phase loss protection selection

11.7 Retry function

Explains the function that allows the inverter to reset itself and restart automatically after a fault indication.

11.8 Limiting the output frequency (maximum;minimum frequency)

Guides on setting upper and lower limits for the output frequency to prevent motor overspeeding or ensure minimum speed.

11.9 Avoiding machine resonance points (frequency jump)

11.10 Stall prevention operation

Explains the function that monitors output current and automatically adjusts output frequency to prevent inverter shutoff due to overcurrent or overvoltage.