Mitsubishi Electric FR-E840-0170E User Manual (English)

Questions and Answers:

M
mariastewartAug 13, 2025
Why does hunting (vibration or acoustic noise) occur in the motor or the machine of my Mitsubishi Electric FR-E840-0170E?
- N
  Nathan SmithAug 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.
A
Amy KellerAug 17, 2025
What to do if motor speed fluctuates in Mitsubishi Electric FR-E840-0170E Inverter?
- K
  Kimberly RogersAug 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.
C
Carla ThompsonAug 21, 2025
Why Mitsubishi Electric FR-E840-0170E Inverter motor does not run at the correct speed?
- P
  Paul GarciaAug 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).
P
Paul AliAug 25, 2025
Why doesn't the speed accelerate to the command speed in my Mitsubishi Electric Inverter?
- R
  ramireztraceyAug 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.
M
marcstoneAug 28, 2025
What causes unstable machine movement with a Mitsubishi Electric FR-E840-0170E Inverter?
- K
  Krystal LoweAug 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.
A
Angela BlairSep 1, 2025
Why is the acceleration/deceleration time different from the setting on my Mitsubishi Electric FR-E840-0170E Inverter?
- Y
  ybeanSep 2, 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.
T
thomas82Sep 5, 2025
How to resolve rotation ripple during low-speed operation of Mitsubishi Electric Inverter?
- J
  Joel CamachoSep 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.

Mitsubishi Electric FR-E840-0170E Specifications

General

Brand	Mitsubishi Electric
Model	FR-E840-0170E
Category	Inverter
Language	English

Summary

Chapter 1 Introduction

1.1 Inverter model

1.2 Operation steps

Provides a flowchart and explanation of the basic operation steps for installing, setting up, and operating the inverter.

Chapter 2 Basic Operation

2.1 Operation panel

Details the components of the standard and Ethernet/safety communication model operation panels, including indicators and keys.

2.5 Basic operation procedure (PU operation)

2.6 Basic operation procedure (External operation)

Chapter 3 Parameters

3.2 Parameter list (by parameter number)

Provides a comprehensive list of inverter parameters, including their function, setting range, and refer to page.

Chapter 4 Control Method

4.1 Vector control and Real sensorless vector control

Explains the fundamental equivalent circuit of an induction motor and the principles of Vector and Real sensorless vector control.

4.2 Changing the control method and mode

Details how to set the control method (V/F, Advanced magnetic flux vector, Real sensorless vector, Vector, PM sensorless vector) and control mode.

4.3 Selecting the Advanced magnetic flux vector control

4.4 Selecting the PM sensorless vector control

Chapter 5 Speed Control

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

Provides detailed steps for setting up Real sensorless vector control for speed control operations.

5.2 Setting procedure of Vector control (speed control)

Outlines the procedure for setting up Vector control for speed control, including wiring and parameter settings.

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

Explains the steps for setting up PM sensorless vector control for speed control, including motor parameter initialization.

5.4 Setting the torque limit level

Details how to limit the output torque to prevent overspeeding, covering parameter selection and analog input methods.

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

Guides on adjusting speed control gain for optimal performance, addressing vibration, noise, slow response, and overshoot.

5.6 Speed feed forward control, model adaptive speed control

5.7 Torque bias

5.8 Avoiding motor overrunning

Provides methods to avoid motor overrunning due to excessive load torque or incorrect encoder pulse settings.

5.9 Troubleshooting in the speed control

Offers solutions for common speed control issues like motor not rotating, incorrect speed, hunting, and acceleration/deceleration problems.

Chapter 6 Torque Control

6.1 Torque control

Explains torque control under Real sensorless vector control or Vector control, focusing on outputting commanded torque.

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

Provides detailed steps for setting up Real sensorless vector control for torque control operations.

6.3 Setting procedure for Vector control (torque control)

Details the procedure for setting up Vector control for torque control, including wiring and parameter configuration.

6.4 Torque command

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

6.5 Speed limit

Describes how to set the speed limit value to prevent motor overspeeding during torque control.

6.6 Torque control gain adjustment

Guides on adjusting torque control gain to improve performance and address issues like vibration or overcurrent.

6.7 Troubleshooting in torque control

Provides solutions for common issues encountered during torque control operation, such as incorrect operation or torque variation.

Chapter 9 (F) Settings for Acceleration/Deceleration

9.1 Setting the acceleration and deceleration time

Explains how to set motor acceleration/deceleration time and multiple acceleration/deceleration times using parameters.

9.2 Acceleration/deceleration pattern

9.4 Starting frequency and start-time hold function

9.6 Shortest acceleration/deceleration (automatic acceleration/deceleration)

Chapter 10 (D) Operation Command and Frequency Command

10.1 Operation mode selection

Explains how to select the inverter operation mode (PU, External, Network, Combined) using parameters or signals.

10.3 Start command source and frequency command source during communication operation

Explains how to select command sources for operation and frequency via communication, external terminals, or PU.

10.5 JOG operation

10.6 Operation by multi-speed setting

CHAPTER 11 (H) Protective Function Parameters

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

Explains how to set current for electronic thermal relay to protect the motor from overheating and match temperature characteristics.

11.6 I/O phase loss protection selection

11.7 Retry function

Explains how the inverter can reset itself and restart at protective function activation, with selectable retry generating faults.

11.8 Limiting the output frequency (maximum/minimum frequency)

Describes how to clamp the upper and lower limits of the output frequency to prevent motor overspeeding.

11.9 Avoiding machine resonance points (frequency jump)

11.10 Stall prevention operation

Describes how the inverter automatically changes output frequency to prevent shutoff due to overcurrent or overvoltage.

11.11 Load characteristics fault detection

Explains how to monitor load operating conditions and activate protective functions or output warnings when deviations occur.

11.12 Motor overspeeding detection

Details how Overspeed occurrence (E.OS) is activated when motor speed exceeds the detection level, preventing accidental speeding.

CHAPTER 12 (M) Item and Output Signal for Monitoring

12.2 Monitor item selection on operation panel or via communication

Describes how to select monitor items displayed on the operation panel or via communication.

12.3 Monitor display selection for terminals FM and AM

12.4 Adjustment of terminal FM and terminal AM

12.6 Output terminal function selection

12.7 Output frequency detection

12.8 Output current detection function

CHAPTER 13 (T) Multi-Function Input Terminal Parameters

13.1 Analog input selection

Describes how to select analog input terminal specifications and forward/reverse rotation by input signal polarity.

13.2 Analog input terminal (terminal 4) function assignment

13.3 Response level of analog input and noise elimination

13.4 Frequency setting voltage (current) bias and gain

Explains how to set magnitude (slope) of output frequency in relation to torque setting signal and adjust bias/gain.

13.5 Torque (magnetic flux) setting current (voltage) bias and gain

Describes how to set magnitude (slope) of torque in relation to torque setting signal and adjust bias/gain.

13.6 Input terminal function selection

Explains how to select or change input terminal functions and check terminal availability for each parameter.

13.7 Inverter output shutoff

Describes how to shut off the inverter output with the MRS signal and select the logic of the MRS signal.

13.8 Selecting the condition to activate the Second function selection (RT) signal

13.9 Start signal operation selection

Describes how to select the start signal (STF/STR) operation and stopping method (deceleration or coasting) at turn-OFF.

CHAPTER 14 (C) Motor Constant Parameters

14.1 Applied motor

Explains how to select the motor type and set parameters for optimal operation and electronic thermal O/L relay function.

14.2 Offline auto tuning

Guides on performing offline auto tuning to enable optimal operation, especially for PM motors and when using non-Mitsubishi motors.

14.3 Offline auto tuning for a PM motor (motor constant tuning)

Details the procedure for offline auto tuning specifically for PM motors to measure and set motor constants.

14.4 Online auto tuning

14.6 Signal loss detection of encoder signals

CHAPTER 15 (A) Application Parameters

15.1 Brake sequence function

15.2 Stop-on-contact control

15.4 PID control

Details how to perform process control (flow, air volume, pressure) using feedback systems and PID control.

15.6 Dancer control

15.7 Automatic restart after instantaneous power failure / flying start with an induction motor

15.8 Automatic restart after instantaneous power failure / flying start with a PM motor

15.9 Offline auto tuning for a frequency search

15.10 Power failure time deceleration-to-stop function

15.11 PLC function

CHAPTER 16 (G) Control Parameters

16.1 Manual torque boost

16.3 Load pattern selection

16.6 DC injection brake, zero speed control, servo lock, and magnetic flux decay output shutoff

Details how to adjust braking torque and timing, and select zero speed control, servo lock, and magnetic flux decay.

16.7 Stop selection

16.8 Regenerative brake selection

16.9 Regeneration avoidance function

16.11 Encoder feedback control

16.13 Speed smoothing control

CHAPTER 18 Appendix

18.4 Parameters (functions) and instruction codes under different control methods

Provides a comprehensive table showing parameter availability across different control methods (V/F, Vector, Sensorless, PM).

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Mitsubishi Electric FR-E840-0170E User Manual

Table of Contents

Questions and Answers:

Mitsubishi Electric FR-E840-0170E Specifications

Summary

Chapter 1 Introduction

1.1 Inverter model

1.2 Operation steps

Chapter 2 Basic Operation

2.1 Operation panel

2.5 Basic operation procedure (PU operation)

2.6 Basic operation procedure (External operation)

Chapter 3 Parameters

3.2 Parameter list (by parameter number)

Chapter 4 Control Method

4.1 Vector control and Real sensorless vector control

4.2 Changing the control method and mode

4.3 Selecting the Advanced magnetic flux vector control

4.4 Selecting the PM sensorless vector control

Chapter 5 Speed Control

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

5.2 Setting procedure of Vector control (speed control)

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

5.4 Setting the torque limit level

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

5.6 Speed feed forward control, model adaptive speed control

5.7 Torque bias

5.8 Avoiding motor overrunning

5.9 Troubleshooting in the speed control

Chapter 6 Torque Control

6.1 Torque control

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

6.3 Setting procedure for Vector control (torque control)

6.4 Torque command

6.5 Speed limit

6.6 Torque control gain adjustment

6.7 Troubleshooting in torque control

Chapter 9 (F) Settings for Acceleration/Deceleration

9.1 Setting the acceleration and deceleration time

9.2 Acceleration/deceleration pattern

9.4 Starting frequency and start-time hold function

9.6 Shortest acceleration/deceleration (automatic acceleration/deceleration)

Chapter 10 (D) Operation Command and Frequency Command

10.1 Operation mode selection

10.3 Start command source and frequency command source during communication operation

10.5 JOG operation

10.6 Operation by multi-speed setting

CHAPTER 11 (H) Protective Function Parameters

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

11.6 I/O phase loss protection selection

11.7 Retry function

11.8 Limiting the output frequency (maximum/minimum frequency)

11.9 Avoiding machine resonance points (frequency jump)

11.10 Stall prevention operation

11.11 Load characteristics fault detection

11.12 Motor overspeeding detection

CHAPTER 12 (M) Item and Output Signal for Monitoring

12.2 Monitor item selection on operation panel or via communication

12.3 Monitor display selection for terminals FM and AM

12.4 Adjustment of terminal FM and terminal AM

12.6 Output terminal function selection

12.7 Output frequency detection

12.8 Output current detection function

CHAPTER 13 (T) Multi-Function Input Terminal Parameters

13.1 Analog input selection

13.2 Analog input terminal (terminal 4) function assignment

13.3 Response level of analog input and noise elimination

13.4 Frequency setting voltage (current) bias and gain

13.5 Torque (magnetic flux) setting current (voltage) bias and gain

13.6 Input terminal function selection

13.7 Inverter output shutoff

13.8 Selecting the condition to activate the Second function selection (RT) signal

13.9 Start signal operation selection

CHAPTER 14 (C) Motor Constant Parameters

14.1 Applied motor

14.2 Offline auto tuning

14.3 Offline auto tuning for a PM motor (motor constant tuning)

14.4 Online auto tuning

14.6 Signal loss detection of encoder signals

CHAPTER 15 (A) Application Parameters