Mitsubishi Electric FR-A840 User Manual

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MITSUBISHI ELECTRI

C

MITSUBISHI ELECTRI

C

INDUSTRIAL AUTOMATION

Frequency Inverter

Beginner’s Guide

FR-A800

Art. no.: 280305

23 10 2014

Version A

Version check

Table of Contents

Questions and Answers:

E
Erica Lucas DVMAug 19, 2025
Why does speed greatly differ from the setting on Mitsubishi Electric FR-A840 DC Drives?
- A
  Angela LuceroAug 19, 2025
  If the speed of your Mitsubishi Electric DC Drive greatly differs from the setting, begin by verifying that the frequency setting signal is correct by measuring the input signal level. Next, check the settings of parameters 1, 2, and 19. Ensure that the input signal lines are not affected by external noise by using shielded cables. Lastly, confirm that the load is not excessively heavy.
G
gwendolynbrownAug 22, 2025
Why is Mitsubishi Electric DC Drives motor rotating in opposite direction?
- H
  handersonAug 22, 2025
  If your Mitsubishi Electric DC Drive's motor rotates in the opposite direction, check that the phase sequence of output terminals U, V, and W is correct. Also, ensure that the start signals (forward rotation, reverse rotation) are connected properly and that the frequency setting signal is correct by measuring the input signal level.
C
Christine SmithAug 25, 2025
Why does speed vary during operation with Mitsubishi Electric FR-A840 DC Drives?
- J
  Jean ThomasAug 25, 2025
  If the speed of your Mitsubishi Electric DC Drive varies during operation, verify that the load is not varying and that the frequency setting signal is stable. Ensure the frequency setting signal is not affected by noise. Check for any malfunction caused by undesirable currents when the transistor output unit is connected, and make sure the wiring length is not excessively long.
K
Kayla MiddletonAug 27, 2025
How to smooth acceleration/deceleration on Mitsubishi Electric FR-A840?
- J
  Jessica StevensAug 27, 2025
  If the acceleration or deceleration of your Mitsubishi Electric DC Drive is not smooth, start by checking that the acceleration and deceleration time settings (Pr. 7 and 8) are not too short; increase these values. Also, verify that the load is not too heavy and that the torque boost setting is not too large, which could activate the stall function.
H
Hannah WestAug 30, 2025
What to do if operation mode is not changed properly in Mitsubishi Electric FR-A840?
- T
  Tyler MartinezAug 30, 2025
  If the operation mode of your Mitsubishi Electric DC Drive is not changing properly, ensure that the STF or STR signal is OFF, as the operation mode cannot be changed when it is active. Also, check the Pr. 79 setting. If Pr. 79 is set to "0" (initial value), the inverter is in external operation mode at power-on; use the PU/EXT key to switch to the control unit mode.
M
Mary SosaSep 1, 2025
Why is motor current large in Mitsubishi Electric DC Drives?
- A
  austin79Sep 2, 2025
  If the motor current is large in your Mitsubishi Electric DC Drive, check that the load is not too heavy and ensure that the Pr. 0 “Torque boost” setting is appropriate.
L
Leslie CastilloSep 4, 2025
Why does speed not increase on Mitsubishi Electric DC Drives?
- T
  Tanner HicksSep 4, 2025
  If the speed of your Mitsubishi Electric DC Drive does not increase, check that the maximum frequency (Pr. 1) setting is correct. Also, ensure that the load is not too heavy and that the torque boost setting is not too large, as it could activate the stall function.
T
thompsonkelseySep 7, 2025
What to do if operation panel display is not operating on Mitsubishi Electric FR-A840 DC Drives?
- T
  Teresa WilliamsSep 7, 2025
  If the operation panel display of your Mitsubishi Electric DC Drive is not operating, ensure that the terminals PC and SD are not connected. Also, check that the jumper across P1 and P/+ is connected.
M
Melinda HortonSep 10, 2025
Why parameter write cannot be performed on Mitsubishi Electric FR-A840?
- J
  Jessica KingSep 10, 2025
  If you cannot perform a parameter write on your Mitsubishi Electric DC Drive, ensure that operation is not being performed (signal STF or STR is not ON). Press the SET key (parameter unit FR-DU08) to save the parameter settings. Check that the parameter settings are within the setting ranges and that you are not attempting to set the parameter in the external operation mode (Pr. 79, section 6.2.7).
N
newmankimberlySep 12, 2025
Why Mitsubishi Electric FR-A840 motor generates abnormal noise?
- L
  Luis BowmanSep 13, 2025
  If your Mitsubishi Electric DC Drive's motor generates abnormal noise, check that the deceleration time is not too short (Pr. 8).

Mitsubishi Electric FR-A840 Specifications

General

Brand	Mitsubishi Electric
Model	FR-A840
Category	DC Drives
Language	English

Summary

Safety guidelines

For use by qualified staff only

Proper use of the products

Relevant safety regulations

Safety warnings in this manual

Electric shock prevention

WARNING

Warnings about touching live parts, opening covers, and residual voltage.

Fire prevention

Injury prevention

Operation

WARNING

Warnings about retry function, emergency stop, and using specific motor types.

CAUTION

Emergency stop

CAUTION

Recommendations for safety backups and handling error messages.

Connections

3.1 Power supply, motor and earth connections

Details on connecting power supply, motor, and earth grounding for FR-A800/A846 and FR-A842.

3.2 Control terminals

Lists and explains key control terminals for inverter operation and configuration.

Start-up

4.1 Preparations

Checklist for correct wiring, earthing, and connections before initial power-on.

4.1.2 Important settings before switching on the motor for the first time

Essential parameter settings like frequency, V/f pattern, and acceleration/deceleration times.

Functional test

Operation and settings

5.1 Operating FR-A800 inverters

Overview of the FR-DU08 parameter unit, its components, and functions.

Operation mode selection

Setting the frequency and starting the motor

Editing parameter settings

Parameter

6.1 Simple mode parameters

Details basic parameters for configuring the inverter for specific applications.

6.2 The simple mode parameters in detail

Provides in-depth explanations of essential simple mode parameters.

The simple mode parameters in detail

6.2.1 Torque Boost (Pr. 0)

6.2.3 Base frequency (Pr. 3)

6.2.5 Acceleration and deceleration times (Pr. 7, Pr. 8)

6.2.7 Operation mode selection (Pr. 79)

Details how to set the inverter's operation mode (external, PU, network).

6.2.8 Setting input gain maximum frequency (terminals 2, 4) (Pr. 125, Pr. 126)

6.2.2 Minimum/maximum output frequency (Pr. 1, Pr. 2)

6.2.4 Multi-speed settings (Pr. 4 to Pr. 6)

6.2.6 Electronic thermal overload relay (Pr. 9)

6.2.10 PM parameter initialization (Pr. 998)

Protective and diagnostics functions

7.1 Troubleshooting

Guides users through diagnosing and resolving common operational issues and errors.

7.2 List of alarm displays

Lists and explains various alarm and error codes displayed by the inverter.

7.3 Resetting the inverter (Reset)

Describes methods for resetting the inverter after a fault or shutdown.

Appendix

A.1 Parameter list (FR-A800)

Comprehensive list of all parameters for the FR-A800 series inverters.

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