Mitsubishi Electric FR-A800 Series User Manual (English)

Other manuals for Mitsubishi Electric FR-A800 Series

Questions and Answers:

D
dmooreAug 18, 2025
Why does my Mitsubishi Electric Air Conditioner Accessory motor not run at the correct speed?
- C
  Cameron KnightAug 18, 2025
  The motor speed might be incorrect due to several reasons: * The speed command from the controller might be incorrect or affected by noise. Ensure the speed command is correct and implement EMC measures. * There might be a difference between the command speed and the speed recognized by the inverter. Readjust the bias and gain Pr.125, Pr.126, C2 to C7, C12 to C15 of the speed command. * The setting for the number of encoder pulses could be incorrect. Check the settings of Pr.369 (Pr.851) under Vector control. * The motor constant might vary due to an increase in motor temperature. Enable online auto tuning at startup (set Pr.95 (Pr.574) = "1") under Real sensorless vector control. For a lift, use of the Start-time tuning start external input (X28) signal is recommended.
M
Mr. Michael LewisAug 25, 2025
Why does speed greatly differ from the setting on Mitsubishi Electric FR-A800?
- P
  pgouldAug 26, 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.
D
Diana GibsonAug 27, 2025
Why is Mitsubishi Electric FR-A800 DC Drives motor rotating in opposite direction?
- K
  Katrina ButlerAug 27, 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.
P
phillipsrachelAug 30, 2025
Why does speed vary during operation with Mitsubishi Electric DC Drives?
- Z
  Zachary PonceAug 30, 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.
J
John KingSep 1, 2025
How to smooth acceleration/deceleration on Mitsubishi Electric DC Drives?
- R
  Roberto WilsonSep 1, 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.
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gregory10Sep 4, 2025
What to do if operation mode is not changed properly in Mitsubishi Electric FR-A800?
- C
  cheyennerhodesSep 4, 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.
R
Rodney BuchananSep 5, 2025
Why is motor current large in Mitsubishi Electric FR-A800?
- M
  michael19Sep 6, 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.
R
Richard JensenSep 8, 2025
Why does speed not increase on Mitsubishi Electric DC Drives?
- E
  Erika ShawSep 8, 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.
M
martinsherrySep 10, 2025
What to do if operation panel display is not operating on Mitsubishi Electric FR-A800?
- E
  Emily MossSep 12, 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.
J
Jacob CareySep 12, 2025
Why parameter write cannot be performed on Mitsubishi Electric FR-A800?
- M
  Maria LewisSep 13, 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).

Mitsubishi Electric FR-A800 Series Specifications

General

Series	FR-A800
Category	DC Drives
Output Frequency	0.1 to 400 Hz
Power Range	0.4 kW to 1, 200 kW
Horsepower Range	0.5 HP to 1, 600 HP
Control Method	V/f control, Vector control
Overload Capacity	150% for 60 seconds, 200% for 3 seconds
Braking	Dynamic braking, regenerative braking
Communication	RS-485, Ethernet, CC-Link, Profibus, DeviceNet
Safety	STO (Safe Torque Off)
Protection	Overcurrent, overvoltage, undervoltage, overheating
Protection Class	IP20
Cooling Method	Air-cooled
Ambient Temperature	-10°C to 50°C
Storage Temperature	-20°C to 60°C
Humidity	5% to 95% RH (non-condensing)
Altitude	Up to 1, 000 m
Vibration	5.9 m/s²