Mitsubishi Electric FR-F840-00250 User Manual (English)

Other manuals for Mitsubishi Electric FR-F840-00250

Questions and Answers:

T
Teresa KnightAug 4, 2025
How to fix incorrect motor speed on Mitsubishi Electric FR-F840-00250 Inverter?
- K
  Kenneth DunlapAug 5, 2025
  If the motor does not run at the correct speed, and there's a difference between the command speed and the actual speed, it could be due to noise affecting the speed command. Check that the speed command sent from the controller is correct and take EMC measures. Additionally, you can try setting Pr. 72 "PWM frequency selection" lower or adjusting the bias and gain (Pr. 125, Pr. 126, C2 to C7, C12 to C15) of the speed command again.
L
lauren19Aug 8, 2025
What to do if Mitsubishi Electric FR-F840-00250 machine movement is unstable?
- B
  barbara55Aug 9, 2025
  If the machine movement is unstable, it could be due to a speed control gain that is not suitable for the machine. Adjust Pr. 820 and Pr. 821. Alternatively, the response might be slow because of the inverter's acceleration/deceleration time setting, so setting the optimum acceleration/deceleration time may help.
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Melinda ThomasAug 13, 2025
Why is my Mitsubishi Electric FR-F840-00250 Inverter motor vibrating?
- J
  jefferymezaAug 13, 2025
  If the motor or machine experiences hunting (vibration or acoustic noise), it may be due to a speed control gain that is too high. Try setting Pr. 820 “Speed control P gain 1” lower and Pr. 821 “Speed control integral time 1” higher. Another possible cause is a torque control gain that is too high; in this case, set Pr. 824 “Torque control P gain 1 (current loop proportional gain)” lower. Also, check the motor wiring to ensure it is correct.
J
Jennifer PetersonAug 17, 2025
Why Mitsubishi Electric FR-F840-00250 speed does not accelerate?
- K
  Kristen ReidAug 17, 2025
  If the speed does not accelerate to the command speed, it could be due to torque shortage, causing the stall prevention operation level to activate. Try raising the stall prevention operation level. You could also increase the capacity or select PI control.
W
Wendy SchmidtAug 22, 2025
Why does Mitsubishi Electric FR-F840-00250 Inverter motor speed fluctuate?
- T
  Thomas JensenAug 22, 2025
  If the motor speed fluctuates, it could be because the speed command varies. Check that the speed command sent from the controller is correct and take EMC measures. You might also try setting Pr. 72 "PWM frequency selection" lower or setting Pr. 822 "Speed setting filter 1" higher. Another possibility is torque shortage, so raise the stall prevention operation level. Finally, the speed control gain might not be suitable for the machine, causing resonance, so adjust Pr. 820 "Speed control P gain 1" and Pr. 821 "Speed control integral time 1".
H
harry41Aug 26, 2025
What causes rotation ripple in Mitsubishi Electric Inverter?
- J
  Jason CardenasAug 26, 2025
  If rotation ripple occurs during low-speed operation, it could be that a high carrier frequency is affecting the motor rotation. Try setting Pr. 72 "PWM frequency selection" lower. Another cause could be that the speed control gain is too low, in which case you should set Pr. 820 "Speed control P gain 1" higher.
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John WelchAug 30, 2025
Why Mitsubishi Electric FR-F840-00250 motor does not run at the correct speed?
- S
  Sarah RobinsonAug 30, 2025
  The motor might not run at the correct speed because the speed command from the controller differs from the actual speed, potentially due to noise. To resolve this: * Verify that the speed command sent from the controller is correct, taking electromagnetic compatibility (EMC) measures if needed. * Try setting Pr.72 PWM frequency selection lower. Another cause could be a difference between the command speed and the speed recognized by the inverter. In this case, readjust the bias and gain of the speed command using Pr.125, Pr.126, C2 to C7, and C12 to C15.

Mitsubishi Electric FR-F840-00250 Specifications

General

Model	FR-F840-00250
Category	Inverter
Manufacturer	Mitsubishi Electric
Series	FR-F800
Input Phase	3-phase
Rated Output Current	52 A
Frequency Range	50/60Hz
Cooling Method	Forced air cooling
Enclosure Rating	IP20
Protection Structure	IP20
Operating Temperature	-10 to +50°C
Storage Temperature	-20 to +65°C
Weight	4.0 kg
Control Method	V/F control, Vector control
Protection Features	Overcurrent, Overvoltage, Undervoltage, Ground fault, Stall prevention
Communication Interface	RS-485
Ambient Humidity	5-95% RH (non-condensing)
Vibration Resistance	5.9 m/s2