Mitsubishi Electric FR-A840-06830 (280K) User Manual

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INVERTER

INVERTER FR-A800 INSTRUCTION MANUAL (DETAILED)

J

HEAD OFFICE: TOKYO BUILDING 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

IB(NA)-0600503ENG-J(1705)MEE Printed in Japan Specifications subject to change without notice.

FR-A800

INSTRUCTION MANUAL (DETAILED)

FR-A820-00046(0.4K) to 04750(90K)(-GF)

FR-A840-00023(0.4K) to 06830(280K)(-GF)

FR-A842-07700(315K) to 12120(500K)(-GF)

FR-A846-00023(0.4K) to 03610(132K)

High functionality and high performance

MODEL

FR-A800

INSTRUCTION MANUAL

MODEL

CODE

XXX-XXX

Model

FR-A800

Instruction Manual (Detailed)

Model code 1A2-P52

Table of Contents

Questions and Answers:

D
Dr. Sharon GarciaAug 16, 2025
What to do if hunting occurs in Mitsubishi Electric Inverter motor?
- T
  Tracy HarrellAug 16, 2025
  If hunting (vibration or acoustic noise) occurs in the motor or machine connected to your Mitsubishi Electric Inverter, it might be due to a speed control gain that is too high. Try performing easy gain tuning or setting Pr.820 lower and Pr.821 higher. Alternatively, the torque control gain could be too high. In this case, set Pr.824 Torque control P gain 1 (current loop proportional gain) lower. Finally, incorrect motor wiring can also cause this issue, so ensure that the wiring is correct.
S
Samuel DickersonAug 23, 2025
What to do if Mitsubishi Electric FR-A840-06830 (280K) speed does not accelerate to the command speed?
- T
  Toni BrownAug 25, 2025
  If the speed of your Mitsubishi Electric Inverter does not accelerate to the command speed, it may be due to a torque shortage or the torque limit is operating. To resolve this, try raising the torque limit or increasing the capacity. Also, ensure that you are using PI control instead of only P (proportional) control.
S
Sandy WilliamsAug 27, 2025
Why does Mitsubishi Electric Inverter motor speed fluctuate?
- E
  Edwin GonzalezAug 27, 2025
  If the motor speed connected to your Mitsubishi Electric Inverter fluctuates, it could be due to several reasons. First, verify that the speed command sent from the controller is correct and implement EMC measures, and set Pr.72 lower. Another possible cause is a torque shortage, in which case you should raise the torque limit. If the speed control gain is not suitable for the machine, resulting in resonance, perform easy gain tuning.
D
Daniel RamirezAug 31, 2025
Why acceleration/deceleration time different from setting in Mitsubishi Electric Inverter?
- R
  Ryan MartinezAug 31, 2025
  If the acceleration or deceleration time of your Mitsubishi Electric Inverter is different from the setting, it could be due to a torque shortage, so try raising the torque limit. Alternatively, the load inertia might be too high, therefore set acceleration/deceleration time suitable for the load.
F
fitzgeraldjosephSep 4, 2025
Why is machine movement unstable with Mitsubishi Electric FR-A840-06830 (280K)?
- J
  Jennifer MarshallSep 4, 2025
  If the machine movement connected to your Mitsubishi Electric Inverter is unstable, it could be because the speed control gain is not suitable for the machine. Perform easy gain tuning to correct this. It could also be that the response is slow due to the inverter's acceleration/deceleration time setting, so set the optimum acceleration/deceleration time.
B
Benjamin SmithSep 7, 2025
How to fix rotation ripple during low-speed operation in Mitsubishi Electric FR-A840-06830 (280K) Inverter?
- M
  Michael FisherSep 7, 2025
  If rotation ripple occurs during the low-speed operation of your Mitsubishi Electric Inverter, it might be due to a high carrier frequency affecting the motor rotation. Try setting Pr.72 lower. Another possible cause is that the speed control gain is too low, so try setting Pr.820 higher.

Mitsubishi Electric FR-A840-06830 (280K) Specifications

General

Model	FR-A840-06830 (280K)
Series	FR-A840
Power Rating	280 kW
Output Capacity	280 kW
Protective Structure	IP20
Cooling Method	Forced air cooling
Control Method	Vector control
Frequency Range	0 - 400 Hz
Protection Features	Overcurrent, overload, overvoltage, undervoltage, phase loss
Operating Temperature	-10°C to +50°C
Storage Temperature	-20°C to +65°C
Humidity	95% RH or less (non-condensing)
Altitude	Up to 1000 m
Vibration	5.9 m/s²
Input Voltage	3-Phase 380 to 500 V AC

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