Precision Zone Expertly Repairs Inverter-General Purpose Mitsubishi FR-A82x-xxxxx-x-xx (200V)

Here at Precision Zone, one of our specialties is the repair services of Mitsubishi inverter drive units. One series that we often work on is the Freqrol-A800 series which covers the 200V option (FR-A820) and the 400V option (FR-A840).

The FR-A800 series has quite a bit of information that can be gathered from the model number. An in-depth description of this can be found here. Between the SLD (super low duty) and the ND (normal duty) options, the rated output ranges from 2.3A to 683A for SLD and ranges from 0.4kW up to 280kW for the ND option.

The parameter unit available for this series, model FR-DU08, mounts easily to the front panel of these units. This operator panel allows a few different operations such as standard operation mode, monitoring mode, parameter setting, function mode, and a fault history mode. Faults will be displayed once they occur, but if power is cycled or the fault is cleared, it can be checked in the fault history mode of the operator’s panel.

When assessing the functionality of a drive, our repair team typically conducts a four-step check:

    1. Visual Overview
    2. Static Test
    3. Checks Under Power
    4. Alarm Codes Verification

This overview is Precision Zone’s basic troubleshooting process. Once our repair team starts on the job, we use specialized and customized testing fixtures, Huntron trackers, signal generators, oscilloscopes, milli and megaohm meters, as well as any other necessary tools we have available to assure quality repair work. Most importantly, every repair is fully tested in our custom-built simulators under load with a motor to replicate real-life working environment.

Precision Zone goes as far as using heating chambers and overnight dynamic testing, when applicable, to guarantee performance of the repaired product when it arrives back with the customer.

Mitsubishi General-Purpose Inverter FR-A800 Series – Static Checking Process

Visual Overview

When conducting a visual check, the technician inspects the drive for any mechanical damage to the drive itself and any printed circuit boards (PCB). The technician then proceeds to verify connections are tight and correct inside the drive and there are no loose screws, wires or debris. Additionally, the unit is checked for any burn marks on the components, PCBs or chassis. During the visual inspection, excessive dirt on cooling components is noted as well as the functionality of the heat sink.

Basic Static Check

Input Module Testing

The input modules on these units can be tested by use of a digital multimeter with diode checking capabilities. Upon removing the cover, all of these terminals can be located along the terminal strip found within the unit.

Positive Lead Negative Lead Reading
R/L1 'P/+' Terminal 0.41V-0.54V
S/L2 'P/+' Terminal 0.41V-0.54V
T/L3 'P/+' Terminal 0.41V-0.54V
'N/-' Terminal R/L1 0.41V-0.54V
'N/-' Terminal S/L2 0.41V-0.54V
'N/-' Terminal T/L3 0.41V-0.54V

Output Module Testing

Using the same type of test as above, the output modules can be checked as well. These readings will vary slightly with drive capacity, but each reading should be within 10% of one another. Our technicians are also equipped with huntron devices further verify their integrity.

Positive Lead Negative Lead Reading
U 'P/+' Terminal 0.37V-0.54V
V 'P/+' Terminal 0.37V-0.54V
W 'P/+' Terminal 0.37V-0.54V
'N/-' Terminal U 0.37V-0.54V
'N/-' Terminal V 0.37V-0.54V
'N/-' Terminal W 0.37V-0.54V

Mitsubishi General-Purpose Inverter FR-A800 Series - Common Alarms and Warnings

Alarm Code Description Checks
Overcurrent detected during acceleration (OC1), constant speed (OC2), or deceleration (OC3)
  • Check cables for poor insulation
  • Perform magaohm test on motor
  • Use 'Output Module Testing' test to verify modules
  • Check for ground faults
ERR Operation setting error, reset signal stuck ‘ON’, proper communication is not possible
  • Verify operation method
  • Verify proper wiring
  • Check input voltage
  • Swap drive out with another if applicable
FN The cooling fan within the inverter is not functioning properly
  • Check for debris lodged within fan fins
  • Verify wiring
  • Replace fan
E.GF Ground fault has occured on the output of unit
  • Check motor or wire for ground fault
  • Check input/output terminals to ground for leakage
  • Replace Drive

For a full list of Mistubishi FR-A800 Series alarms, click below for a list directly from the manual:

This list of checks for certain alarms is primarily a good starting point and if any further troubleshooting or technical support is needed feel free to contact us via phone or email to get in touch with our experienced tech support team.

Learn the benefit of repairing your Mitsubishi FR-A800 General Purpose Inverters with Precision Zone

  • Quick and Flexible Service
  • Fully Refurbished, not just repaired
  • Decades of Industry Experience/li>
  • Superior Technology Knowledge and Support

Contact Us To Start Your Repair Today!

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