Our Team Expertly Repairs Fuji FVRxxxE9S General Purpose Inverter Drives

Here at Precision Zone, one of our specialties is the repair services of general purpose inverter units. One series that we often work on is the FVRxxxE9S series made by Fuji.

This series is used in a wide range of applications and has rated sizes that start at 0.1kW and work up to 4.0kW. To go along with the range of ratings, there are also options for three-phase 200V, three-phase 400V, and even single-phase 200V, allowing for a variety of applications to correctly utilize this inverter unit. The standard version of this unit comes with a keypad panel mounted on the top, though there are variations that do not offer the keypad. The model for this type will look similar to the following, FVRxxxE9S-#S, where the trailing S determines that no keypad is currently part of the unit.

The keypad available for these drive units allows for easy parameter checking and setting, error code displays, and the ability to monitor current running conditions and readings. Programming can be done while stopped and also while running, though if it is done while running certain parameters (functions) cannot be altered. A full list of parameters can be found here and the descriptions go through which are available to alter while running or while stopped.

When assessing the functionality of a Fuji General Purpose Inverter like this one, our expert repair team of engineers and technicians 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.

Repair Process for Fuji FVRxxxE9S General Purpose Inverter Drives

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, apart from a negative bus terminal, can be located along the terminal strip found within the unit.

Positive Lead Negative Lead Reading
R 'P' Terminal 0.42V-0.51V
S 'P' Terminal 0.42V-0.51V
T 'P' Terminal 0.42V-0.51V

Output Module Testing

Using the same type of test as above, the output modules can be checked as well. Our technicians are also equipped with huntron devices further verify their integrity.

Positive Lead Negative Lead Reading
U 'P' Terminal 0.38V-0.50V
V 'P' Terminal 0.38V-0.50V
W 'P' Terminal 0.38V-0.50V

Common Alarms for the Fuji FVRxxxE9S Series

Alarm Code Description Checks
Overcurrent detected during acceleration (OC1), deceleration (OC2), or constant speed (OC3)
  • Check cables for poor insulation
  • Perform magaohm test on motor
  • Use 'Output Module Testing' test to verify modules
  • Check for ground faults
ER# Memory error, communication error, CPU error, option board error, wiring error. # following Er will determine specific fault (see link)
  • Check applicable troubleshooting based on the exact Er # code
LU Under voltage has been detected for at least 15 msec.
  • Verify incoming power voltage (phase to phase & phase to ground)
  • Check if any excess load is applied to the motor
  • Attempt to power cycle
Overvoltage has been detected during acceleration (OU1), deceleration (OU2), or steady speed (OU3)
  • Verify incoming power voltage (phase to phase & phase to ground)
  • If during deceleration, verify braking resistor/unit if used
  • Attempt to increase accel/decel times

For a full list of Fuji FVRxxxE9S alarms 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 Fuji 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!

Recently Repaired Products

Fuji FVR1.5E9S-2KKC image FVR1.5E9S-2KKC is an
Inverter-General Purpose manufactured by Fuji
Discovered issues: No Display
Product Type: AC Inverter
Standard applied motors: 1.5kW
Developed inverter series: E9S Series
Input power source: 200V; 3 Phase
Variation: KKC

Fuji FVR2.2E9S-2 image FVR2.2E9S-2 is an
Inverter-General Purpose manufactured by Fuji
Discovered issues: Bad Digital Operator
Product Type: AC Inverter
Standard applied motors: 2.2kW
Developed inverter series: E9S Series
Input power source: 200V; 3 Phase
Variation: standard