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Okuma MIVxxx-1-Bx AC Servo Drive Repair Experts

Here at Precision Zone, one of our specialties is the repair services of Okuma MIV units. One series that we often work on is the MIVxxx-1-Bx series. The MIV unit is the inverter unit within Okuma’s motion control system (MCS).

The MIVxxx indicates the rating and capacity of the servo unit. This series of drives ranges from 1kW up to 45kW of power. The MIV unit can come with one or two axis capabilities. In this case, the two-axis ratings are listed sequentially. For example, an MIV that has the first and second axes rated for 45kW, the part number would be MIV4545-1-Bx (where the last ‘x’ indicates the control ROM type). These inverters are modular and can be easily replaced for troubleshooting or removed for repair. A connection to the MPS power supply and NC control is easily accessible on the face of the drive and the motor cables connect down at the bottom of the drive.

Alarms and warnings are displayed by dual seven segment displays on the face of the drive. When the drive is a 2 axis drive, the 1st axis will be displayed with the leftmost LED and the 2nd axis will be displayed on the rightmost LED. Troubleshooting for various alarms can be found below.

When assessing the functionality of an Okuma AC Servo Drive, our expert repair team conducts a four-step evaluation:

  • 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 Okuma MIVxxx-1-Bx Servo 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

Input testing is primarily done with the power supply unit. In this modular, bus-linked style communication, the servos and spindle units take power off a shared bus.

Output Module Testing

Using a multimeter, the output protection circuitry can be checked. It is important to make sure there are no dead shorts to ground on any output. Additionally, it is crucial to see proper, balanced output across the 3 phases. For the readings below, set the multimeter to the diode function and measure across the indicated bus terminals and outputs.

Positive Lead Negative Lead Reading
U 'P' Terminal 0.350V-0.370V
V 'P' Terminal 0.350V-0.370V
W 'P' Terminal 0.350V-0.370V
'N' Terminal U 0.350V-0.370V
'N' Terminal V 0.350V-0.370V
'N' Terminal W 0.350V-0.370V

Common Alarms for the Okuma MIVxxx-1-Bx AC Servo Drive Series

Alarm Code Description Quick Checks
01 Power Supply Unit Error
  • Check the source voltage
  • Check the operation conditions
  • Check the error No. of MPS/MPR unit. Change the MPS/MPR unit.
  • If the bus voltage is ok and there are no issues with the power supply, repair the MIV unit
04 Motor Power Line Overcurrent
  • Meg the motor while disconnected from the drive
  • Verify proper wiring
  • Change axis motors if possible
  • Check drive outputs
  • Repair Drive
05 Inverter Overheat
  • Check for any debris lodged in heat sinks or fans
  • Check the operating conditions of the unit
10 Encoder Communication Error
  • Check the encoder of the corresponding axis
  • Change the encoder link cable
32 Speed Deviation Too Large
  • Reduce cutting torque
  • Check Encoder
  • Swap encoder cables
  • Meg Motor

Precision Zone is focused on getting your business back up and running. Not only do we offer free technical support from our amazing team of engineers, but we also offer a multitude of resources to assist you with troubleshooting and to help you make the right decision for your business. For more information on these alarms for the Okuma BLIV-D Servo Drive Series and all other machine related issues, please contact us for additional assistance via phone at 800-551-4420 or email at repair@precisionzone.com

Discover Repair Benefits to repairing your Servo Drives with Precision Zone

  • Free Quotes and Evaluation by expert technicians
  • We have a thorough evaluation process that utilizes visual, static, and power tests to determine the failure of the product so you get a comprehensive and accurate quote. Everytime.
  • 1-Year Warranty
  • All products are covered by our comprehensive warranty. Warranty terms and conditions are product specific.
  • Competitive Pricing
  • We know that you have many different options to go to for your repairs. However, we pride ourselves in being able to provide you with a more affordable and competitive repair option with out sacrificing the quality of service we provide.
  • Flexible Rush Repair
  • To minimize your equipment downtime, we offer mutliple rush repair options. Standard repair time is typically 1-2 weeks. Rush repair options include 3 day, 2 day, next day, and even same day repairs.

Contact Us To Start Your Repair Today!


Recently Repaired Products

Okuma MIV06-1-B1 image MIV06-1-B1 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans, Bad DC Bus Capacitors, Bad Magnetic Contactor, Relay, Bad Power Section/Board
Drive Type: MIV Inverter
L-axis Capacity: 6.0kW
M-axis Capacity: If only 1-axis (blank)
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 1

Okuma MIV06-1-B5 image MIV06-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Magnetic Contactor, Relay, Bad Output Transistors/SCRs
Drive Type: MIV Inverter
L-axis Capacity: 6.0kW
M-axis Capacity: If only 1-axis (blank)
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV0303-1-B1 image MIV0303-1-B1 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans, Bad Magnetic Contactor, Relay
Drive Type: MIV Inverter
L-axis Capacity: 3.0kW
M-axis Capacity: 3.0kW
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 1

Okuma MIV05-1-B3 image MIV05-1-B3 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: May Require Board Replacement, Multiple signs of previous repair, Physical Damage to the Circuit Board/s, Physical Damage to the Drive
Drive Type: MIV Inverter
L-axis Capacity: 5.0kW
M-axis Capacity: If only 1-axis (blank)
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 3

Okuma MIV03-1-B5 image MIV03-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans, Bad Gate Section/Board
Drive Type: MIV Inverter
L-axis Capacity: 3.0kW
M-axis Capacity: If only 1-axis (blank)
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV0204A-1-B5 image MIV0204A-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans
Drive Type: MIV Inverter
L-axis Capacity: 2.0kW
M-axis Capacity: 4.0kW
Design Revision Order: A
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV05-1-B1 image MIV05-1-B1 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Control Section/Board, Bad Cooling Fans, Physical Damage to the Circuit Board/s
Drive Type: MIV Inverter
L-axis Capacity: 5.0kW
M-axis Capacity: If only 1-axis (blank)
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 1

Okuma MIV0203-1-B1 image MIV0203-1-B1 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans
Drive Type: MIV Inverter
L-axis Capacity: 2.0kW
M-axis Capacity: 3.0kW
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 1

Okuma MIV0203-1-B3 image MIV0203-1-B3 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans
Drive Type: MIV Inverter
L-axis Capacity: 2.0kW
M-axis Capacity: 3.0kW
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 3

Okuma MIV0204-1-B5 image MIV0204-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Brake Transistor (Regen), Bad Circuit Board Component(s), Bad Magnetic Contactor, Relay, Bad Output Transistors/SCRs
Drive Type: MIV Inverter
L-axis Capacity: 2.0kW
M-axis Capacity: 4.0kW
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV08A-1-B5 image MIV08A-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Circuit Board Component(s), Bad Cooling Fans, Multiple signs of previous repair
Drive Type: MIV Inverter
L-axis Capacity: 7.5kW
M-axis Capacity: If only 1-axis (blank)
Design Revision Order: A
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV04A-1-B5 image MIV04A-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Circuit Board Component(s), Bad Cooling Fans, Bad Capacitor(s)
Drive Type: MIV Inverter
L-axis Capacity: 4.0kW
M-axis Capacity: If only 1-axis (blank)
Design Revision Order: A
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV0103-1-B1 image MIV0103-1-B1 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Circuit Board Component(s), Bad Cooling Fans, Bad Gate Section/Board
Drive Type: MIV Inverter
L-axis Capacity: 1.0kW
M-axis Capacity: 3.0kW
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 1

Okuma MIV0104A-1-B5 image MIV0104A-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans
Drive Type: MIV Inverter
L-axis Capacity: 1.0kW
M-axis Capacity: 4.0kW
Design Revision Order: A
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV0404A-1-B5 image MIV0404A-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Circuit Board Component(s), Bad Cooling Fans, Bad Gate Section/Board, Bad Magnetic Contactor, Relay
Drive Type: MIV Inverter
L-axis Capacity: 4.0kW
M-axis Capacity: 4.0kW
Design Revision Order: A
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV0202-1-B5 image MIV0202-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans, Bad Gate Section/Board
Drive Type: MIV Inverter
L-axis Capacity: 2.0kW
M-axis Capacity: 2.0kW
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV01-1-B5 image MIV01-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Cooling Fans, Bad Capacitor(s), Bad Circuit Board Component(s), Bad DC Bus Capacitors, Physical Damage to the Drive
Drive Type: MIV Inverter
L-axis Capacity: 1.0kW
M-axis Capacity: If only 1-axis (blank)
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV0203-1-B5 image MIV0203-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans, Bad Gate Section/Board
Drive Type: MIV Inverter
L-axis Capacity: 2.0kW
M-axis Capacity: 3.0kW
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV04-1-B1 image MIV04-1-B1 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad DC Bus Capacitors, Bad Gate Section/Board, Multiple signs of previous repair
Drive Type: MIV Inverter
L-axis Capacity: 4.0kW
M-axis Capacity: If only 1-axis (blank)
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 1

Okuma MIV0104-1-B1 image MIV0104-1-B1 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans, Bad Gate Section/Board
Drive Type: MIV Inverter
L-axis Capacity: 1.0kW
M-axis Capacity: 4.0kW
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 1

Okuma MIV0404-1-B1 image MIV0404-1-B1 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Control Section/Board
Drive Type: MIV Inverter
L-axis Capacity: 4.0kW
M-axis Capacity: 4.0kW
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 1

Okuma MIV22A-1-B5 image MIV22A-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s)
Drive Type: MIV Inverter
L-axis Capacity: 22kW
M-axis Capacity: If only 1-axis (blank)
Design Revision Order: A
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV0404-1-B5 image MIV0404-1-B5 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad DC Bus Capacitors, Bad Gate Section/Board, May Require Board Replacement, Multiple signs of previous repair
Drive Type: MIV Inverter
L-axis Capacity: 4.0kW
M-axis Capacity: 4.0kW
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 5

Okuma MIV0404-1-B3 image MIV0404-1-B3 is an
Drives-AC Servo manufactured by Okuma
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Gate Section/Board
Drive Type: MIV Inverter
L-axis Capacity: 4.0kW
M-axis Capacity: 4.0kW
Design Revision Order: (blank)
Inverter Control Board Type: ICB1
Motor Type: BL Motor / PREX motor
Control ROM Type: 3