Our Team Repairs Okuma MPxxxx Power Supply Modules

We, at Precision Zone pride ourselves on being repair experts for a multitude of manufacturers and product. One of our biggest manufacturer and product that we specialize in is Okuma Power Supplies.

Okuma’s ‘Motion Control System’ (MCS) consists of an inverter along with a DC power supply unit. This unit, the MP unit, supplies the DC power to all MIV units. The MPxxxx supplies both 300VDC as well as 24VDC control power. Two variations of the MP power supply account for two distinct forms of power regeneration methods. The MPS indicates power regeneration style where the MPR identifies the drive as a resistor regeneration type power supply.

The MPS unit is used in systems that include a spindle drive motor whereas the MPR unit is used with systems that consist only of axis drive motors. For the MPS units, capacity ranges from 5kW up to 60kW. The MPR units have a 5kW and 10kW offering. Another notable difference between the MPS and MPR power supplies lies with a controller ID switch on the MPS unit. The MPR does not have this switch and the switch on the MPS unit should have the entire controller ID switches set to “OFF”.

These power supplies are necessary for running your servo drives and when the power supply goes down, it is necessary to quickly and efficiently repair the unit to get back up and running. Here at Precision Zone, we do just that with our 4 step repair process.

When assessing the functionality of an Okuma power supply, our technician's employ a basic four step troubleshooting process:

    1. Visual Overview
    2. Static Test
    3. Checks With Power Applied to Unit
    4. Verification of Alarm Codes

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 DC-S3x Power Supply

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. 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, printed circuit boards 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

Precision Zone repair technicians use digital multimeters with diode testing capabilities and also take resistance measurements to conduct a static test. For these units, in particular, our team of technicians uses the diode function of the multimeter as well as huntron devices to check the input modules. The capacitor values on the PCBs are verified and any relays, contactors or circuit breakers in the drive are examined to ensure proper functionality.

The capacitor values on the PCBs are verified and any relays, contactors or circuit breakers in the drive are examined to ensure proper functionality.

Checks Under Power and Alarm Code Verification

If the static tests shows that it is safe to power up the unit, our technicians install the MPxxxx power supply into our custom simulator. These units have a status indication given by 7 segment LEDs on the front. There is also a DC bus charge indication lamp and a lamp to indicate any errors with the 24V supply. This 24V supply lamp indicates over voltage of the input, over current of the output and over voltage of the output.

Common alarms are listed in the following table:

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Okuma VAC-5 Common Alarms and Warnings

Alarm Code Description Checks
01 DC Over Voltage
  • Verify incoming voltage to DC power supply
  • Check DC supply output
  • Remove load connections from DC power supply and see if issue remains
02 DC Under Voltage
  • Verify incoming voltage to DC power supply
  • Check DC supply outlet
  • Remove load connections from DC power supply and see if issue remains
08 Over Current in the Power Cable
  • Check the cable for proper insulation resistance and any short circuits
12 Overload in Regeneration
  • Check the power cable
  • Check connector cables between MP power supply and MIV units
30-59 CPU Alarm
  • Replace Unit

For further information on these, and all other system alarms, please give us a call at (847)-465-9060.

Precision Zone Repair Benefits for Okuma Power Supplies

  • Free evaluation by expert technician includes:
    • Visual Inspection
    • Static Checks
    • Power Tests
    Free Job Estimate
  • 12-Month Warranty on Our Parts and Labor
  • Flat Price
  • Exchange Options
  • Rush Service Options

Contact Us To Start Your Repair Today!


Recently Repaired Products

Okuma MPR5 image MPR5 is an
Part of machine manufactured by Okuma
Discovered issues: Bad Hybrid IC’s
Type: DC power supply unit
Regeneration method: Resistor regeneration type
Unit capacity: 5kW
Unit generation: First generation

Okuma MPS30 image MPS30 is an
Part of machine manufactured by Okuma
Discovered issues: Bad Hybrid IC’s
Type: DC power supply unit
Regeneration method: Power regeneration type
Unit capacity: 30kW
Unit generation: First generation

Okuma MPS45 image MPS45 is an
Part of machine manufactured by Okuma
Discovered issues: Bad Hybrid IC’s, Open Resistor(s)
Type: DC power supply unit
Regeneration method: Power regeneration type
Unit capacity: 45kW
Unit generation: First generation

Okuma MPR10 image MPR10 is an
Part of machine manufactured by Okuma
Discovered issues: Bad Hybrid IC’s, Bad Output Section
Type: DC power supply unit
Regeneration method: Resistor regeneration type
Unit capacity: 10kW
Unit generation: First generation

Okuma MPS20 image MPS20 is an
Part of machine manufactured by Okuma
Discovered issues: Bad Hybrid IC’s, Leaky Capacitors (Open, Corroded Traces)
Type: DC power supply unit
Regeneration method: Power regeneration type
Unit capacity: 20kW
Unit generation: First generation

Okuma MPS10 image MPS10 is an
Part of machine manufactured by Okuma
Discovered issues: Bad Hybrid IC’s, Open Resistor(s)
Type: DC power supply unit
Regeneration method: Power regeneration type
Unit capacity: 10kW
Unit generation: First generation

Okuma MPS60 image MPS60 is an
Part of machine manufactured by Okuma
Discovered issues: Bad Fuse, Bad Hybrid IC’s
Type: DC power supply unit
Regeneration method: Power regeneration type
Unit capacity: 60kW
Unit generation: First generation

Okuma MPS45A image MPS45A is an
Part of machine manufactured by Okuma
Discovered issues: Bad Hybrid IC’s, Bad Input Section, Bad Main Power Transistor(s), Bad Output Section
Type: DC power supply unit
Regeneration method: Power regeneration type
Unit capacity: 45kW
Unit generation: Second generation (2004 or later)