Our Team Repairs Okuma DC-S1x Power Supply Modules

Power supplies are one of the most essential parts of the servo line and here at Precision Zone, we specialize in the repair of these power supply units. One of popular Okuma products we deal with here is the DC-S1 line of power supplies.

This can supply power for multiple axes from a single 3-phase input voltage. We have a specially designed custom simulator for fully testing these units in a live setting.

When assessing the functionality of the 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-S1x 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.

There are checkpoints on the top of the PCB for 3.6V and 15V which is checked for shorts to the ground checkpoint.

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

Once the unit has been statically checked and ready to be powered up, we put this power supply into our specially designed simulator. Any alarms codes on the control are noted and subsequently repaired. Before sending the unit back to our customer, we ensure that the power supply is fully tested in our simulator and the unit is fully operational in a complete system. The DC-S1 power supplies have 2 LEDs that indicate status. The ‘PSON’ shows that the power supply is successfully regulating voltage. The ‘OH’ alarm LED lights when an error occurs, such as the power supply overheating.

When powered up, all voltages on the test points are verified and the VH and VL voltages are checked. Common issues with these units include board level components overheating over time. We specialize in replacing these components, cleaning all PCB corrosion and bringing the power supply back to normal working condition.

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 DC-S1A-2 image DC-S1A-2 is an
Part of machine manufactured by Okuma
Discovered issues: Leaky Capacitors (Open, Corroded Traces), Missing parts/components
Model Number: DC-S1A
Number of Axes (Part #): 2 (E0451-596-002)

Okuma DC-S1B-6 image DC-S1B-6 is an
Part of machine manufactured by Okuma
Discovered issues: Bad Bridge Rectifier, Bad Main Power Transistor(s), Leaky Capacitors (Open, Corroded Traces), Open Resistor(s)
Model Number: DC-S1B
Number of Axes (Part #): 6 (E0451-596-003)