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Our Team Expertly Repairs Mitsubishi MDS-A-SP & MDS-B-SP Spindle Drives

Here at Precision Zone, one of our specialties is the repair services of Mitsubishi Spindle units. One series that we often work on is the MDS-A-SP and MDS-B-SP series.

The Mitsubishi MDS-A-SP and MDS-B-SP unit is offered in sizes starting at 0.4kW and leads up to 55kW. It also has a few features which make it easy and effective to use within a system. An easy to read display allows for quick alarm reading for troubleshooting as well as easy monitoring for each unit. The converter, which was conventionally built within the spindle, is now located within the power supply unit. This allows the spindle unit to be smaller in size and also much lighter than previous versions.

Through the use of a high-speed CPU, speed response is improved and allows for quicker maneuverability. Additionally, spindle parameters can all be loaded from the NC side allowing enhanced operability.

When assessing the functionality of a drive, our 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 Mitsubishi MDS-A-SP & MDS-B-SP Series

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

Intput Module Testing

On MDS-A-SP and MDS-B-SP units, input modules are tested by opening the drive and checking them within the drive housing. This is not easily accessible like the output module testing, so it’s not recommended to check input modules while onsite, especially if the unit has been previously worked on and is within the warranty timeframe still.

Output Module Testing

The output modules on these units can be tested by use of a digital multimeter with diode checking capabilities. Upon removing the cover, one can now access the required terminals to properly conduct this test. Our technicians are also equipped with huntron devices further verify their integrity.

Positive Lead Negative Lead Reading
U "L+" (Positive Terminal) 0.32V-0.39V
V "L+" (Positive Terminal) 0.32V-0.39V
W "L+" (Positive Terminal) 0.32V-0.39V
"L-" (Negative Terminal) U 0.32V-0.39V
"L-" (Negative Terminal) V 0.32V-0.39V
"L-" (Negative Terminal) W 0.32V-0.39V

MDS-A-SP & MDS-B-SP Common Alarms

List of Alarms

Alarm Code Description Checks
A.12
Memory Error		 The memory IC (SRAM or FROM) check sum was illegal.
  • Attempt a few power cycles, if alarm continues to occur, contact for repair.
  • If intermittent, check issues, with ambient temp, noise, grounding, etc.
A.16
Pole Position detection error		 The differential input of the U, V, or W phase of the pole detection signal of the OHE type detector were "H" or "L".
  • Verify SV25
  • Tug feedback connector slightly to verify it's not loose
  • Check feedback cable with tester
  • Swap amp units to see if alarm follows amp or stays on axis
A.18
Initial Communication Error		 Initial communication error, absolute position of pole position from OHA (Absolute Analog) type detector not correct
  • Refer to checks above for A.16
  • Change the winding changeover switch/contactor
A.21
No Signal Detected 2		 No Signal Detected (2), differential input of A, B, or Z, phase signal from machine end installed detector are both "H" or "L"
  • '4', '5', '8', or '9' is set in SV25, correctly change this value
  • Refer to A.20 in link below
A.32 (3A)
Very Common		 Power Module Error (Overcurrent), IMP used in amp detected an overcurrent
  • Disconnect motor leads from amp
  • Meg the motor
  • Check resistance phase to phase to motor (U, V, W)
  • Check amp output legs to ground for any shorts
A.37
Initial Parameter Error		 Parameter Error
  • Check NC diagnosis screen for illegal parameter No.
  • Verify parameter values are within allowable range
  • Refer to A.34 in link below
A.3B
Power module overheat		 Overheating of the IMP used in the servo drive was detected
  • Verify any cooling devices are functioning properly
  • Check operating ambient temperature
  • Check grounding and any noise generating devices
A.51
Overload Detection 2		 A current command exceeding 95% of the amplifier's maximum current continued for one second or more
  • Disconnect motor leads from amp
  • Meg the motor
  • Check resistance phase to phase to motor (U, V, W)
  • Check amp output legs to ground for any shorts
A.59 Collision detect 2
  • Verify Rotary dial settings
A.9E High-speed serial multi-rotation counter error
  • Refer to A.25 in link below, starting at item 3
No Display Unit display stays blank when power is applied
  • Verify incoming control power, if absent when connected, disconnect and measure incoming leads again

For a full list of Mitsubishi spindle drive alarm troubleshooting, see manual below:

https://s3.amazonaws.com/Icarus/DOCUMENTS/Mitsubishi_Alarms_Faults_2299.pdf

The list of alarms within the manual is a good starting point for troubleshooting Mitsubishi MDS-A-SP and MDS-B-SP spindle drives. If any additional troubleshooting assistance is needed for the MDS-A-SP or MDS-B-SP or any other product, Precision Zone offers free technical support. Feel free to contact us via phone or email to get in touch with our experienced technical support team.

Precision Zone Repair Benefits for Mitsubishi Spindle Drives

    1. FREE evaluation by expert technician includes:
    • Visual Inspection
    • Static Check
    • Power Tests
    2. FREE job estimate
    3. 12 month warranty on our parts and labor
    4. Flat Price
    5. Exchange Option
    6. Rush Service


Recently Repaired Products

Mitsubishi MDS-B-SP-300 image MDS-B-SP-300 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces), No Display
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 30.0kW

Mitsubishi MDS-A-SPH-110 image MDS-A-SPH-110 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: MDS-A-SP AC Spindle Drive
Speed Specification: High Speed (Motor max speed is 10000 RPM or more)
Rated Output Capacity: 11.0kW

Mitsubishi MDS-B-SPH-37 image MDS-B-SPH-37 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Circuit Board Component(s), Bad Cooling Fans, Bad Magnetic Contactor, Relay, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: High Speed (Motor max speed is 10000 RPM or more)
Rated Output Capacity: 3.7kW

Mitsubishi MDS-B-SP-260 image MDS-B-SP-260 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Circuit Board Component(s), Bad Cooling Fans, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 26.0kW

Mitsubishi MDS-B-SP-220 image MDS-B-SP-220 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Bad Gate Section/Board, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces), No Display
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 22.0kW

Mitsubishi MDS-B-SPH-15 image MDS-B-SPH-15 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces), No Display
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: High Speed (Motor max speed is 10000 RPM or more)
Rated Output Capacity: 1.5kW

Mitsubishi MDS-B-SP-185 image MDS-B-SP-185 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces), No Display
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 18.5kW

Mitsubishi MDS-A-SP-260 image MDS-A-SP-260 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Output Transistors/SCRs, Physical Damage to the Drive
Drive Type: MDS-A-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 26.0kW

Mitsubishi MDS-B-SP-150 image MDS-B-SP-150 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces), Missing parts/components
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 15.0kW

Mitsubishi MDS-B-SP-55 image MDS-B-SP-55 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Bad Gate Section/Board, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces), No Display
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 5.5kW

Mitsubishi MDS-B-SP-75 image MDS-B-SP-75 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces), No Display
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 7.5kW

Mitsubishi MDS-B-SP-110 image MDS-B-SP-110 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Bad Gate Section/Board, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces), No Display
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 11.0kW

Mitsubishi MDS-A-SP-37 image MDS-A-SP-37 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Circuit Board Component(s), Bad Cooling Fans, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: MDS-A-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 3.7kW

Mitsubishi MDS-B-SP-075 image MDS-B-SP-075 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Power Section/Board, Bad Circuit Board Component(s)
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 0.75kW

Mitsubishi MDS-B-SPH-300 image MDS-B-SPH-300 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: High Speed (Motor max speed is 10000 RPM or more)
Rated Output Capacity: 30.0kW

Mitsubishi MDS-B-SPH-110 image MDS-B-SPH-110 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Capacitor(s), Bad Cooling Fans, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: High Speed (Motor max speed is 10000 RPM or more)
Rated Output Capacity: 11.0kW

Mitsubishi MDS-B-SP-37 image MDS-B-SP-37 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Circuit Board Component(s), Bad Cooling Fans, Bad Magnetic Contactor, Relay, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 3.7kW

Mitsubishi MDS-A-SP-75 image MDS-A-SP-75 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: May Require Board Replacement, Bad Cooling Fans, Bad Circuit Board Component(s), Bad Gate Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: MDS-A-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 7.5kW

Mitsubishi MDS-B-SPH-150 image MDS-B-SPH-150 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Circuit Board Component(s), Bad Cooling Fans, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: High Speed (Motor max speed is 10000 RPM or more)
Rated Output Capacity: 15.0kW

Mitsubishi MDS-B-SP-15 image MDS-B-SP-15 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Bad Magnetic Contactor, Relay, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 1.5kW

Mitsubishi MDS-A-SP-300 image MDS-A-SP-300 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces), Bad Circuit Board Component(s)
Drive Type: MDS-A-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 30.0kW

Mitsubishi MDS-B-SP-450 image MDS-B-SP-450 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Circuit Board Component(s), Bad Cooling Fans, Bad Gate Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 45.0kW

Mitsubishi MDS-B-SPM-370 image MDS-B-SPM-370 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Parameter/Setting Adjustment
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: For IPM (internal permanent magnet) motors
Rated Output Capacity: 37.0kW

Mitsubishi MDS-B-SP-370 image MDS-B-SP-370 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Cooling Fans, Leaky Capacitors (Open, Corroded Traces), Passed Testing - Highly Recommend Recondition
Drive Type: MDS-B-SP AC Spindle Drive
Speed Specification: Standard
Rated Output Capacity: 37.0kW