Precision Zone Expertly Repairs Drives-AC Spindle Mitsubishi MDS-C1-SP

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-C1-SP series of AC spindles.

OThe MDS-C1-SP series is a direct replacement for the previous MDS-A and MDS-B revisions of the spindle unit. The rated capacities start at 0.4kW (MDS-C1-SP-04 ~ base model) and can go up to 30.0kW options (MDS-C1-SP-300 ~ base model). Additionally, there are standard, high speed (10,000 rpm or above), and IPM versions of this unit available and will be application dependent.

This series received a component overhaul and with a high-speed CPU and improved positioning control allows for an increase in speed response and improved cutting performance. An updated, high-speed orientation method has been implemented to allow smooth operation and minimal time required to complete an orientation. Spindle parameters are set from the NC and can be viewed on the control screen, allowing for even easier access and that ability to quickly change parameters if necessary.

When assessing the functionality of a spindle drive unit, our repair team typically 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 Mitsubishi FR-SF AC Spindle Drive Units

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

On MDS-C1-SP unit, 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 on-site. If the unit has been previously worked on and is within the warranty timeframe, it's highly advised against opening the unit as that can void the warranty.

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

Mitsubishi MDS-C1-SP Spindle Drive Unit Common Alarms

Alarm Code Description Checks
AL. 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.
AL. 16
Pole Position Detection Error
The differential input of the U, V or W phase of the pole position detection signal of the OHE type detector were both "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
AL. 18
Initial communication error
Initial communication error, absolute position or pole position from OHA (Absolute analog) type detector not correct
  • Refer to checks above, A.16
AL. 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
AL. 32 (3A)
Very Common
Power module error (Over current), IPM used in amp detected an over current
  • 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
AL. 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
AL. 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
AL. 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
AL. 59 Collision Detection 2
  • Verify Rotary Dial Settings
A.9E High-speed 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 FR-SF spindle drives. If any additional troubleshooting assistance is needed for the FR-SF unit 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-C1-SPH-300 image MDS-C1-SPH-300 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Wrong/corrupted parameters
Drive Type: MDS-C1-SP AC Spindle Drive
Design Revision Specification: High speed, 10000 RPM or more; IM standard specifications
Output Capacity: 30.0kW
Enclosure Type: Standard Type

Mitsubishi MDS-C1-SP-300 image MDS-C1-SP-300 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: No Display, Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans
Drive Type: MDS-C1-SP AC Spindle Drive
Design Revision Specification: Standard
Output Capacity: 30.0kW
Enclosure Type: Standard Type

Mitsubishi MDS-C1-SPH-110 image MDS-C1-SPH-110 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans
Drive Type: MDS-C1-SP AC Spindle Drive
Design Revision Specification: High speed, 10000 RPM or more; IM standard specifications
Output Capacity: 11.0kW
Enclosure Type: Standard Type

Mitsubishi MDS-C1-SPH-260 image MDS-C1-SPH-260 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-C1-SP AC Spindle Drive
Design Revision Specification: High speed, 10000 RPM or more; IM standard specifications
Output Capacity: 26.0kW
Enclosure Type: Standard Type

Mitsubishi MDS-C1-SP-185 image MDS-C1-SP-185 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans
Drive Type: MDS-C1-SP AC Spindle Drive
Design Revision Specification: Standard
Output Capacity: 18.5kW
Enclosure Type: Standard Type

Mitsubishi MDS-C1-SP-220 image MDS-C1-SP-220 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans
Drive Type: MDS-C1-SP AC Spindle Drive
Design Revision Specification: Standard
Output Capacity: 22.0kW
Enclosure Type: Standard Type

Mitsubishi MDS-C1-SP-75 image MDS-C1-SP-75 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Circuit Board Component(s), Bad Cooling Fans, Leaky Capacitors (Open, Corroded Traces)
Drive Type: MDS-C1-SP AC Spindle Drive
Design Revision Specification: Standard
Output Capacity: 7.5kW
Enclosure Type: Standard Type

Mitsubishi MDS-C1-SPM-220 image MDS-C1-SPM-220 is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Circuit Board Component(s)
Drive Type: MDS-C1-SP AC Spindle Drive
Design Revision Specification: For IPM (internal permanent magnet) motors
Output Capacity: 22.0kW
Enclosure Type: Standard Type

Mitsubishi MDS-C1-SP-150S image MDS-C1-SP-150S is an
Drives-AC Spindle manufactured by Mitsubishi
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans
Drive Type: MDS-C1-SP AC Spindle Drive
Design Revision Specification: Standard
Output Capacity: 15.0kW
Enclosure Type: Slim Type