A Mitsubishi MDS-D-SP-200 spindle drive was sent to industrypart for repair with alarm 17. We reproduced the reported fault during incoming inspection. Further diagnosis identified a defect in the internal power supply. After repair and overhaul, the unit passed a test with a spindle at our test bench. The alarm did not recur during that test.

Nameplate data

The ratings are transcribed from the supplied photograph. The 18.5 kW marking includes a 50% ED duty rating; it is not presented as a continuous output rating. The date marking is reproduced as printed.

Incoming inspection and workshop findings

The reported alarm could be reproduced during our incoming inspection. The subsequent examination identified a defect in the unit’s internal power supply. This specific finding provided the basis for the repair.

Alarm 17 and the internal power supply

The manufacturer’s alarm definition identifies the affected functional area. The internal power supply defect is the result of our examination of this particular unit. Alarm 17 alone therefore does not identify a specific failed component.

Electronic measurement and signal-processing circuits require a stable supply. An internal supply fault can also affect the processing of measurement signals, providing a possible technical link to current feedback. The affected supply rail and individual component are not documented for this report, so no more specific component-level cause is claimed.

Selected relevant alarms

Reference for MDS-D/DH servo and spindle drives. Only alarm 17 was reported in this repair case. The other entries provide context and are not additional findings.

Source: Mitsubishi MDS-D/DH Series Instruction Manual, IB-1500025(ENG)-H, sections 6-2 and 6-3, pp. 6-5 and 6-13 (PDF pp. 426 and 434). The alarm reference is a different document from the specifications manual IB-1500875 printed on the nameplate.

Additional cross-check: the supplied extract “Alarme _ Troubleshooting-40.pdf”, pp. 6-4, 6-5 and 6-13 (file pages 2, 3 and 11), confirms the alarm meanings used here. The extract identifies the MDS-D/DH series but does not specify a separate revision.

Repair, cleaning and overhaul

We corrected the fault, thoroughly cleaned the spindle drive and overhauled it. Wear-prone components were also renewed. After completing the work, we tested the unit with a spindle at our test bench. The test was successful and alarm 17 did not recur.

Planning preventive maintenance

Professional condition assessment, cleaning and preventive overhaul can help identify developing ageing and wear. The scope and intervals depend on the condition of the unit, operating conditions and manufacturer instructions. The supply fault found here does not mean that every unit displaying alarm 17 requires the same component replacements.

Repair and test-bench work

The video explains the repair case and provides an insight into our test-bench work.

Before repair

After repair, before dispatch

Enquire about Mitsubishi spindle drive repair

Does your Mitsubishi spindle drive display an alarm? Send us the complete model designation, a nameplate photograph, the alarm indication and a description of when the fault occurs. industrypart supports you with diagnosis, repair and preventive overhaul of industrial drive electronics.

Mitsubishi MDS-D-SP-200 Spindle Drive Unit in our shop

For more information about our repairs of Mitsubishi servo and spindle drives, visit our Mitsubishi repair service page.