Recently, a Mitsubishi MDS-DH-SP-200 spindle drive unit was sent to us for repair. The customer reported that the device regularly displayed the alarm “A.17,” causing production downtimes.

Upon arrival at our facility, the unit underwent thorough cleaning to eliminate possible contamination and ensure clear visibility of all components. Subsequently, we conducted a detailed inspection to identify the root causes of the alarm “A.17.”

This alarm indicates issues within the internal current circuit, typically resulting from component wear or thermal overload. Our experienced technician team proactively replaced common wear parts, including capacitors and semiconductor components, and also performed preventive maintenance to avoid future disruptions.

After completing the repairs, the spindle drive unit was extensively tested. We strictly adhered to the manufacturer’s specifications to ensure that all parameters were met perfectly and the device operated reliably over the long term.

The outcome: The Mitsubishi MDS-DH-SP-200 spindle drive unit resumed error-free and reliable operation. The customer was able to immediately restart their machine, delighted by the swift and uncomplicated repair.

Our experience once again highlights the importance of regular maintenance and preventive repairs to minimize production downtimes caused by preventable alarms.

To mentioned Mitsubishi Drive: Mitsubishi MDS-DH-SP-200 spindle drive unit

More details about our Mitsubishi repair services can be found here:
Mitsubishi drive Repair by Industrypart

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Device Description and Technical Data

The Mitsubishi MDS-DH-SP-200 spindle drive unit is a control and power regulation unit for spindle motors used primarily in CNC machine tools.

Technical Specification: Value

• Power: 37 kW
• Input Voltage: DC 513–648 V
• Input Current: 99 A
• Output Voltage: 3-phase, 340 V
• Output Current: 85 A
• Frequency Range: 0–1167 Hz
• Software Version: +50T1W002 A9
• Hardware Version: E
• Serial Number: J3A80G5241T
• Manufacture Date: 07/2012

Alarm Messages and Troubleshooting

Alarm Code: A.17
Meaning: A/D Converter Error (Current feedback fault)
Possible Causes: Current sensor fault, internal IPM fault, internal short-circuit
Solutions/Troubleshooting: Inspect device, replace defective IPM unit if necessary, check wiring

Alarm Code: 11
Meaning: Incorrect axis selection
Possible Causes: Incorrect axis switch setting
Solutions/Troubleshooting: Adjust axis switch correctly

Alarm Code: 12
Meaning: Memory error
Possible Causes: CPU or internal memory defect
Solutions/Troubleshooting: Replace unit

Alarm Code: 13
Meaning: Software processing error
Possible Causes: Error during software execution
Solutions/Troubleshooting: Replace unit, verify environmental conditions

Alarm Code: 30
Meaning: Over regeneration
Possible Causes: Brake resistor overload
Solutions/Troubleshooting: Check or expand resistor

Alarm Code: 34
Meaning: CRC error NC-DRV communication
Possible Causes: Communication error between CNC and drive unit
Solutions/Troubleshooting: Check cables and connectors

Alarm Code: 50
Meaning: Overload (Spindle/Motor)
Possible Causes: Motor or drive unit overloaded
Solutions/Troubleshooting: Reduce load, check parameters

Alarm Code: 87
Meaning: Communication error between drive units
Possible Causes: Faulty connection of drive units
Solutions/Troubleshooting: Check optical cables, replace if necessary

Alarm Code: 88
Meaning: Watchdog error
Possible Causes: Internal monitoring system fault
Solutions/Troubleshooting: Check software version, replace unit if necessary