12.06.2025 by Viktor Siebert
Mitsubishi MDS-B-SPH-110 Spindle Drive Unit – A Real-Life Repair Challenge With a Happy Ending
An Urgent Case From the Czech Republic.
We recently received a Mitsubishi MDS-B-SPH-110 Spindle Drive Unit from a customer in the Czech Republic. The client, a well-known automotive manufacturer, explained:
“This unit is critical – the machine builder says they can’t supply a replacement for at least four weeks.”
He emphasized the need for express repair, and since we’ve serviced this unit type many times before, we accepted the job without hesitation. But what looked like a standard repair at first glance quickly turned out to be a complex and unusual case.
Far From Standard: The Reality of the Unit’s Condition
During the initial inspection, our workshop team realized this device was nowhere near original condition. When we asked the customer, he admitted that he had already sent it to a local repair provider. Their assessment: “No spare parts available.” They simply returned the unit.
Our workshop manager could only shake his head. The unit appeared to be assembled from at least three different devices:
- The transistor module didn’t match the unit at all.
- The control board came from a more powerful drive – an MDS-B-SPH-150.
- The power section had been tampered with – repaired with crude jumper connections across the board.
Normally a Rejected Case – But We Took It On
Under normal circumstances, we would have rejected this case. The manufacturer would likely not even touch such a device. However, we understood the urgency. The customer had no other option, and we saw an opportunity to build a long-term relationship based on trust.
We agreed on a special repair surcharge and committed to restoring the unit properly.
Our Repair Approach – Detailed Steps
Here’s what our engineers did:
- Replaced the incorrect transistor module with a correct Fuji 7MBP150KB060-03.
- Removed all improper interventions.
- Replaced all critical aged components as a preventive measure.
- Swapped the control board for a proper RK311B or BN634A817G51A.
- Replaced the power board with a correct RK123B-SP-110 or BN634A804G51.
A Satisfied Customer – Back in Production in Just 4 Days
While the repair was indeed more expensive than a standard service, the customer was absolutely satisfied. He was back in production within just four days – far faster than the four weeks quoted by the machine builder.
A Message to the Industry
We often discuss the importance of raising service quality in our industry. It’s time to work together to set real repair standards. This would give customers the confidence to choose specialized service providers – like us – over long manufacturer wait times.
At industrypart GmbH, we’re ready to lead by example.
To mentioned Mitsubishi Drive: Mitsubishi MDS-B-SPH-110 Spindle Drive Unit
Similar type
MDS-B-SP-110
MDS-C1-SPH-110
More details about our Mitsubishi repair services can be found here:
Mitsubishi drive Repair by Industrypart
📞 Feel free to contact us with any questions about your Yaskawa drive technology.
Our expert team is happy to help!
Technical Specifications – MDS-B-SPH-110
| Parameter | Value |
|---|
| Model | MDS-B-SPH-110 |
| Type | AC Spindle Drive Unit (single axis) |
| Input Voltage | DC 270–311 V / AC 200–230 V, 50/60 Hz |
| Input Current | 41 A |
| Output Current | 37 A |
| Output Phase | 3-phase AC |
| Control System | PWM-controlled via Intelligent Power Module (IPM) |
| Manual Reference | BNP-B8390 |
| Serial Number | J7AA7G62910 |
| Software Version | BND525W002B8 |
| Hardware Version | F |
| Manufacturer | Mitsubishi Electric Corporation, Japan |
| Production Date | 98/02 (February 1998) |
| Compatible Motors | SJ-V / SJ-VL / SJ-P series (e.g., SJ-V55-01) |
| Ambient Temperature | Operating: 0–55 °C, Storage: –15 to 70 °C |
| Humidity | Max. 90 % RH (non-condensing) |
| Cooling | Forced-air cooling |
Alarm and Warning Table – MDS-B-SPH-110
| Alarm No. | Abbr. | Description | Operation |
|---|
| 12 | ME1 | Memory error: Checksum or RAM error in the spindle control ROM | PR |
| 13 | SWE | Software error: Data processing did not finish within the set time | PR |
| 17 | ADE | AD converter did not initialize correctly | PR |
| 21 | NS2 | No signal from spindle encoder (e.g. orientation axis, C-axis) | PR |
| 23 | OSE | Excessive deviation in speed or torque command | PR |
| 31 | OS | Overspeed: Motor exceeded 115% of max. speed limit | PR |
| 32 | PMOC | Overcurrent in the IPM of the main spindle circuit | PR |
| 34 | DP | CRC communication error from NC | PR |
| 35 | DE | Data error from NC | PR |
| 36 | TE | Timeout in periodic NC communication | PR |
| 37 | PE | Parameter value exceeded tolerance limit | PR |
| 38 | TP1 | Protocol error with NC (frame error) | PR |
| 39 | TP2 | Protocol error with NC (information error) | PR |
| 40 | KE1 | TK unit changeover procedure error | PR |
| 41 | KE2 | TK unit communication error | PR |
| 44 | CAXE | C-axis changeover alarm (coil switch error in C-axis motor) | NR |
| 46 | OHM | Motor overheat due to cooling fan malfunction | NR |
| 50 | OL | Overload: Motor current exceeded detection level | NR |
| 52 | OD | Excessive position tracking error | NR |
| 5C | ORFE | Orientation pulse exceeded parameter setting | NR |
| 60–7F | — | Alarm occurred in power supply (see power supply section for details) | — |
| 82 | NSP | No signal from power supply: cable disconnection | PR |
| E1 | WOL | Overload warning: Motor exceeded 80% of time constant threshold | PR |
| E7 | NCE | Emergency stop from CNC | PR |
Legend:
- PR: Power module shuts off, spindle coasts to stop, external contactor opens
- NR: Only warning or spindle stops with regenerative braking
- AR: Warning only, operation continues
