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MITSUBISHI Servo Drive
Brand: MITSUBISHI -
Cat: Servo Drive
Code:MDS-C1-SP-220
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AC Digital Spindle Drive Amplifier – MITSUBISHI MDS-C1-SP-220
The MDS-C1-SP-220 is an AC digital spindle drive amplifier (“AC Digital Spindle Drive Amplifier”) manufactured by Mitsubishi Electric, belonging to the MDS-C1-SP series. It is documented as a component of CNC systems equipped with MELDAS controllers (series M64, M700, M720 and related) on machining centres, CNC lathes, and milling centres. The unit manages vector control of speed and torque of the AC spindle motor, receiving commands from the CNC unit via a serial fiber-optic link. The suffix SP identifies the spindle family (“Spindle”), while the number 220 indicates the rated current class; variants in the series include SP-80, SP-150, SP-220, and SP-300.
The spindle drive amplifier converts the speed reference sent by the CNC unit into variable-frequency AC power delivered to the spindle motor, maintaining stable and precise speed and torque throughout machining. It is the critical component in the spindle control loop: a failure causes immediate spindle shutdown and complete machine downtime, making any machining operation impossible until the unit is replaced or repaired by a specialist.
Mitsubishi Electric is one of the world’s leading manufacturers of industrial automation systems, CNC controllers (MELDAS / MELDASMAGIC range) and MDS-series drives. The MDS-C1 series has been progressively replaced by the MDS-C2, MDS-D, and MDS-E series; products in the C1 family are therefore legacy / discontinued and available only as used, NOS/surplus, or through specialist repair.
Main Technical Specifications
| Type | AC digital spindle drive amplifier |
| Part number | MDS-C1-SP-220 (MDSC1SP220) |
| Brand | Mitsubishi Electric |
| Known application | CNC machine tools with Mitsubishi MELDAS controller (M64, M700, M720 and related series); machining centres, CNC lathes, milling centres |
| Function | Vector control of AC spindle motor speed and torque; variable-frequency power conversion |
| Input voltage | 3-phase 200–230 V AC, 50/60 Hz (typical MDS-C1 series; verify variant for 400 V networks) |
| Rated current | ~220 A nominal (SP-220 class; power class ~22 kW) |
| CNC communication | Serial fiber-optic link to MELDAS CNC unit (connectors CN1A / CN1B) |
| Interfaces / connectors | Fiber-optic bus connectors CN1A/CN1B, spindle encoder/feedback connector CN2, power terminal blocks R/S/T (AC input) and U/V/W (motor output), auxiliary digital I/O |
| Weight | ~8–15 kg |
| Dimensions | ~300–450 × 200–300 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |
