Power Supply

Regenerative Converter Power Supply – MITSUBISHI MDS-B-CVE-185

The MDS-B-CVE-185 is a regenerative converter power supply (“Regenerative Converter Power Supply”) manufactured by Mitsubishi Electric, the central power unit of the MDS-B drive system for CNC machining centres and lathes. The unit converts three-phase mains voltage to a DC bus voltage, cascading power to the connected axis drive units (MDS-B-V) and spindle drive units (MDS-B-SP) on the same bus. The designation CVE identifies the converter function with regenerative energy recovery; the number 185 denotes the rated DC bus current in Amperes. The unit is documented in control architectures based on the Mitsubishi M64, M700 and C70 CNC controllers. No hardware revisions or standard included accessories are known.

The regenerative converter power supply is the primary power unit of the entire drive system: without it, no axis or spindle can receive power, bringing the machine to a complete standstill. The regenerative function also returns the kinetic energy accumulated during deceleration back to the mains, reducing peak current draw and protecting the DC bus from dangerous overvoltages.

Mitsubishi Electric is one of the leading divisions of the Mitsubishi group, active in CNC and industrial automation since the 1970s. The MDS-B series represents a well-established generation of digital drives, now technically superseded by the MDS-C1, MDS-D and MDS-EJ systems. All MDS-B products are legacy / discontinued: supply is exclusively through surplus, used stock, or specialist repair.

Main Technical Specifications

DC Bus Converter / Power Supply Unit – MITSUBISHI MDS-B-CV-300

The MDS-B-CV-300 is a DC bus converter unit (“Converter Unit”) from the MDS-B series by Mitsubishi Electric, used in Mitsubishi CNC drive systems (series M64, M700, M70, E60, E68 and associated machines). The unit rectifies and filters the three-phase mains input voltage to generate the DC bus that simultaneously powers all MDS-B servo and spindle modules installed in the cabinet. The suffix 300 indicates a rated capacity of approximately 30 kVA, placing this unit in the upper-mid range of the product line. No standard additional accessories are included; hardware revisions may differ in signal connector layout.

The DC bus converter is the backbone of the entire drive system power supply: without a stable bus voltage, neither the servo axes nor the spindle can be controlled. A failure of this unit completely shuts down the machine tool; incorrect or unstable bus voltages cause following errors, over/under-voltage alarms on the axes and, in the worst cases, cascading damage to the connected servo modules.

Mitsubishi Electric is the electrical and industrial automation division of the Japanese Mitsubishi conglomerate, active in the CNC sector with the MELSERVO and Mitsubishi CNC systems (M, E, C series). The MDS-B series is a previous-generation servo/spindle drive platform, now legacy / discontinued and superseded by the MDS-C1, MDS-D and MDS-EJ series; official support is limited and sourcing relies mainly on used stock or specialist repair services.

Main Technical Specifications

Power Supply Converter Module – MITSUBISHI MDS-C1-CV-150

The MDS-C1-CV-150 is a power supply converter module (“Power Supply Converter Unit”) manufactured by Mitsubishi Electric, belonging to the MDS-C1 servo drive family for MELDAS CNC systems (series M64, M65, M66). The module operates as an AC–DC rectifier/converter: it receives three-phase AC mains power and generates a shared DC bus voltage for the MDS-C1-V axis servo drives and MDS-C1-SP spindle drives connected in cascade on the same bus. It incorporates regenerative braking circuits to return energy to the supply during deceleration phases. The numeric suffix 150 denotes the nominal power class of the converter.

The power supply converter unit is the heart of the drive system power architecture: without it, no servo axis or spindle controlled by the MDS-C1 family can be energised. A converter failure causes the immediate and total shutdown of the machine tool: all axes and the spindle lose DC bus power and the CNC immediately raises a power supply alarm. Its functional integrity is therefore an absolute prerequisite for commissioning and normal machining operation.

Mitsubishi Electric is one of the world’s leading manufacturers of CNC systems, servo drives, and industrial automation components, present in the sector for over half a century through its MELDAS product line. The MDS-C1 series is a legacy / discontinued family: it has been progressively replaced by the MDS-D, MDS-EJ, and MDS-E series, which remain in active production and support.

Main Technical Specifications