Mitsubishi Electric MDS-DH-CV-370 MDS-DH Series Power Supply Unit

Description

Power distribution within demanding multi-axis CNC machine tools is managed directly by the Mitsubishi Electric MDS-DH-CV-370, a high-capacity MDS-DH Series Power Supply Unit. Engineered for the 400V AC class architecture, this converter unit rectifies incoming 3-phase utility power into a stable DC bus voltage to feed coordinate servo drives and high-speed spindle amplifiers. With a robust 30.0kW continuous rated output and a 37.0kW 30-minute transient peak capacity, it ensures reliable energy delivery under severe dynamic loading and rapid deceleration cycles.

Key Features

• Optimized for 400V high-voltage drive topologies, minimizing line current and wiring cross-sections.
• Dual-rated power output structure supporting 30kW continuous operation and 37kW short-term overload demands.
• Slim 150mm physical width profile to optimize control cabinet spatial density.
• Regenerative power capabilities designed to feed braking energy back into the power system when used with specified line components.
• Designed for direct coordination with dedicated AC reactors and magnetic contactors to suppress harmonic distortion and manage inrush currents.

Applications

• Heavy-duty CNC milling and turning centers requiring synchronized multi-axis servo coordination.
• High-speed industrial spindle drive systems with regenerative braking needs.
• Automated automotive powertrain manufacturing cells and metal fabrication equipment.

Technical Specifications

Connections and Interfaces

Alternative Models & Compatibility

The MDS-DH-CV-370 is designed exclusively for 400V class MDS-DH systems and cannot be interchanged with 200V class MDS-D-CV systems. It requires compatible firmware integration matching the connected host CNC system (such as M700/M800 or M70/M80 controllers). When replacing older revisions, verify the total drive load matching parameters to ensure the sum of the connected servo and spindle ratings does not exceed the 53 kVA system capacity.

Application Pitfalls & Engineering Notes

Under heavy deceleration cycles of high-inertia spindle motors, the system relies on line regeneration to dissipate energy back into the network. This process absolutely requires the installation of the matching DH-AL-37K AC reactor. Omitting this reactor or substituting a generic alternative will lead to severe overvoltage (F1 ALM) errors, degradation of internal capacitor banks, and potential thermal breakdown of the input rectifying diodes.

Commissioning & Wiring Tips

Ensure that control power cable routing is physically isolated from the high-voltage DC bus (L+/L-) and AC input lines to minimize EMI noise. Connect the daisy-chained CNC communication bus using high-performance shielded cables, ensuring proper termination at both ends. Verify that the MC (Magnetic Contactor) feedback circuit is properly integrated into the emergency stop loop to safely interrupt AC supply power in the event of an internal system fault.

Installation Guidelines