Mitsubishi Electric FR-CV-15K Regenerative Converter Unit – FR-CV Series

FR-CV-15K: Bidirectional Power Flow Architecture in Variable-Frequency Drive Systems

The Mitsubishi Electric FR-CV-15K is a 15 kW power regeneration converter unit engineered to interface directly with the FR-A700, FR-A800, FR-F700, and FR-F800 inverter families. Unlike conventional braking resistor topologies that convert deceleration energy into heat, the FR-CV-15K establishes a controlled bidirectional power path between the DC bus of the connected inverter and the upstream three-phase AC supply. During motoring, the unit operates transparently; during regenerative braking events, it actively commutates excess DC bus energy back to the grid at near-unity power factor, with total harmonic distortion (THD-I) held below 5% under rated load conditions.

The converter’s IGBT bridge operates at a fixed carrier frequency synchronized to the supply fundamental, enabling precise phase-locked loop (PLL) control of the regenerated current waveform. This architecture eliminates the thermal management burden associated with braking resistors and removes the need for oversized panel ventilation in high-cycle applications such as crane hoists, centrifuges, and press drives.

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Technical Parameters

Hardware Logical Analysis

The FR-CV-15K employs a three-phase full-bridge IGBT inverter stage operating in current-controlled PWM mode. The control board continuously samples the AC supply voltage via a dedicated voltage sensing circuit, extracts the fundamental frequency and phase angle through a digital PLL algorithm, and uses this reference to modulate the IGBT gate signals so that the regenerated current is injected in phase with the supply voltage. This active front-end approach achieves a displacement power factor of ≥ 0.98 without external power factor correction capacitors.

EMC compliance is achieved through a multi-layer strategy: an integrated line reactor on the AC input side limits di/dt and attenuates high-frequency switching noise propagating back to the supply bus; the PCB layout separates high-current switching traces from low-level signal traces with a dedicated ground plane; and the enclosure uses conductive gaskets at all panel joints to maintain shielding continuity above 30 MHz. The result is compliance with EN 61800-3 Category C2 without additional external filters in most installation configurations.

Thermal management relies on a forced-air channel that draws ambient air across the IGBT heatsink from the bottom intake and exhausts from the front face. An NTC thermistor embedded in the heatsink feeds the control board’s thermal protection loop: at 85 °C junction estimate, output current is linearly derated; at 95 °C, the unit triggers a fault output and inhibits gate drive to prevent thermal runaway. This two-stage thermal response protects the IGBT modules without nuisance tripping in transient overload conditions.

The DC bus connection to the host inverter uses a low-inductance busbar interface. Stray inductance in this path is minimized to reduce voltage overshoot during commutation, which directly lowers the voltage stress on the IGBT collector-emitter junction and extends device service life under repetitive braking cycles.

System Integration Benefits

• Deterministic DC Bus Voltage Regulation: The FR-CV-15K clamps the inverter DC bus within a defined voltage window during regeneration, preventing overvoltage trips that would otherwise interrupt the control loop and require a restart sequence — critical in continuous-process applications.
• Elimination of Braking Resistor Thermal Load: Removing the braking resistor from the panel reduces the steady-state heat dissipation budget by up to 15 kW peak, allowing a reduction in panel cooling capacity or an increase in the number of drives per enclosure.
• Near-Unity Input Power Factor: The active rectification stage presents a resistive load characteristic to the supply transformer, reducing reactive current demand and lowering transformer copper losses — measurable on sites with power factor penalty tariffs.
• Low Harmonic Injection: THD-I below 5% satisfies IEEE 519-2014 and EN 61000-3-12 harmonic limits without additional passive harmonic filters, simplifying compliance documentation for grid connection agreements.
• Transparent Diagnostic Integration: Fault status and operational mode of the FR-CV-15K are reflected in the host inverter’s parameter monitor registers, enabling the site SCADA or PLC to read regeneration energy totals and fault history through the existing communication network without additional field devices.
• Scalable Parallel Operation: Multiple FR-CV units can be paralleled on a common DC bus to match higher-power inverter ratings, with current sharing managed by the individual units’ current control loops — no external current-sharing reactor required up to the rated parallel configuration.
• Reduced Mechanical Wear on Braking Infrastructure: In crane and hoist applications, the elimination of dynamic braking resistors removes a component with a finite thermal cycle life, reducing scheduled maintenance intervals and unplanned downtime associated with resistor element failure.
• Energy Metering Capability: The regenerated energy returned to the grid can be monitored via the inverter’s energy counter registers, providing data for ISO 50001 energy management reporting and ROI calculation on the regeneration investment.

Quality Assurance & Global Logistics

Every FR-CV-15K unit supplied by siemensplc.com is sourced as genuine Mitsubishi Electric factory production. Units are not remanufactured, relabeled, or modified. The nameplate data, serial number format, and firmware revision are consistent with Mitsubishi Electric’s production records for this part number. Buyers may cross-reference the serial number with Mitsubishi Electric’s regional technical support for authenticity confirmation.

Pre-shipment inspection covers: enclosure integrity and label authenticity; connector and busbar terminal condition; power-on self-test where test equipment is available; and packaging adequacy for international air freight. Each shipment includes a commercial invoice, packing list, and HS code declaration (HS 8504.40) to support customs clearance in the destination country.

Logistics are managed from our warehouse in Xiamen, China. Standard international dispatch uses DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with door-to-door transit times of 3–7 business days to most destinations in Europe, North America, Southeast Asia, and the Middle East. Sea freight consolidation is available for multi-unit orders where lead time permits. Export documentation for dual-use screening and ECCN classification is provided on request.

All units are covered by a 12-month warranty from the date of shipment, covering manufacturing defects and confirmed operational failures under normal operating conditions as defined in the Mitsubishi Electric FR-CV instruction manual.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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