Technical Specifications

• Input Power: Three Phase AC 380–480V, 50/60Hz
• Rated Input Current: 17A continuous
• DC Bus Output Voltage: Fixed 600V DC ±2%
• Regenerative Power Capacity: 30kW maximum bidirectional power transfer
• Power Factor Correction: PF ≥0.99 full load range
• THD Input Current: ≤3% rated load
• Control Auxiliary Supply: DC 24V ±10%
• Communication Interface: CANopen, RS485
• Dimension: 420mm(H) × 150mm(W) × 210mm(D)
• Net Weight: 8.7kg
• Protection Class: IP20
• Operating Temperature: 0°C ~ +45°C

Function Features

1. Active power factor correction, suppress grid harmonic pollution
2. Bidirectional energy flow: rectify grid AC to DC bus, feed motor braking energy back to power grid
3. Real-time DC bus voltage stabilization, eliminate voltage fluctuation under heavy dynamic load
4. Multi-stage hardware protection: overvoltage, undervoltage, overcurrent, overheat, phase loss, grid surge
5. Real-time operating data upload via bus: input power, regeneration power, DC bus voltage, internal temperature
6. Parallel expansion support, multiple PRD modules connected in parallel for higher total regeneration power
7. Soft start circuit to avoid grid inrush current during power-on

Performance Parameters

• Voltage regulation precision: ±0.5% DC bus full load variation
• Regeneration response speed: <5ms when braking energy generated
• Inrush current suppression: ≤2 times rated input current at startup
• Efficiency: ≥96.5% at rated operating power

Material Composition

• Main Housing: Thick galvanized steel cabinet with powder coating
• Power Heat Sink: Large-size cast aluminum alloy
• Main Power IGBT: High voltage bidirectional switching power tube
• Filter Inductor Core: Silicon steel laminated low-loss magnetic core

Structural Characteristics

1. Vertical cabinet integrated design, top air inlet, bottom air outlet vertical heat dissipation channel
2. Front panel integrated digital display for DC bus voltage, operating power, fault code
3. Top three-phase AC grid input terminals, bottom DC bus output terminals for drive connection
4. Built-in high-capacity EMC filter to reduce grid electromagnetic interference
5. Dual cooling fans with temperature-controlled automatic speed adjustment

Working Principle

1. Three-phase AC grid input passes EMC filter and soft start circuit to active PFC rectifier stage
2. PFC circuit adjusts input current phase to align with grid voltage, maintain power factor near unity
3. Rectifier stage generates stable constant 600V DC bus voltage for all connected AKD/S series servo drives
4. When motors decelerate/gravity load descends, mechanical energy converts to electrical energy flowing back to DC bus
5. PRD inversion stage converts excess DC power back to three-phase AC and feeds into factory power grid
6. Internal DSP monitors DC bus voltage in real time, dynamically adjusts rectifier/inverter operating mode

Advantage Highlights

1. Eliminates heat generation from braking resistors, reduces cabinet cooling load and fire risk
2. High power factor and low harmonic, meets industrial grid power quality standards without additional filter
3. Energy saving rate up to 15–30% for high-frequency reciprocating motion equipment
4. Parallel expandable architecture, flexible power capacity matching multi-axis system scale
5. Stable DC bus voltage eliminates drive overvoltage fault under heavy regenerative load

Applicable Industries

Installation Requirements

1. Vertical cabinet mounting only, install at the top of electrical control cabinet for natural hot air outflow
2. Top clearance ≥100mm, bottom clearance ≥80mm for cooling air circulation
3. Separate power cable routing from signal control wiring, maintain ≥30cm distance
4. Earth wire cross-section ≥6mm² copper conductor
5. Mounting plate thickness ≥3mm steel plate, flatness tolerance ≤0.2mm

Usage Precautions

1. Grid input must install three-phase circuit breaker with matched rated current
2. Do not disconnect DC bus wiring while PRD remains energized
3. After power cut, wait minimum 20 minutes for internal high-voltage capacitor complete discharge before maintenance
4. Clean cooling fan and heat sink dust every 2 months in dusty workshop environments
5. Parallel module quantity limited to maximum 4 units per shared DC bus system
6. Ambient humidity must maintain 20–80% non-condensing, avoid cabinet internal water vapor condensation