Yaskawa CSTR-COB02AA – Converter Power Supply Board | Varispeed Series AC Drive Platform
When a converter power supply board fails inside a Yaskawa AC drive, the consequences extend far beyond a single machine. Production lines halt, servo axes lose synchronization, and maintenance teams face mounting pressure to restore operation—often within hours. In high-throughput manufacturing environments, every minute of unplanned downtime translates directly into lost output and escalating repair costs. The Yaskawa CSTR-COB02AA is the OEM-specified converter power supply board engineered to restore full drive functionality with zero compromise on electrical performance.
The CSTR-COB02AA occupies a critical position within the Yaskawa Varispeed series drive architecture. As the primary AC-to-DC conversion stage, it conditions incoming three-phase mains power into stable DC bus voltage that feeds the inverter section and gate drive circuits. Its design reflects Yaskawa’s decades of power electronics expertise, making it a trusted replacement component for maintenance engineers and repair facilities operating Varispeed-platform drives across global industrial installations.
Complete Technical Specifications
- Part Number: CSTR-COB02AA
- Manufacturer: Yaskawa Electric Corporation
- Series / Platform: Varispeed Series AC Drive
- Function: Converter Power Supply Board (AC-DC Conversion Stage)
- Board Type: PCB Assembly – Converter / Rectifier Power Supply
- Compatible Drive Family: Yaskawa Varispeed series (confirm specific frame size with your drive nameplate)
- Weight: Approx. 380 g
- Condition: New OEM / Refurbished OEM available – specify at inquiry
Note: Electrical parameters (input voltage range, output DC bus voltage, current rating) are drive-frame specific. Please provide your drive model number when submitting an inquiry to ensure full compatibility verification.
Proven Application Environments
- Automotive Manufacturing: Body-in-white welding lines, transfer press drives, conveyor indexing systems
- Metals & Steel Processing: Rolling mill main drives, coiler/uncoiler tension control
- Pulp & Paper: Winder section drives, refiner motor control
- Chemical & Petrochemical: Pump and compressor variable-speed drives in hazardous-area installations
- Food & Beverage: Mixer, extruder, and conveyor drive systems requiring precise speed regulation
- HVAC & Building Systems: Large AHU fan drives and chiller compressor control
- Marine & Offshore: Thruster and winch drive systems using Varispeed platform drives
Engineering Advantages
- OEM-Matched Design: Identical circuit topology and component specification to the original factory board—no derating or performance compromise
- Stable DC Bus Output: Precision rectification and filtering ensure low ripple DC bus voltage, protecting downstream IGBT modules and gate drivers
- Thermal Reliability: Component selection and PCB layout optimized for continuous-duty industrial thermal cycling
- Drop-In Replacement: Identical connector pinout and mounting footprint—no wiring modifications required
- Reduced MTTR: Board-level replacement restores drive operation faster than full drive replacement, minimizing mean time to repair
- Globally Sourced OEM Stock: Konmask.com maintains access to verified OEM and refurbished inventory for rapid fulfillment
System Architecture & Signal Flow
Within the Varispeed drive power stack, the CSTR-COB02AA performs the following functional sequence:
- Input Stage: Receives three-phase AC mains (typically 380–480 V AC) via the drive’s input terminals and EMC filter
- Rectification: Six-pulse diode bridge or controlled thyristor bridge converts AC to pulsating DC
- Filtering & Smoothing: DC bus capacitor bank (located on main capacitor board) smooths rectified output; the CSTR-COB02AA provides the switching and control signals for pre-charge and soft-start circuits
- DC Bus Distribution: Conditioned DC bus feeds the inverter IGBT module board and auxiliary SMPS for control card power
- Protection Signaling: Board interfaces with the drive’s main control PCB for overvoltage, undervoltage, and inrush current fault detection
Compatible & Related Parts: IGBT module board, gate driver board, main control PCB, DC bus capacitor assembly, braking resistor unit — all available through Konmask.com for complete drive restoration.
Sourcing & Quality Verification
- All boards are sourced from verified OEM channels or certified refurbishment facilities
- Each unit undergoes visual inspection for PCB damage, component integrity, and connector condition prior to shipment
- Refurbished units are load-tested on compatible drive frames before dispatch
- Traceability documentation available upon request for MRO and regulated-industry procurement
- Export packaging with anti-static shielding, foam cushioning, and moisture barrier for international freight
Procurement Process
- Submit Inquiry: Contact us via the form on this page or email [email protected] with your drive model, serial number, and required quantity
- Compatibility Confirmation: Our technical team verifies part fitment against your specific drive frame and firmware revision
- Quotation: Receive a formal quotation with lead time, condition (new/refurbished), and shipping options within 24 business hours
- Order Confirmation: Approve the quotation; we issue a proforma invoice for payment processing
- Shipment & Tracking: Parts dispatched via DHL / FedEx / UPS with full tracking; export documentation included
- After-Sales Support: Technical assistance available post-installation for commissioning questions
Technical FAQ
Q: How do I confirm the CSTR-COB02AA is the correct board for my drive?
A: Locate the drive model number on the nameplate (typically on the side panel). Share this with our team and we will cross-reference against Yaskawa’s parts matrix to confirm compatibility before you order.
Q: What is the difference between a new OEM and a refurbished unit?
A: New OEM units are unused factory stock. Refurbished units are original Yaskawa boards that have been inspected, faulty components replaced, and load-tested. Both carry our quality guarantee; refurbished units offer a cost-effective option for budget-sensitive MRO programs.
Q: Can this board be repaired at component level rather than replaced?
A: Component-level repair is possible for experienced power electronics technicians. However, board-level replacement is recommended for production-critical applications where downtime cost exceeds repair cost. Contact us if you require repair service referrals.
Q: What warranty is provided?
A: Warranty terms are specified per order based on unit condition and application. Please request warranty details in your inquiry.
Q: Do you provide export documentation for customs clearance?
A: Yes. We provide commercial invoice, packing list, and certificate of origin. HS code classification is the responsibility of the importer; our team can provide product descriptions to assist your customs broker.
Why Choose Konmask.com?
- Specialized in industrial automation components — PLC, DCS, servo, and AC drive repair parts
- Direct access to OEM and verified aftermarket inventory for Yaskawa, Siemens, ABB, Fanuc, and more
- Technical team with hands-on drive commissioning and repair experience
- Fast global shipping with full export compliance support
- Trusted by MRO teams, OEM service centers, and system integrators across 40+ countries
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