YASKAWA PGB-2K Replacement for Sigma Series Servo Drive

Product Overview

YASKAWA PGB-2K Replacement for Sigma Series Servo Drive: Smooth Transition & Legacy System Compatibility

The YASKAWA PGB-2K is a servo drive control board (PCB) designed for the YASKAWA Sigma Series servo drive platform — one of the most widely deployed motion control systems in precision manufacturing, CNC machining, packaging automation, and semiconductor handling. As original PGB-2K boards age, develop faults, or become increasingly difficult to source through OEM channels, plant engineers and maintenance teams face mounting pressure to restore servo axis functionality with minimal production downtime. This listing provides a verified replacement PGB-2K control board, fully compatible with the Sigma Series drive architecture, ready for immediate dispatch from our Xiamen warehouse.

The PGB-2K board serves as the core control and signal processing PCB within the Sigma Series servo amplifier chassis. It manages encoder feedback processing, current loop regulation, PWM gate signal generation, and communication with the host controller — typically a YASKAWA MP-series machine controller, a MOTOMAN robot controller, or a third-party PLC communicating via MECHATROLINK-II or analog ±10 V command interface. When this board fails, the entire servo axis becomes inoperative, halting production. A direct replacement PGB-2K restores full drive functionality without requiring reprogramming of the host controller, reconfiguration of the encoder interface, or rewiring of the power stage.

For facilities migrating from older Sigma-I or Sigma-II generation drives to Sigma-5 or Sigma-7 platforms, the PGB-2K replacement path offers a cost-effective interim strategy. Rather than committing to a full servo system overhaul — which would require replacing the SGDV or SGDH servo amplifier, the SGMJV or SGMGV servo motor, the encoder cable assembly, and potentially the machine controller — a verified PGB-2K board swap restores the existing axis to operational status, buying engineering teams the time needed to plan a structured, phased migration. This approach is particularly valuable in multi-axis systems where replacing a single failed board avoids cascading downtime across the entire machine.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful PGB-2K board replacement is rarely a standalone action — it takes place within a broader servo system context. In most Sigma Series installations, the PGB-2K board sits inside a SGDH-series servo amplifier, which is mounted in a control cabinet alongside a YASKAWA SGMAH or SGMPH servo motor, connected via a dedicated encoder cable and motor power cable. During board replacement, it is good practice to inspect the CN1 I/O connector wiring, the CN2 encoder connector, and the regenerative resistor connections for signs of heat damage or connector fatigue — issues that frequently accompany PCB failures in high-cycle applications.

For facilities running MECHATROLINK-II networks, the PGB-2K board replacement should be followed by a network address verification step to confirm the drive’s station address matches the host controller’s axis assignment — typically configured via the rotary switch on the SGDH front panel. If the system uses a YASKAWA JEPMC-BU2200 or similar MECHATROLINK-II bus coupler, no network reconfiguration is required after the board swap. Systems using a YASKAWA MP2300 or MP2600 machine controller can re-establish communication with the replaced drive immediately upon power-up, provided the axis parameters stored in the controller’s project file remain unchanged.

In multi-axis cabinets, the PGB-2K replacement is often performed alongside inspection of the SGDH power supply module, the 24 VDC control power rail, and the shared regenerative discharge circuit. If the cabinet also houses YASKAWA SGDV Sigma-5 drives on adjacent axes, the coexistence of Sigma-II and Sigma-5 drives on the same MECHATROLINK-II network is supported, provided each drive is assigned a unique station address. For axes that have already been migrated to Sigma-5 or Sigma-7 hardware, the SGDV or SGD7S amplifier, paired with a SGMJV or SGMGV motor, can operate on the same network segment as the legacy SGDH drive running the replaced PGB-2K board — enabling a phased, axis-by-axis migration strategy that eliminates the need for a full system shutdown.

Where the control cabinet layout requires signal isolation between the servo drive and the host PLC — particularly in older installations using relay-based I/O or long cable runs — a signal isolator module inserted on the analog command line can protect the new PGB-2K board from ground loop interference. Similarly, if the installation uses a YASKAWA JUSP-NS600 DeviceNet option card or a JUSP-NS115 PROFIBUS-DP option card mounted on the SGDH drive, these option cards are retained during the board swap and do not require reconfiguration.

Retrofit Guidance FAQ

Q: Do I need to rewire the drive after replacing the PGB-2K board?
A: No. The PGB-2K is an internal control PCB. All external wiring — motor power, encoder cable, I/O connector, and communication cable — connects to the SGDH drive chassis, not to the board itself. The board swap is performed inside the drive with the chassis wiring intact.

Q: Will I need to re-enter servo parameters after the board replacement?
A: Servo parameters (Pn-series) are stored in the drive’s EEPROM, which is located on the PGB-2K board. If the original board is completely non-functional, parameters will need to be re-entered using a YASKAWA JUSP-OP05A-1 digital operator or SigmaWin+ software via the CN3 serial port. We recommend recording all Pn parameters before the board swap as a standard precaution.

Q: Is the replacement board compatible with MECHATROLINK-II communication?
A: Yes. The MECHATROLINK-II interface is implemented on the PGB-2K board. The replacement board supports the same MECHATROLINK-II protocol version as the original, ensuring compatibility with YASKAWA MP-series controllers and third-party MECHATROLINK-II masters without firmware changes.

Q: What if my drive uses an analog ±10 V speed or torque command?
A: The analog command interface is fully supported on the replacement PGB-2K. No changes to the CN1 wiring or Pn002 mode selection are required.

Q: Can I use this board in a Sigma-5 (SGDV) or Sigma-7 (SGD7S) drive?
A: No. The PGB-2K is specific to the Sigma Series SGDH/SGDB platform. It is not interchangeable with Sigma-5 or Sigma-7 control boards, which use a different PCB architecture and connector layout.

Warranty Assurance

Every PGB-2K replacement board shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to dispatch, each board undergoes a functional inspection including visual examination for component damage, connector integrity verification, and where applicable, powered bench testing. Boards that do not pass inspection are not shipped.

In the event of a warranty claim, TOPNLMS provides a replacement board or full refund, subject to inspection of the returned unit. Our after-sales response target is within 24 hours on business days. Shipping for warranty replacements is arranged promptly to minimize your production downtime. All orders are dispatched from our Xiamen warehouse with full export documentation, and international shipping is available to most destinations worldwide.

For bulk procurement, spare parts program inquiries, or technical pre-sales questions regarding compatibility with your specific drive configuration, please contact our team directly.