The Toshiba SR5ISS4-G18 (identified by assembly codes 2J2B3437-A-JA02, 2P4110D, and 272B0543-4) is a high-performance industrial circuit board designed for precision motor control and power electronics applications. This board is typically found within Toshiba’s medium-voltage or high-performance low-voltage drive systems (VFDs). It serves as a critical interface for signal processing, managing the complex logic required for gate driving, feedback loops, and communication between the central processing unit and the power modules.

 

Product Datasheet & Technical Specifications

This multilayer PCB is engineered for high-speed switching and thermal stability:

• Model Number: SR5ISS4-G18
• Main Assembly Code: 2J2B3437-A-JA02
• Component ID: 2P4110D / 272B0543-4
• Function: Inverter Control / Interface Board
• Input Logic: Low-voltage DC control signals (typically 5V, 15V, or 24V)
• Application: Toshiba TOSVERT series or specialized industrial AC drives
• Mounting: Plug-in or screw-down standoffs within a drive chassis
• Isolation: Opto-isolated signal paths to protect low-voltage logic from high-power noise

Country of Origin

This control board is manufactured in Japan by Toshiba Corporation, adhering to the highest global standards for semiconductor and power electronic reliability.

 

Application Fields

The SR5ISS4-G18 is a vital component in heavy-duty power management:

• Variable Frequency Drives (VFDs): Controlling the speed and torque of large industrial motors.
• Steel Mills: Managing the high-current demands of rolling and milling machinery.
• Mining Operations: Powering conveyor systems and ventilation fans in underground environments.
• Water Treatment: Regulating high-capacity pumps for municipal distribution.
• Power Plants: Supporting excitation systems and auxiliary motor controls for turbines.

 

Product Instructions & Technical Notes

When installing or replacing the Toshiba SR5ISS4-G18, it is essential to follow strict ESD (Electrostatic Discharge) protocols, as the onboard CMOS components are highly sensitive to static. Before insertion, verify that all ribbon cables and multi-pin connectors are clean and free of oxidation. This board often contains specific firmware; ensure the hardware revision (G18) matches your existing system to prevent compatibility errors. If the drive has experienced a power module failure (IGBT explosion), it is highly recommended to check the gate driver circuits on this board for damage before reapplying power to the system.

 

Q&A – Frequently Asked Questions

Q1: What is the significance of the “G18” suffix? A: The “G18” denotes a specific hardware revision or “Grade.” This usually implies internal component updates or optimized circuit paths compared to earlier G16 or G17 versions.

Q2: Can I repair a damaged SR5ISS4 board? A: While component-level repair is possible for items like capacitors or resistors, the multilayer nature of the PCB and proprietary Toshiba chips make it more reliable to replace the board with a tested spare in critical applications.

Q3: How do I troubleshoot a “Control Board Error” on my Toshiba drive? A: Check the status LEDs on the board. A steady red “FAIL” or “ALARM” LED often indicates a DC-DC power supply failure on the board or a communication timeout with the main CPU.

Q4: Is this board compatible with all Toshiba TOSVERT drives? A: No. While it is used in several series, you must match the full assembly code (2J2B3437…) and part number to ensure the electrical and physical footprint is correct.

 

Similar Model Recommendations

1. Toshiba SR5ISS4-G16 (Earlier revision)
2. Toshiba 2J2B3437-B (Alternative assembly variant)
3. Toshiba 2P4110C (Predecessor component ID)
4. Toshiba VEC series control boards
5. Toshiba 272B0543-1 (Base PCB version)