E-26Â Internal CPU Signal Error fault in Toshiba drive
E-26 Internal CPU Signal Error fault in Toshiba drive
Description E-26 is a deep internal fault relating to the communication between the Main CPU and the DSP (Digital Signal Processor) that controls the motor waveform. The Main CPU handles the display and logic; the DSP handles the high-speed math for the IGBT switching. E-26 means the Main CPU has lost contact with the DSP motor controller engine. Causes
1. Internal Ribbon Cable: In larger modular drives, the DSP is often on a separate board. The cable connecting them may be loose.
2. Crystal Oscillator Failure: The timing clock (quartz crystal) on the board has stopped beating, causing the two processors to lose sync.
3. Temperature: Extreme heat has caused a thermal shutdown of the DSP core while the Main CPU is still running. Solution This is a board-level failure.
1. Check the heatsink temperature. If the drive is extremely hot, let it cool down and power cycle. Thermal expansion can cause temporary BGA (chip connection) failures.
2. Reseat all internal board-to-board connectors.
3. If the fault persists, the Control Board is defective. There are no user parameters to bypass the DSP check.
Description E-26 is a deep internal fault relating to the communication between the Main CPU and the DSP (Digital Signal Processor) that controls the motor waveform. The Main CPU handles the display and logic; the DSP handles the high-speed math for the IGBT switching. E-26 means the Main CPU has lost contact with the DSP motor controller engine. Causes
1. Internal Ribbon Cable: In larger modular drives, the DSP is often on a separate board. The cable connecting them may be loose.
2. Crystal Oscillator Failure: The timing clock (quartz crystal) on the board has stopped beating, causing the two processors to lose sync.
3. Temperature: Extreme heat has caused a thermal shutdown of the DSP core while the Main CPU is still running. Solution This is a board-level failure.
1. Check the heatsink temperature. If the drive is extremely hot, let it cool down and power cycle. Thermal expansion can cause temporary BGA (chip connection) failures.
2. Reseat all internal board-to-board connectors.
3. If the fault persists, the Control Board is defective. There are no user parameters to bypass the DSP check.
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