E-04Â CPU Arithmetic / Residual Error fault in Toshiba drive
E-04 CPU Arithmetic / Residual Error fault in Toshiba drive
Description E-04 is a processor logic error. The drive's Central Processing Unit (CPU) continuously performs mathematical calculations to determine voltage vectors and monitor faults. E-04 means the CPU encountered a calculation result that is impossible or undefined (like dividing by zero, or a buffer overflow). This causes the processor to "panic" and halt operations to prevent unpredictable motor behavior. Causes
1. Electromagnetic Interference (EMI): High-frequency noise enters the control board and flips a bit in the processor's register, corrupting the math.
2. Firmware Bug: A rare glitch in the drive's operating software, sometimes triggered by a specific combination of parameters.
3. Memory Corruption: The RAM used for temporary calculations has a bad sector.
4. Grounding: Poor grounding of the control board or chassis. Solution Perform a hard reset. Power down the drive and let the capacitors fully discharge (display off). Power back up. If the fault clears, it was likely a transient noise event.
Inspect the grounding. Ensure the drive chassis is bonded to earth ground. Ensure the control wires are shielded and not running parallel to the motor output cables. If the environment is electrically noisy (e.g., arc welders nearby), install ferrite cores on the control cables.
If E-04 persists immediately on boot, or occurs at the exact same point in a machine cycle every time, perform a "Type 3" Factory Reset (Initialize). Corrupt parameter data can sometimes force the CPU into an arithmetic error. If a factory reset doesn't fix it, the Control PCB is defective.
Description E-04 is a processor logic error. The drive's Central Processing Unit (CPU) continuously performs mathematical calculations to determine voltage vectors and monitor faults. E-04 means the CPU encountered a calculation result that is impossible or undefined (like dividing by zero, or a buffer overflow). This causes the processor to "panic" and halt operations to prevent unpredictable motor behavior. Causes
1. Electromagnetic Interference (EMI): High-frequency noise enters the control board and flips a bit in the processor's register, corrupting the math.
2. Firmware Bug: A rare glitch in the drive's operating software, sometimes triggered by a specific combination of parameters.
3. Memory Corruption: The RAM used for temporary calculations has a bad sector.
4. Grounding: Poor grounding of the control board or chassis. Solution Perform a hard reset. Power down the drive and let the capacitors fully discharge (display off). Power back up. If the fault clears, it was likely a transient noise event.
Inspect the grounding. Ensure the drive chassis is bonded to earth ground. Ensure the control wires are shielded and not running parallel to the motor output cables. If the environment is electrically noisy (e.g., arc welders nearby), install ferrite cores on the control cables.
If E-04 persists immediately on boot, or occurs at the exact same point in a machine cycle every time, perform a "Type 3" Factory Reset (Initialize). Corrupt parameter data can sometimes force the CPU into an arithmetic error. If a factory reset doesn't fix it, the Control PCB is defective.
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