E-38Â Remote Keypad Communication fault in Toshiba drive
E-38 Remote Keypad Communication fault in Toshiba drive
Description Specific to the newer generation drives (AS3, S15) when using the RJ45 port for a remote panel. E-38 indicates a protocol error or noise corruption on the serial link to the keypad. It is less severe than "Head" (Hardware dead) but indicates the display data is unreliable. Causes
1. Cable Impedance: Using a standard ethernet patch cord instead of a shielded cable in a noisy environment.
2. Distance: Exceeding the maximum cable length (usually 3 to 5 meters).
3. Ground Loop: The remote panel is mounted on a door with a different ground potential than the drive backplate, causing current to flow through the keypad cable shield. Solution Use a dedicated shielded cable. Ground the shield at the drive end only.
Check for ground loops. Ensure the cabinet door is bonded to the main chassis with a heavy ground strap.
If the fault is intermittent (only when motor runs), it is EMI noise. Route the keypad cable in a separate conduit/duct from the motor leads. Add a ferrite bead to the keypad cable.
Description Specific to the newer generation drives (AS3, S15) when using the RJ45 port for a remote panel. E-38 indicates a protocol error or noise corruption on the serial link to the keypad. It is less severe than "Head" (Hardware dead) but indicates the display data is unreliable. Causes
1. Cable Impedance: Using a standard ethernet patch cord instead of a shielded cable in a noisy environment.
2. Distance: Exceeding the maximum cable length (usually 3 to 5 meters).
3. Ground Loop: The remote panel is mounted on a door with a different ground potential than the drive backplate, causing current to flow through the keypad cable shield. Solution Use a dedicated shielded cable. Ground the shield at the drive end only.
Check for ground loops. Ensure the cabinet door is bonded to the main chassis with a heavy ground strap.
If the fault is intermittent (only when motor runs), it is EMI noise. Route the keypad cable in a separate conduit/duct from the motor leads. Add a ferrite bead to the keypad cable.
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