E-18Â Analog input Circuit Failure fault in Toshiba drive
E-18 Analog Input Circuit Failure fault in Toshiba drive
Description While "Loss of AI" (Part 2) indicates a broken wire in the field, E-18 indicates that the analog input circuitry *inside* the drive has failed self-diagnosis. The drive continuously monitors its internal A/D (Analog to Digital) converter. If the converter freezes or reports impossible values (like voltage higher than the internal rail supply), it trips E-18. Causes
1. Overvoltage on Input: Someone accidentally connected 120VAC or 24VDC to the 10V analog input terminal (VI/II), frying the input chip.
2. Static Discharge: Technician touched the terminal block without grounding themselves, sending ESD into the processor.
3. Board Failure: Natural component aging of the A/D converter. Solution Disconnect all wires from the analog control terminals (CC, VI, II, RR, PP). Cycle power to the drive. If E-18 remains on the screen with no wires attached, the control board is physically damaged.
If the fault clears when wires are removed, check your external wiring. You likely have a short where a higher voltage (like a 24V digital signal) is touching the analog line.
Workaround: If only the VI (Voltage) input is dead but the II (Current) input works (and the fault clears), you can sometimes reprogram the drive to use the surviving input and ignore the dead one, but usually, E-18 shuts down the whole drive requiring board replacement.
Description While "Loss of AI" (Part 2) indicates a broken wire in the field, E-18 indicates that the analog input circuitry *inside* the drive has failed self-diagnosis. The drive continuously monitors its internal A/D (Analog to Digital) converter. If the converter freezes or reports impossible values (like voltage higher than the internal rail supply), it trips E-18. Causes
1. Overvoltage on Input: Someone accidentally connected 120VAC or 24VDC to the 10V analog input terminal (VI/II), frying the input chip.
2. Static Discharge: Technician touched the terminal block without grounding themselves, sending ESD into the processor.
3. Board Failure: Natural component aging of the A/D converter. Solution Disconnect all wires from the analog control terminals (CC, VI, II, RR, PP). Cycle power to the drive. If E-18 remains on the screen with no wires attached, the control board is physically damaged.
If the fault clears when wires are removed, check your external wiring. You likely have a short where a higher voltage (like a 24V digital signal) is touching the analog line.
Workaround: If only the VI (Voltage) input is dead but the II (Current) input works (and the fault clears), you can sometimes reprogram the drive to use the surviving input and ignore the dead one, but usually, E-18 shuts down the whole drive requiring board replacement.
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