P-Err Input Phase Sequence fault in Toshiba drive
P-Err Input Phase Sequence Error fault in Toshiba drive
Description The P-Err fault (sometimes displayed as E-Input Rotation) indicates that the order of the incoming three-phase power lines (L1, L2, L3) does not match the expected sequence (R-S-T). For a standard VFD, input phase rotation usually doesn't matter because the AC is converted to DC immediately. However, if the drive is using a "Bypass" contactor scheme or if the "Input Phase Sequence Detection" parameter is enabled for specific grid-sync applications, this fault will prevent operation to ensure the motor doesn't spin backward when switched to grid power. Causes
1. Utility Change: The power company worked on the lines down the street and swapped two phases.
2. Wiring Error: During installation, the electrician swapped L1 and L2.
3. Generator Power: Running on a backup generator which is wired with a different rotation than the main utility. Solution This is an easy fix. First, verify if the application *requires* specific phase rotation. If you are using a Bypass (running the motor directly across the line in emergencies), rotation is critical. You must physically swap two of the incoming input wires (e.g., swap L1 and L2) at the drive's input disconnect.
If you are NOT using a bypass and the VFD is simply driving the motor directly, input rotation is irrelevant to the motor direction (the VFD determines output direction). In this case, you can simply disable the detection. Navigate to the Protection Parameters (typically F600 series) and find "Input Phase Sequence Detection." Set it to "Disable" (0). This will clear the fault without needing to rewire the high-voltage inputs.
Description The P-Err fault (sometimes displayed as E-Input Rotation) indicates that the order of the incoming three-phase power lines (L1, L2, L3) does not match the expected sequence (R-S-T). For a standard VFD, input phase rotation usually doesn't matter because the AC is converted to DC immediately. However, if the drive is using a "Bypass" contactor scheme or if the "Input Phase Sequence Detection" parameter is enabled for specific grid-sync applications, this fault will prevent operation to ensure the motor doesn't spin backward when switched to grid power. Causes
1. Utility Change: The power company worked on the lines down the street and swapped two phases.
2. Wiring Error: During installation, the electrician swapped L1 and L2.
3. Generator Power: Running on a backup generator which is wired with a different rotation than the main utility. Solution This is an easy fix. First, verify if the application *requires* specific phase rotation. If you are using a Bypass (running the motor directly across the line in emergencies), rotation is critical. You must physically swap two of the incoming input wires (e.g., swap L1 and L2) at the drive's input disconnect.
If you are NOT using a bypass and the VFD is simply driving the motor directly, input rotation is irrelevant to the motor direction (the VFD determines output direction). In this case, you can simply disable the detection. Navigate to the Protection Parameters (typically F600 series) and find "Input Phase Sequence Detection." Set it to "Disable" (0). This will clear the fault without needing to rewire the high-voltage inputs.
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