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The drive stopped and the display shows EPH1
All models and serial numbers
External or internal
EPH1 is an input phase loss. Verify the wiring connections on all three phases coming into the drive (R/L1-S/L2-T/L3). Measure line to line voltages to make sure they are all present and equal phase to phase. To reset the drive, cycle power. Turn off the line voltage until the display goes off. Then turn the voltage back on.