ESAB Precision Plasmarc EPP-450 Manuel D'instructions page 38

section 6
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Fault Indicator (Front Panel)
Illuminates when there are abnormalities in the cutting process or when the input
voltage falls ±10% outside the normal value. Momentary illumination is normal. If
continuously lit, check LEDs 3, 4, 5, 7, and 8 on PCB1 for further diagnosis.
LED 3 – (yellow) Bus Ripple Fault - Momentarily illuminates at the beginning of
each cut. Continuously lit during single-phasing or imbalanced line-to-line volt-
ages of the three phase input line (Excessive Ripple). Power Source is shut down.
LED 4 – (yellow) High Bus Fault – Illuminates when input line voltage is too high
for proper operation (approximately 20% above nominal line voltage rating).
Power source is shut down.
LED 5 – (yellow) Low Bus Fault – Illuminates when input line
voltage is lower than 10% below nominal line voltage rating.
Power Source is shut down.
LED 7 – (yellow) Arc Voltage Saturation Fault – Illuminates
when the cutting arc voltage is too high and cutting current
drops below preset level. LED will extinguish after voltage
decreases and current rises.
LED 8 – (yellow) Arc Voltage Cutoff Fault – Illuminates when
arc voltage increases over the preset value. PS is shut down.
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