SECTION 6 Troubleshooting
ESP 400C and 600C Plasma Power Sources
6-2
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 – (amber) Bus Ripple Fault -
Momentarily illuminates at the beginning of each
cut. Continuously lit during single-phasing or
imbalanced line-to-line voltages of the three phase
input line.(Excessive Ripple) Power Source is shut
down.
LED 4 – (amber) High Bus Fault – Illuminates
when input line voltage is too high for proper
operation (approx. 20% above nominal line voltage
rating). Power source is shut down.
LED 5 – (amber) Low Bus Fault – Illuminates
when input line voltage is approx. 20% below
nominal line voltage rating. PS is shut down.
LED 7 – (amber) 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 – (amber) Arc Voltage Cutoff Fault –
Illuminates when arc voltage increases over the
preset value. PS is shut down.
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