Input power, switch, control transformer, DC24V fan supply and main control board X16.
Model reference
LGK60L Plasma Cutter Board Stack and Fault Route Reference
Structured service reference for LGK60L plasma cutters, connecting front-panel symptoms to board stack, DC24V control, HF arc-start and cutting-current evidence.
Quick Answer
LGK60L is useful as a plasma-cutter foundation model because the source separates the front controls, control board, top board, middle board, bottom board and HF arc-start board into distinct service layers.
- Start from the visible fault: fan, O.C light, gas, HF, no arc, unstable current or weak current.
- Separate the DC24V control layer from the high-frequency arc-start layer and the main cutting-current path.
- Use board names and connectors as navigation clues rather than treating the whole machine as one replaceable board.
Board stack and service layers
Main control board PK-05-B4-EPhase-loss protection, O.C indication, cutting potentiometer, feedback, DC24V output, drive output and temperature relay interface.
Top board PM-03-A1-BDrive signal input, overcurrent detection, main-transformer socket and power-stage interface.
Middle board PD-17-A1-AMain transformer input, positive and negative output, current feedback, HF arc-start and rectifier bridge layer.
Bottom board PZ-01-A6-APower-voltage input, control transformer power, main power output, phase-loss protection and DC24V input.
HF arc-start board PH-18-A1-CGas-valve socket, torch switch, high-frequency supply, HF arc-start and arc-start cutoff.
External service partsSolenoid valve, reactor, cooling fan, torch socket, switch socket and output terminals.
LGK60L repair routing map
Start from the symptom and move to the relevant board layer.
Temperature relay, phase-loss protection, X13/X15 split and main control board decision.
Torch switch, gas-valve socket, solenoid valve and HF board control input.
HF supply, arc-start board, start cutoff and transfer behavior after arc ignition.
Gas, HF, current feedback, output stage, work return and torch consumables.