Hypertherm HD4070 Rev.8 - Manual (Page 169)

MAINTENANCE
5-22 HD4070 Instruction Manual
4
Plasma Interface Board PCB5- Status Indicators
J 4
J 8
T P 4
J 7
J 6
J 2
J 3
J 1
Plasma Interface PC Board LED List
LED Signal Name Function
D2 +24 Volts Power indicator, Always ON
D7 Ohmic Contact Illuminates when torch is in contact with plate
D9 Transfer Illuminates when arc transfers to plate
D10 Shield #1 Relay for THC #1. ON when circuit is closed
D12 Cooling Temp OK Coolant temperature at acceptable level, always ON
D13 Spare Input Not used
D14 +15 Volts Power indicator, Always ON
D15 Shield #2 Relay for THC #2. ON when circuit is closed
D17 Cooling Flow OK Sensor detecting good coolant flow
D18 Spare Output Not used
D20 -15 Volts Power indicator