Lincoln Electric 718115 Spirit II 275 - Manual (Page 126)

Section 6: Maintenance &Troubleshooting Spirit II User’s Manual
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Microprocessor (DSP) Sequence of Operation
The following DSP Indicators should illuminate after primary power is applied:
 D77 3.3V Supply
 D78 1.8V Supply
 D50 ISC (Door)
 D33 Coolant Level
 D37 Arc Hold (if INOVA is being used)
 D10 RS232 T1 Out (Blinking)
 D11 CAN RXD (Dim Flashing)
 D12 CAN TXD (Dim Flashing)
The following DSP Indicators should illuminate when the OFF Button is released:
 D40 OFF Button
The following DSP Indicators should illuminate when the ON Button is activated:
 U21 Opto Motor / Solenoid
 U19 Opto Solenoid (not used)
 U26 Opto Fan
 D42 Plasma Ready
The following DSP Indicators should illuminate when a START signal is applied (begin
cut cycle):
 D36 Start
 U27 Opto Preflow
 U29 Opto Shield
 U24 Opto Surge (only over 100 amps)
 U23 Opto Contactor
 D24 PWM (Chopper ON)
 U22 Opto Pilot Arc Relay ON
 D43 PAT ON (Blinks during a START)
 U34 Opto ISC (Blinks during a START)
The following DSP Indicators should illuminate with an arc transfer:
 U31 Opto Postflow
 U28 Opto Plasma
 D41 Motion
The following LEDs should turn OFF after the Motion Indicator turns ON:
 U34 Opto ISC
 U27 Opto Preflow
 D43 PAT
When the START signal is removed, OPTO U30 (Vent) will illuminate. It will then go out
with the rest of the cut cycle indicators.