Power Supply Microprocessor (Dsp) Sequence Of Operation - Lincoln Electric SPIRIT II 275 Technical Manual

Section 6: Maintenance &Troubleshooting
Power Supply 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 ................................... ASC (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:
 Opto U21 .......................... Motor / Solenoid
 Opto U19 .......................... Solenoid (not used)
 Opto U26 .......................... Fan
 D42 ................................... Plasma Ready
The following DSP Indicators should illuminate when a START signal is applied (begin
cut cycle):
 D36 ................................... Start
 Opto U27 .......................... Preflow
 Opto U29 .......................... Shield
 Opto U24 .......................... Surge (only over 100 amps)
 Opto U23 .......................... Contactor
 D24 ................................... PWM (Chopper ON)
 Opto U22 .......................... Pilot Arc Relay ON
 D43 ................................... PAT ON (Blinks during a START)
 Opto U36/U37 ................... Impulse/RHF (Blinks during a START)
The following DSP Indicators should illuminate with an arc transfer:
 Opto U31 .......................... Postflow
 Opto U28 .......................... Plasma
 D41 ................................... Motion
The following LEDs should turn OFF after the Motion Indicator turns ON:
 Opto U36/U37 ................... Impulse/RHF
 Opto U27 .......................... 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.
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Spirit II User's Manual