Always check unit before applying power (see Sections 8-2 thru 8-11).
TM-246193 Page 63Invision 352 MPa
8-32. Front Panel/Display Board PC3 Test Point Values
PC3 Voltage Readings
a) Tolerance − ±10% unless specified
b) Reference − to circuit common
(lead 42) unless noted
Receptacle Pin Type Value
RC1 1 Output Output reference; 1 volt DC per 42.5 amperes of weld output when machine is under load; when machine
at idle, process set to MIG with .035 STL wire and ARGN CO2 gas selected; adjust control set to 10V
preset = 8.2V; adjust control set 38V preset = 9.4V
2 Output Voltage feedback; 1 volt DC per 10 volts DC of weld output
3 Input Current feedback; 1 volt DC per 100 amperes of weld output
4 Not Used
5 Output Output enable; 0 volts DC = ON, +12.5 volts DC = OFF
6 Not Used
7 Not Used
8 Not Used
9 Output Fan enable; +5 volts DC = fan on, −15 volts DC = fan off
10 Not Used
11 Input Main transformer overcurrent detect; +.7 volts DC = OK, +3.3 volts DC = T1 primary current = HELP 1
12 Not Used
13 Output +3.0 volts DC reference voltage for thermistors
14 GND Circuit common referenced to chassis
15 Input Secondary side thermistor return; +1.2 volts DC at 25
C thermistor temperature
16 GND Circuit common referenced to chassis
17 Input Primary side thermistor return; +1.2 volts DC at 25
C thermistor temperature
18 GND Circuit common referenced to chassis
19 Input Foldback; decreases weld output if input bus voltage drops, 0 volts = OK, +15 volts DC 15Khz pwm
squarewave = foldback
20 GND Circuit common referenced to chassis
21 Input +24 volts DC, unregulated DC voltage with respect to GND, power feed to front panel pcb
22 Input +24 volts DC, unregulated DC voltage with respect to GND, power feed to front panel pcb
23 Input −24 volts DC, unregulated DC voltage with respect to GND, power feed to front panel pcb
24 Input −24 volts DC, unregulated DC voltage with respect to GND, power feed to front panel pcb
RC2 1 Input Negative weld output terminal; used for output voltage feedback
2 Not Used
3 Input Positive weld output terminal; used for output voltage feedback
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