Main Control Board Pc1 Test Point Values (Eff. W/Le411272) - Miller Millermatic 350P Technical Manual

Always perform pre-power troubleshooting before applying power to unit (see Section 8).

9-8. Main Control Board PC1 Test Point Values (Eff. w/LE411272)

Receptacle
RC1
RC2
RC3
Millermatic 350
PC1 Voltage Readings
Pin
1 +2 to 20.5 volts DC with respect to RC1-4
2 +24 volts DC when input voltage drops to less than 15% of highest input line with respect to
RC1-5
3 24 volts AC when switch S1 is On with respect to RC1-7
4 +2 to 20.5 volts DC to motor with respect to RC1-1
5 +24 volts DC when input voltage drops to less than 15% of highest input line with respect to RC1-2
6 +34 volts DC when gun trigger is closed, 0 volts when gun trigger is open with respect to RC1-8
7 24 volts AC to contactor W when switch S1 is On with respect to RC1-3
8 +34 volts DC when gun trigger is closed, 0 volts when gun trigger is open with respect to RC1-6
1 18 volts AC input with respect to RC2-3 or RC2-4
2 Not used
3 18.7 volts AC input with respect to RC2-1
4 18.7 volts AC input with respect to RC2-1
5 Not used
6 +1 volt DC input per 100 amps weld output with respect to RC2-10
7 −15 volts DC input with respect to RC2-10
8 +15 volts DC input with respect to RC2-10
9 Not used
10 Circuit common
11 Circuit board ground
12 25.3 volts AC input with respect to RC2-13 or RC2-14
13 25.3 volts AC input with respect to RC2-12
14 25.3 volts AC input with respect to RC2-12
1 +335 volts DC, negative side of capacitor C4
2 Not used
3 Not used
4 +335 volts DC, positive side of capacitor C4
5 Not used
6 Not used
a) Tolerance −  10% unless specified
b) Reference − to circuit common
(chassis ground) unless noted
c) Triggered − means gun trigger is
pressed
Values
TM-1327 Page 61