Miller Millermatic 350P Technical Manual page 58

Always perform pre-power troubleshooting before applying power to unit (see Section 8).
9-3. Troubleshooting Circuit Diagram For 200/230/460/575 V Models (Continued)
Voltage Readings
a) Tolerance −  10% unless specified
b) Reference − to circuit common
(chassis ground) unless noted
V1 24 volts AC with switch S1 in
On position
V2 +34 volts DC when gun
trigger is closed, 0 volts when
gun trigger is open
V3 approximately +2 to +20.5
volts DC from min to max of
IPM command signal with
gun trigger closed
V4 +1 volt DC per 100 amps of
command signal with respect
to RC2-10
V5 −15 volts DC with respect to
RC2-10
V6 +15 volts DC with respect to
RC2-10
V7 approximately +2.5 to 22
volts DC from min to max of
IPM command signal with
gun trigger closed when
optional gun is attached to
unit (see Section 4-4 or 4-5)
V8 +76 to +90 volts DC
open-circuit voltage
V9 +24 volts DC when
fan-on-demand circuit is on;
0 volts when circuit is off
TM-1327 Page 54
Resistance Values
a) Tolerance − 10% unless specified

b) Turn Off unit and disconnect input
power before checking resistance
R1 30k ohms at 25 C
R2 30k ohms at 25 C
Millermatic 350