Miller Electric S-21E - Manual (Page 22)

A
WARNING: ELECTRIC SHOCK can kill; MOVING PARTS
can cause serious injury.
• Do not touch live electrical parts.
• Shut down wire feederand welding powersource or stop
engine before making or changing meter lead connec-
tions and before disconnecting or connecting any leads.
• Have only qualified persons familiar with and following
standardsafetypracticesperform troubleshootingproce-
dures.
• Follow standard ESD precautions to prevent damaging
static-sensitive parts during testing.
o to 6.5 volts dc input from
mm. to max. of WIRE SPEED
control with ~untrigger
/
+19 volts dc Input with
gun trigger preseed without
option, +24 volts dc input
with gun trigger pressed
with option, 0 volts dc input
after spot time or trigger
released
6.5 volts dc output
Not used
+24 volts dc
output
.29.1
RI & M
mwus ~e~n
+24 volts dc input
with gun trigger
pressed
TM-i 571 Page 18
Diagram 8-2. Troubleshooting Circuit Diagram For Motor Control Board PCi
S-2iE