TM-428 Page 19
Miller Legend
SC-168 053-A
Amperage Readings
a) Tolerance –
±5% unless specified
b) Condition – 70
°F (21°C); cold machine
(no warm-up); no load
I1 3
amps dc
I2
1.8 amps dc (R1 at min.)
3.1 amps dc (R1 at max.)
Voltage Readings
a) Tolerance –
±10% unless specified
b) Condition – 70
°F (21°C); cold
machine (no warm-up); no load
c) Reference – to circuit common
(lead 33) unless noted
d) Wiring Diagram – see Section 9
V1 DC/CC
OCV at weld rpm:
58 volts dc (R1 at min.)
70 volts dc (R1 at max.)
(Do not exceed 72 volts dc)
V2 AC/CC OCV
, at weld rpm:
65 volts ac (R1 at min.)
80 volts ac (R1 at max.)
(Do not exceed 80 volts ac)
V3
At RC3 at power/idle rpm:
244 volts ac
±
5% (50 or 60 Hz)
V4
At RC2 at power/idle rpm:
122 volts ac
±
5% (50 or 60 Hz)
V5
At RC1 at power/idle rpm:
122 volts ac
±
5% (50 or 60 Hz)
V6
AC input to transformer T1: 122 volts ac
(power/idle rpm), 0 volts ac (weld rpm)
V7
AC output to PC2: 21 volts ac
±5%
V8
AC output to PC2: 21 volts ac
±5%
V9
AC output from Regulator Power
Winding (power/idle rpm)
158 volts ac
±5%
V10
AC output from W
eld Winding at
weld rpm: 65 volts ac (R1 at min.), 80
volts ac (R1 at max.) (Do not exceed 80
volts ac)
V11
At rated DC weld load: At least
1 volts ac
V12
At weld rpm and 100 watt light bulb load
applied: 3 volts ac or greater
V13 Idle Lock switch S1 in Lock:
0 volts ac at all times
V14
AC output from Exciter Winding
80 volts ac (power/idle rpm)
145 volts ac (weld rpm)
V15
At RC4 at weld speed: at least 120
volts ac (Do not exceed 132 volts ac)
V16
Auxiliary power winding at weld rpm:
at least 120 volts ac (Do not exceed
132 volts ac)
V17
Auxiliary power winding at weld rpm:
at least 120 volts ac (Do not exceed
132 volts ac)
V18
Battery output whenever engine is
running: 14 volts dc.
V19
AC Alternator output:
17 volts ac (power/idle rpm)
39 volts ac (weld rpm)
V5
V4
V3
V2/C/D V1/A/B
V9/R9
V10/R8
V7/
V8/
V6/R3
R5
R4
R10
R11
R6
R7
See Sections 6-7
thru 6-9 for PC2 data
See Section 6-4 for
waveforms A thru D
See Section 5 for
PC4 information
