Miller Electric SYNCROWAVE 250 Technical Manual page 31

See Figure 10-1 for
HD1 location
V25
V22
V21
V18
V19
See Section 6-8
for ammeter A1
calibration
Syncrowave 250
Test Equipment Needed:
No calibration available
for voltmeter V1
V24
R3
R2
A A
A
A
V20
See Section 6-3
Sections 6-4 and 6-5
for waveform A
CR5 energizes when
contactor is on
R1
V23, B,
R1
C, D, E
See Section 6-3
for waveforms
B, C, D, E
CR1 energizes
when open-circuit voltage
is present; denergizes
when an
arc is struck
See also
for PC1 data
a) Tolerance – 10% unless specified
b) Turn Off unit and disconnect input
power before checking resistance
R1
R2
R3
Voltage Readings
a) Tolerance – 10% unless
specified
b) Reference – to circuit
common (lead 42) unless
noted
c) Wiring Diagram –
Section 10
V1 230 volts ac
V2 77 volts ac
V3 82.5 volts ac
V4 57 volts ac
V5, V6 115 volts ac
V7 24 volts ac
V8, V9 18 volts ac
V10 10 volts ac
V11 80 volts dc
V12. V13, V14 115 volts ac
V15, V16, V17 24 volts ac
V18 115 volts ac with S2
in Start or Con-
tinuous
V19 0 to +10 volts dc
with contactor on
V20, V21 24 volts dc
V22 0-80 volts dc (rec-
tified arc voltage)
V23 maximum 80 volts
ac/dc
V24 24 volts dc
V25 16.5 millivolts dc
per 1 ampere of
weld output
Resistance Values
All values for T1, Z1, and T3 are less
than 1 ohm
5.3 ohms
6.1 K ohms
SC-188 161
TM-353 Page 27
see