Red-D-Arc D502K 5+4, Technical Manual

Page: 46 / 82

TM-4412 Page 42
D502K 5+4
10-3. Troubleshooting Values For Circuit Diagram (Use With Section 10-2)
Test Equipment Needed:
Voltage Readings
a) Tolerance –
±
10% unless specified
b) Condition – 70
°
F (21
°
C); cold
machine (no warm-up); no load
c) Reference – single arrow: reference
to circuit common (lead 42); double
arrow: reference to points indicated
d) Process/Contactor Control switch S6
in Weld Terminals Always On – CC
Stick position unless noted
e) Wiring Connections – see Section 12
V1 126 – 130 volts ac
V2 126 – 130 volts ac
V3 252 – 260 volts ac
V4 27 volts ac
V5 101 volts ac
V6 175 volts ac
V7 +135 volts dc
V8 + 89 volts dc
V9 +89 volts dc (S6 in Weld Terminals Always
On –Stick position)
+33 volts dc (S6 in Weld Terminals Always
On–Scratch Start TIG position)
+11.5 to 40.5 volts dc from min to max of
R1 (S6 in Weld Terminals Always On –
MIG position)
V10 69 volts ac (R1 at max.)
V11 69 volts ac (R1 at max.)
V12 69 volts ac (R1 at max.)
V13 +89 volts dc (S6 in Weld Terminals Always
On – Stick position)
47 volts dc (S6 in Weld Terminals Always
On – Scratch Start Tig position)
+16 to 56 volts dc from min to max of R1
(S6 in Weld Terminals Always On – MIG
position)
V14, +12 volts dc with Start/Preheat switch S1 in
V15, Preheat position
V16
V17 0 to +10 volts dc from min to max of R1
V18 +12 volts dc
V19 0 to +10 volts dc from min to max of R1
V20 +12 volts dc
V21 +12 volts dc
V22 258 volts ac with Process/Contactor
Controlswitch S6 in Stick position
V23, 18 volts ac with Process/Contactor
V24 Control switch S6 in Stick position
Amperage Readings
a) Tolerance –
±
5% unless specified
b) Condition – 70
°
F (21
°
C); cold
machine (no warm-up); no load
c) Process/Contactor Control
switch S6 in Weld Terminals
Always On – CC Stick position
unless noted
I1 6.3 amps dc
I2 4.3 – 4.6 amps dc
Resistance Values
a) Tolerance –
±
10% unless
specified
b) Condition – 70
°
F (21
°
C); cold
machine (no warm-up)
c) Wiring Connections – see
Section 12
d) Stop engine before checking
resistance
R1 thru R6 Less than 1 ohm
R7 18.5 ohms
R8 14.2 ohms
R9 thru R11 Less than 1 ohm
R12 15 ohms
R13 Less than 1 ohm