Lincoln Electric POWER WAVE SVM156-A Service Manual page 75

F-29
TEST POINTS
PLUG J61 PIN 8 (H1D)
TO
PLUG J61 PIN 2 (612)
PLUG J61 PIN 10 (T3)
TO
PLUG J61 PIN 2 (T1)
PLUG J60 PIN 3 (238)
TO
PLUG J60 PIN 4 (604)
PLUG J60 PIN 3 (238)
TO
PLUG J60 PIN 5 (232)
TROUBLESHOOTING & REPAIR
INPUT BOARD TEST(CONTINUED)
TABLE F.5 – INPUT BOARD VOLTAGE CHECKS
LEAD
NUMBERS
J61
#612
H1D
J61
T1
T3
J60
#238 #604
J60
#238
#232
POWER WAVE 455/R
EXPECTED
VOLTAGE
READINGS
SAME AS Present when Input
INPUT Switch SW1 is closed.
VOLTAGE
A LITTLE LESS This is Pre-Charge Voltage and
THAN INPUT will normally be present 6 sec-
VOLTAGE onds after activating Input Switch
SW1. The Pre-Charge Voltage
should remain for approximately 6
seconds and then be removed.
13 – 15 VDC This is the Coil Voltage for the
Pre-Charge Relay. Normally this
DC Voltage will be present 6 sec-
onds after Input Switch SW1 is
activated. This 13 - 15 VDC will
remain for approximately 6 sec-
onds and then be removed. The
Relay is controlled by the Control
Board. See the Wiring Diagram.
13 – 15 VDC This is the DC Coil Voltage for the
Control Relay. Normally this DC
Voltage will be present approxi-
mately 12 seconds after Input
Switch SW1 is activated. The
Relay is controlled by the Control
PC Board. See the Wiring
Diagram.
F-29
COMMENTS