Lincoln Electric POWER WAVE SVM173-A Service Manual page 79

F-33
INPUT BOARD FUNCTION TEST(CONTINUED)
TEST POINTS
PLUG J61 PIN 8 (H1D)
TO
PLUG J61 PIN 6 (612)
PLUG J60 PIN 3 (238)
TO
PLUG J60 PIN 4 (604)
PLUG J61 PIN 10 (T3)
TO
PLUG J61 PIN 2 (T1)
PLUG J60 PIN 3 (238)
TO
PLUG J60 PIN 5 (232)
TROUBLESHOOTING & REPAIR
TABLE F.4 – INPUT BOARD VOLTAGE CHECKS
LEAD
NUMBERS
J61
#612
H1D
J60
#604
#238
J61
T1
T3
J60
#238
#232
POWER WAVE 455M/MSTT
EXPECTED
VOLTAGE
READINGS
SAME AS Present when Input
INPUT Switch SW1 is closed.
VOLTAGE If not, check input lines and line
switch and wiring.
This is the Coil Voltage for the
Pre-Charge Relay. Normally this
13 – 15 VDC 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.
This is Pre-Charge Voltage and
will normally be present 6 sec-
onds after activating Input Switch
SW1. The Pre-Charge Voltage
A LITTLE LESS
should remain for approximately 6
THAN INPUT
seconds and then be removed. It
VOLTAGE
should start at zero and ramp up
to 170 - 200 V.A.C. If zero volts -
check input board resistors, and
check for a shorted main input
rectifier.
This is the DC Coil Voltage for the
Control Relay. Normally this DC
Voltage will be present approxi-
13 – 15 VDC
mately 12 seconds after Input
Switch SW1 is activated. The
Relay is controlled by the Control
PC Board. See the Wiring
Diagram. Voltage will not be
applied if capacitor precharge is
incorrect.
F-33
COMMENTS