Lincoln Electric POWER WAVE C300 Service Manual page 47

F-28
SWITCH BOARD TEST PROCEDURE (continued)
LED'S 5 THRU 10
LED 4
LED 1
LED 3
LED 11
LED'S 5 Thru 10
These six LED's are used to indicate a turn-on of a
chopper phase. Intensity of each LED is related to
the on-time of each of the IGBT's
LED 4
+15 Volt DC power supply for secondary control
circuits.
LED 1
+48 Volt DC auxiliary power supply indicator
LED 3
Boost IGBT drive.
LED 11
Buck IGBT drive.
TROUBLESHOOTING AND REPAIR
FiGURE F.8 – SWITCH BOARD LED's
POWER WAVE® C300
F-28