Lincoln Electric VANTAGE 400 Service Manual page 110

F-62
CHOPPER MODULE FUNCTION TEST (CONTINUED)
HL W6
HL W4
TEST PROCEDURE
1. Perform the
Procedure.
2. Make sure that there is nothing plugged into
either of the Amphenol receptacles.
3. Place idle switch in the "HIGH" position.
4. Place the mode switch in the "CC-STICK" posi-
tion.
5. Place the Welding Terminal switch in the
"REMOTELY CONTROLLED" position.
6. Start the engine and allow it to stabilize at high
idle RPM.
7. Check for 80 to 100 VDC at terminals B1- to
B2+ and B4- to B5+ of the chopper module.
See wiring diagram and figure #1.
8. If the correct DC voltage is not present at ter-
minals B1- to B2+ and B4- to B5+, check for
damaged conductors or faulty connections
between the chopper module, the output recti-
fier, and the stator weld winding. See Figure
F.17. See the wiring diagram. Perform the
Stator Voltage Tests, and the Output
Rectifier Test.
TROUBLESHOOTING & REPAIR
FIGURE F.16 - CHOPPER MODULE CONNECTIONS
25
LED1 (B1,B2,B3)
Chopper Working
L12683-1
B1
LED1 LED1
LED2 LED2
B2
B3
LED2
Voltage from
HL W9
Rectifier
SL302
SL301
Case Cover Removal
VANTAGE® 400
23
LED4
PWM Signal
B8
B4
LED4 LED4
B5
LED3 LED3
B6
LED3 (B4,B5,B6)
Chopper Working
SL13
SL14
9. If the correct voltage is present at terminals
B1- to B2+ and B4- to B5+ of the chopper mod-
ule, check for DC voltage at the chopper mod-
ule terminals B2+ to B3-, and B5+ to B6-, If sig-
nificant voltage is present, disconnect leads
#23 and #25 from the chopper module PC
board. If voltage is still present, the copper
module is shorted and should be replaced.
10. If the voltage drops to 0 VDC after the #23 and
#25 leads have been disconnected, the control
PC board is driving the chopper module when
it should not be doing so. Reconnect the #23
and #25 leads and perform the Weld Control
Board Gate Drive Test.
11. Reconnect leads #23 and #25, and place the
Welding Terminal switch in the "WELD TERMI-
NALS ON" position.
12. Check for about 58 VDC between Chopper
Module Terminals B2+ to B3-, and B5+ to B6
and between the welder output terminals. See
Figure F.16. See the wiring diagram.
HL W11
HL W5
HL W8
F-62