Lincoln Electric INVERTEC 270SX Service Manual page 40

OUTPUT BOARD VOLTAGE TEST (continued)
J33
to input bd
TEST PROCEDURE
1. Apply 400V +/- 15% to the INVERTEC
2. Turn the machine input swith to ON position, and wait till the power LED on front panel is stady green.
3. Follow the below tables test to perform the voltage tests on connectors and Static Switch IGBT:
J33: Output/Input connector
Pin# Description
• 3,9Vdc in any stick modes
1 V_OUT ref
• 0Vdc in Lift Tig mode
2 SW_CTRL
3 -5V
• 3,6Vdc=270A for 270SX
4 I_EL
5 SGND
6 Not Used
7 /TR
8 /PIP
9 ARCINITIATED
• 0V=normal value
• 9,7Vdc +/- 10% = thermic activated on
10 THD
output board
11 +15V
12 VREG-NOZ
for INVERTEC
®
270SX
Idle Value/Ref
-
-5Vdc
SGND
-
+15Vdc
-
Page 40
®
270SX
Notes
Only in stick modes Stand-by condition during
OCV
Not Used
-5V power supply generated by the input board
Electrode Current feedback from HCS2
Secondary GND for power supply (0V ref.)
-
Not Used
Not Used
Not Used
Thermal tab on the output heat sink
+15V power supply generated by the input board
Passer-by signal
HCS1Current
Workpiece Hall
Sensor
Transducer