Lincoln Electric INVERTEC 270SX Service Manual page 35

INPUT BOARD VOLTAGE TEST (continued)
400VAC +/- 15%
3 Phase INPUT
J4
to fan
Use this heatsink as
SGND reference for
voltage tests
J6
TEST PROCEDURE
1. Apply 400V +/- 15% to the INVERTEC
2. Turn the machine input swith to ON position, soft start operation starts and power LED on front panel starts to
blink.
3. Verify that the green LD1, on input board is lit and that, after 5 seconds, the power LED on front panel is steady
green.This means that the input voltage is in the correct range and the capacitors precharge phase is finish.
4. Check for 564Vdc +/-15% between terminals DC BUS+ and DC BUS-.
5. Follow the below tables test to perform the voltage tests on connectors:
J1: Input/Inverter connector
Pin# Description
• +12Vdc in Lift TIG mode, stand-by condition
(no OCV, no fan), thermal and any overload
condition.
• 0,7Vdc in any stick mode during OCV
1 VREG
condition for 270SX
• 0,4Vdc in any stick mode during OCV
condition for 400SX
• For 270SX:
50A=1,4Vdc_150A=4Vdc_270A=7,2Vdc
2 DUTY CUT
• For 400SX:
50A=1,0Vdc_200A=4Vdc_400A=8Vdc
3 TA
4 -5V
• 0V=normal value
• 9,7Vdc +/- 10% = thermic activated on output
5 THD
board
6 SGND
7 Not Used
8 SDINVB
9 ICUT_CLP
• 3,6Vdc=270A for 270SX
10 I_EL
• 4Vdc=400A for 400SX
• 0V=normal value
• 9,7Vdc +/- 10% = thermic activated on inverter
11 TH1
board
12 +15V
J6: Input Board uController Programming connector – Only for Lincoln Engineering use
®
270SX or 400SX
Value (use SGND as 0V ref.)
-
-5Vdc
SGND
-
-
-
+15Vdc
3
5
2
4
1
W05X0855-1 on 270SX
W05X0855-2 on 400SX
+12Vdc switch the inverter OFF.
Output current set signal
Inverter TA signal (only for factory test)
-5V power supply generated by the input
Thermal tab on the output heat sink
Secondary GND for power supply (0V ref.)
Electrode Current feedback from HCS2
Thermostat on the inverter heat sink signal
+15V power supply generated by the input
Page 35
J3 J5
to output bd Not used
Notes
board.
-
Not used
Not used
board.
DC BUS -
DC BUS +
J1
to inverter bd
J7
not used
J2
to control bd
LD1