Lincoln Electric CITOTIG 315DC Service Manual page 43

INPUT BOARD VOLTAGE TEST (continued)
AC input power
supply 400V +/- 15%
J6
to Water Cooler
LD2
+5VNI
TEST PROCEDURE
Use always electrically insulate gloves during this test procedure
1. Apply 400Vac +/- 15% to the CITOTIG 315DC or 415DC
2. Turn the machine input switch 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 pre-charge
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 +/- 10% in Lift TIG mode, stand-by
1 VREG • 0,6Vdc +/- 10% in stick mode during OCV
• 0,4Vdc in stick mode during OCV condition for
• For 315DC:
2 DUTY
• For 415DC:
3 VRIF
4 -5V
• 0V= in stick mode
5 HFON-PK
• 7,5Vdc +/- 10% in LIFT and HF mode
6 SGND
• 6Vdc +/- 10% in stick mode in OCV condition
7 MIS_V
• 0,6 Vdc +/- 10% TIG modes in OCV condition
8 I_LIM
9 300/400
• 2Vdc=150A – 3,6Vdc=270A for 315DC
10 MIS_I
• 1Vdc=100A – 4Vdc=400A for 415DC
• 0V=normal value
11 TH1
• 14,5Vdc +/- 10% = thermic activated on
12 +15V
LD1
W05X1328 on 315DC (picture above)
+15Vdc
W05X1328-2 on 415DC
Value (use SGND as 0V ref.)
condition (no OCV, no fan), thermal and any
overload condition.
condition for 315DC
415DC
50A=1Vdc_150A=3Vdc_300A=6Vdc
50A=0,75Vdc_150A=2,2Vdc_400A=6Vdc
-5Vdc
SGND
Not Used
0Vdc=300A 5Vdc +/- 10% =400A
inverter board
+15Vdc
3
5
2
4
1
Notes
+12Vdc = inverter OFF
Output current set signal
-5V power supply generated by the input
board.
Signal for starting peak current in HF
(Peak visible only with oscilloscope at arc start)
Secondary GND for power supply (0V ref.)
Output voltage feedback
Not used
Control board machine identification
Output current feedback
Thermostat on the inverter heat sink signal
+15V power supply generated by the input
board.
44
DC BUS -
DC BUS +
J1
to Inverter bd
J2
to Control bd
J7
HF bd
J5
Gas
solenoid
J3 J4
to Output bd Fan