Lincoln Electric INVERTEC 270SX Service Manual page 36

INPUT BOARD VOLTAGE TEST (continued)
J4: Fan connector
Pin# Description
1 15 Vac in idle mode
Fan
230Vac when fan ON
2
J2: Input/Control connector
Pin# Description
1 +15V
2 SGND
3 GASERR
• 3,6Vdc=270A for 270SX
4 I_EL
• 4Vdc=400A for 400SX
5 I_WP
6 SGND
In any stick modes
7 VREG-NOZ For 270SX: 50A=1,5Vdc_270A=7,2Vdc
For 400SX: 50A=1Vdc_400A=8Vdc
8 REMSIGN
• +5Vdc only during Power Up sequence
9 READY_OK
• 0V during normal operation condition
10 SW_CTRL
• 0V=normal value
• 9,7Vdc +/- 10% = thermic activated on
11 TH1
inverter board
• For 270SX:
50A=1,4Vdc_150A=4Vdc_270A=7,2Vdc
12 DUTYCUT
• For 400SX:
50A=1,0Vdc_200A=4Vdc_400A=8Vdc
13 /PIP
14 SDINVB
15 TH2
16 /TR
17 SOL
• 0V=Fan OFF
18 FAN
• 1,6Vdc=Fan ON
19 ARCINITIATED
20 ICUT_CLP
21 BBST
22 CE/US
23 ACLOSS
24 TA
J3: Input/Output 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
• 4Vdc=400A for 400SX
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
Value Notes
Fan is switch ON by signal
coming from control board
Value (use SGND as 0V ref.)
+15Vdc
SGND
-
SGND
-
-
-
-
-
-
-
5Vdc= CE version
+5Vdc
-
Value (use SGND as 0V ref.)
-
-5Vdc
SGND
-
+15Vdc
-
+15V power supply generated by the input board
Secondary GND for power supply (0V ref.)
Not used
Electrode Current feedback from HCS2
Not used
Secondary GND for power supply (0V ref.)
In LIFT TIG mode (stand-by) = 12Vdc
Not used
If +5Vdc are present means that something not
normal is detected by the input board, like power
supply out of range.
Not used
Thermostat on the inverter heat sink signal
Output current set signal
Not used
Not used
Not used
Not used
Not used
Fan signal
Not used
Not used
Not Used
Machine version
Inverter TA signal (only for factory test)
Only in stick modes Stand-by condition during
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
Page 36
Notes
Always
Notes
OCV
-