CIGWELD WELDSKILL 180 - Section 12; Pcb Connectors; Inverter PCB

0-5461 12-1 PCB CONNECTORS
SERVICE MANUAL
180
SECTION 12:
PCB CONNECTORS
12.01 Inverter PCB
Art # A-13060
DC-
DC+
CN1 Header Pin Pin function Signal
1
+24V supply for cooling fan, 24V = Fan ON (also used
to supply J1/ J2 relay)
24 VDC
2
0V supply for cooling fan
0 VDC
Table 12-1 CN1 Header pin function (connects fan to Inverter PCB)
CN2 Header Pin Pin function Signal
1
Lead 1 from the normally closed contacts of the Ther-
mostat mounted to the IGBT heatsink
0 VDC
2
Lead 2 from the normally closed contacts of the Ther-
mostat mounted to the IGBT heatsink
0 VDC (closed contacts)
5 VDC (open contacts)
Table 12-2 CN2 Header pin function (connects Thermostat on IGBT heatsink to Inverter PCB)
CN3 Header Pin Pin function Signal
1
Lead 1 from the NTC thermistor mounted in the main
transformer
0 VDC (Tr.1 closed)
5 VDC (Tr.1 open)
2
Lead 2 from the NTC thermistor mounted in the main
transformer
2.5 VDC (Tr.1 closed)
5 VDC (Tr.1 open)
Table 12-3 CN3 Header pin function (connects NTC thermistor in main transformer to Inverter PCB)