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ARCMASTER 300 ACDC
2.06 Functional Block Diagrams
Figure 2-2 illustrates the functional block diagram of the 300 ACDC-power supply.
Main
Input
Input
Circuit
Diode
Switch
Power
Filter
Primary
2.07 Transporting Methods
These units are equipped with a handle for carrying
purposes.
ELECTRIC SHOCK can kill. DO NOT TOUCH
live electrical parts. Disconnect input power
conductors from de-energized supply line
before moving the welding power source.
FALLING EQUIPMENT can cause serious
personal injury and equipment damage.
2-4
To each control circuit
DC Power
+/-12VDC +15VDC
Drive
Circuit
IGBT
Capacitor
Transformer
Inverter
DC Power
Thermal
Detector
Voltage
Sensor
To each control circuit
Th ermal
Drive
Sensor
+/-15VDC +18VDC
Circuit
Circuit
+24VDC +5VDC
Trouble
Sensing
Circuit
Torch Control
Connection
(CON1)
Current
Adjustment
circuit
Panel Circuit Board
Figure 2-2: 300 ACDC Model Functional Block Diagram
WARNING
WARNING
Main
Output
Output
Diodes
Inductor
(PCB14)
Thermal
Detector
HF-UNIT
Stick Mode
Control
VRD
Circuit
Sensing
Circuit
Primary
Current
Sensor
Sequence
Control
Reference
Adjustment &
Mode select Switches
• Lift unit with handle on top of case.
• Use handcart or similar device of adequate capacity.
• If using a fork lift vehicle, place and secure unit on a
proper skid before transporting.
Hall Current
Secondary
IGBT
Transformer
Inverter
(HCT1)
Coupling
Coil
Lift Tig Mode
Output Short
Sensing
Circuit
High
Frequency
Unit
Fan Control
Fan
Circuit
Gas Control
Solenoid
Circuit
Art # A-04981
February 22, 2006
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