Tweco 300 ACDC Arcmaster - Manual (Page 19)

13
2.02 Functional Block Diagram
Figure 2 illustrates the functional block diagram of the 300 AC/DC-power supply.
Main
Circuit
Switch
Filter
Input
Diode
Primary
Capacitor
DC Power
Voltage
Sensor
IGBT
Inverter
Thermal
Detector
To each control circuit
+/-15VDC +18VDC
+24VDC +5VDC
Troublel
Sensing
Circuit
Drive
Circuit
Torch Control
Connection
(CON1)
circuit
Current
Adjustment
Reference
Adjustment &
Mode select Switches
Panel Circuit Board
Sequence
Control
Themal
Sensor
Circuit
Main
Transformer
(PCB14)
Output
Diodes
HF-UNIT
Control
Circuit
Stick Mode
VRD
Sensing
Circuit
Lift T ig Mode
Output Short
Sensing
Circuit
Coupling
High
Coil
Frequency
Unit
Fan Control
Circuit
Gas Control
Circuit
Fan
Solenoid
Hall Current
Transformer
(HCT1)
Output
Inductor
Thermal
Detector
+
-
+ -
Input
Power
Secandary
DC Power
Voltage Sensor
To each control circuit
+/-12VDC +15VDC
Secondary
IGBT
Inverter
Drive
Circuit
Primary
Current
Sensor
Figure 2-2. 300 AC/DC Model Functional Block Diagram
2.03 Transporting Methods
This unit is equipped with a handle for carrying purposes.
WARNING 1
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.
WARNING 2
FALLING EQUIPMENT can cause serious personal injury and equipment damage.
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.