Thermal Arc 185 AC, Service Manual

Page: 18 / 122

2-4 May 22, 2006
ARCMASTER 185 ACDC 200 ACDC
2.06 Functional Block Diagrams
Figure 2-2 illustrates the functional block diagram of the 185/200ACDC-power supply.
Art: A-04949
Main
Circuit
Breaker
DC Power
Supply for
Control Circuit
Voltage Sensor
Drive Circuit
Primary
Current
Sensor
Lift Tig Mode
Output Short
Sensing Circuit
Input
Diode
Output
Diodes
Output
Inductor
Input
Power
Inrush Current
Suppresor
IGBT Inverter
Module
Thermal
Sensor
Output
Transformers
Current
Transformer
(CT-1)
Capacitor
Thermal
Sensor
Circuit
Current
Adjustment
Circuit
Reference
Adjustments &
Control Switches
Torch Control
Connection
(CON1)
Control
Transformer
(-c Config.)
+
+
–
–
Output
Voltage
Sensor
+
Trouble
Sensing
Circuit
Sequence
Control
To each control circuit
+12VDC +20VDC
+24VDC +5VDC
Coupling
Coil
Figure 2-2: 185/200ACDC Model Functional Block Diagram