MANUAL 430429-490
15
OPERATOR CONTROLS
2.02 Functional Block Diagrams
Figure 2 illustrates the functional block diagram of the 400MSTW power supply.
Figure 2. 400MSTW Model functional block diagram
Main
Circuit
Breaker
Input
Diode
Inrush Current
Suppressor
Capacitor
IGBT Inv erter
Module
Thermal
Sensor
Output
Transformers
Output
Diode
Transformer
(CT-1)
Current
Coupling
Coil
+
Control
Transformer
Driv e Circuit
Voltage Sensor
DC Pow er
Supply for
Control Circuit
To each control circuit
+12VDC +20VDC
+24VDC +5VDC
Trouble
Sensing
Circuit
Sequence
Control
Reference
Adj ustments &
Control Sw itches
Torch Control
Connection
(CON1)
Current
Adj ustment
Circuit
Output
Voltage
Sensor
Primary
Current
Sensor
Thermal
Sensor
Circuit
Lift Tig Mode
Output Short
Sensing Circuit
Output
Inductor
-
-
+
+
Input
Pow er
