Theory of operation, Control board & mode selection, E-4 invertec® v450-pro – Lincoln Electric INVERTEC SVM199-A User Manual
Page 36
THEORY OF OPERATION
E-4
E-4
INVERTEC® V450-PRO
CONTROL BOARD & MODE
SELECTION
The control board performs the primary interfacing
functions to establish and maintain output control of the
INVERTEC® V450-PRO. Refer to Figure E.4. The
control board sends and receives digital command
information through the wire feeder receptacle and or
the RS232 connector. The software that is contained
within the control board processes and compares
these commands with the voltage and current feed-
back information it receives from the current sensor
and voltage sensing leads. The appropriate pulse
width modulation (PWM) signal (See Pulse Width
Modulation in this section) is sent to the switch board
IGBTs. In this manner, the digitally controlled high-
speed welding waveform is created.
The control board also monitors the thermostats, main
transformer primary current, and capacitor voltage,
and activates either the thermal light and/or the status
light. Dependent upon the fault situation, the control
board will either disable or reduce machine output, or
de-energize the main input contactor.
FIGURE E.4 - CONTROL BOARD & MODE SELECTION BOARD
INPUT
CONTACTOR
INPUT
RECTIFIER
R
E
C
O
N
N
E
C
T
CONTROL BOARD
RIGHT
SWITCH
BOARD
LEFT
SWITCH
BOARD
MAIN
TRANSFORMER
CURRENT
SENSOR
CHOKE
OUTPUT
TERMINAL
OUTPUT
TERMINAL
POWER
BOARD
115VAC
RECEPTACLE
P
O
W
E
R
S
W
I
T
C
H
I
N
P
U
T
B
O
A
R
D
FAN
MOTOR
AUX.
TRANS.
AUX.
TRANS.
RECTIFIER
AUX.
RECONNECT
PRIMARY
CURRENT
SENSOR
WIRE FEEDER
RECEPTACLE
RS232
CONN.
THERMOSTATS
THERMAL
LIGHT
CURRENT FEEDBACK
VOLTAGE FEEDBACK
65VDC
40VDC
CONTROL SIGNALS
PWM
DRIVE
CAPACITOR
VOLTAGE
FEEDBACK
CAPACITOR
VOLTAGE
FEEDBACK
PWM
DRIVE
VOLTAGE
SENSE
RECEPTACLE
#1
#2
S
W
I
T
C
H
STATUS
MODE BOARD OR
ADVANCED MODE
BOARD
LIGHT
INPUT
CONTACTOR
INPUT
RECTIFIER
R
E
C
O
N
N
E
C
T
CONTROL BOARD
RIGHT
SWITCH
BOARD
LEFT
SWITCH
BOARD
MAIN
TRANSFORMER
CURRENT
SENSOR
CHOKE
OUTPUT
TERMINAL
OUTPUT
TERMINAL
POWER
BOARD
115VAC
RECEPTACLE
P
O
W
E
R
S
W
I
T
C
H
I
N
P
U
T
B
O
A
R
D
FAN
MOTOR
AUX.
TRANS.
AUX.
TRANS.
RECTIFIER
AUX.
RECONNECT
PRIMARY
CURRENT
SENSOR
WIRE FEEDER
RECEPTACLE
RS232
CONN.
THERMOSTATS
THERMAL
LIGHT
CURRENT FEEDBACK
VOLTAGE FEEDBACK
65VDC
40VDC
CONTROL SIGNALS
PWM
DRIVE
CAPACITOR
VOLTAGE
FEEDBACK
CAPACITOR
VOLTAGE
FEEDBACK
PWM
DRIVE
VOLTAGE
SENSE
RECEPTACLE
#1
#2
S
W
I
T
C
H
STATUS
MODE BOARD OR
ADVANCED MODE
BOARD
LIGHT
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion