Control Board - Lincoln Electric PRO-CUT 25 Service Manual

E-6
SW1
L1 RL3
A
300uH R1
10/10W
B
V1
L1
V2
230V
RL1
115V
L1
Input
Voltage Board
12VDC
Air
Purge
Solenoid
Switch
1

CONTROL BOARD

The control board receives status and analog
feedback signals from the inverter board, input board,
and various sensors. The control circuitry interprets
these signals, makes decisions and changes the
machines mode and output to satisfy the requirements
as defined by the circuitry. The control board sends a
signal to the inverter board to control the output
current but the actual regulation circuits are on the
inverter board.
THEORY OF OPERATION
FIGURE E.6 – CONTROL BOARD
AC
AC
RL2
CP CP
RL2
CP CP
RL2
AC AC
RL1
RL2
115VAC
T1
CN1 CN2
15VAC
1 9
15VAC
2 10
SAFETY
3 5
+28VDC
4 6
SEC GND
5 3
OVLOAD
6 22
115/230
7 2
+12VDC
8 20
15 16
8 6 17 9 3
CN1
Display LED's
PRO-CUT 25
Q1a,b,c
IRG4BC30W
C26
T2
PRI
+
R1
CP
C1a,b
C12
CP
+
R2
C2a,b
Q2a,b,c
IRG4BC30W
CN1
12 18 14 1 11 4 13 7 19 24 21 23 8 17 1 2 3
1 2 18 14 7 15 4 11 5 16 10 12 13 23 22 24
Output Control
Control Board
The display board, directly connected to the control
board, communicates PRO-CUT 25 status and
operating conditions to the user. There are four status
indicators: Power On, Gas Pressure, Thermal
Overload, and Safety Error.
Lout
D10
BS1
WRK
240uH
8A
+12VDC TRANSFER
SEC
D11
RL1 NZL (2)
C14
R24
6.8k/5W
SHUNT
EL (3)
C13
SH- SH+
CN3
1
2
3
4
Main Inverter Board
4
E-6
WORK CLAMP
PT
12VDC