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FIGURE E.2 – INPUT LINE VOLTAGE
GENERAL DESCRIPTION
The PRO-CUT 25 is an inverter based constant
current, continuous control plasma cutting power
source. The control system has a safety mechanism
to insure that the nozzle and electrode are in place
before cutting or gouging. The PRO-CUT 25 initiates
the plasma arc with a simple, yet reliable, touch start
mechanism. This system eliminates many of the prob-
lems associated with hi-frequency type start systems.
INPUT LINE VOLTAGE, AND
AUXILIARY TRANSFORMER
The single-phase input power of 115 230 Volts AC is
connected to the machine, via an input cord, to a
switch located on the front panel.
The PRO-CUT 25 Input voltage board automatically
reconnects the auxiliary and inverter connections to
configure the machine for either a low 115V AC or high
230V AC input voltage. The auxiliary transformer
develops the appropriate AC voltages to operate the
cooling fan, the control board, and the inverter board.
THEORY OF OPERATION
E-2 E-2
PRO-CUT 25
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
115/230/1/50/60 VAC
INPUT
CN1
2
1
4
3
5
6
7
8
300uH
L1
RL3
10/10W
R1
V2
V1
B
A
1A/250V
F1
RL2
RL2
RL2
AC
CP
CP
AC
L1
RL1
RL2
115VAC
230V
T1
115V
RL1
L1
15VAC
15VAC
SAFETY
+28VDC
SEC GND
OVLOAD
115/230
+12VDC
AC
CP
CP
AC
CN2
6
9
10
2
20
1516
+15Vrms
EV1
NO
COM
NC
12VDC
PS2
PS1
861793
OVLOAD
SEC GND
SAFETY
CN1
121814 1 11 4 13 7 19242123 8 1 2 3
3
22
17
V+
+12VDC
+12VDC_SW
+8V_SW
SEC GND
OVLOAD
TRANSFER SW
TRANSFER
SOL 1 DRIVER
SOL 2 DRIVER
TRIGGER
OUTPUT
V_OUT
121814 7 15 4 11 5 16101213
5
4
POT_WIPER
23
POT_CW
22
POT_CCW
24
CP
15K/3W
R1
15K/3W
R2
1500uF/250V
C2a,b
1500uF/250V
C1a,b
C12
CP
C26
IRG4BC30W
Q1a,b,c
IRG4BC30W
Q2a,b,c
SEC
PRI
T2
C13
D10
D11
240uH
Lout
SHUNT
SH-
SH+
BS1
8A
+12VDC
TRANSFER
C14
6.8k/5W
R24
WRK
NZL (2)
EL (3)
CN3
2
1
3
4
12VDC
PT
WORK CLAMP
CN1
SW1
230VAC
FN1
+
+
RL1
Display LED's
Control Board
Output Control
Air
Solenoid
1
Purge
Switch
Input
Voltage Board
Main Inverter Board
Solenoid 2