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section 6
6.10 high / low cut current modes and mark mode
A remote contact connecting 115V AC from J1-R to J1-S places the Pilot Arc in High by operating K8. Note, that for this func-
tion to operate, the Pilot Arc Hi/Lo switch on the front panel must be in the "LO" position.
The EPP-450 is placed in the Marking mode when a remote contact connecting 115V AC from J1-R to J1-C operates K11. In
the Marking mode, a normally closed contact on K11 opens turning off K10. When K10 turns off, the Boost supply is discon-
nected lowering the normal Cutting Mode 430V DC Open Circuit Voltage to 360VDC for Marking. A normally open contact
on K11 activates K12. K12 connects the I (min) resistors necessary for stabilizing the low currents required for marking. In
the Cutting mode, the minimum stable output current is 50A in the high current range, 35A in the low current range and
10A in the marking mode. In the marking mode, the normally closed contacts K11(3, 9) and K11(1, 7) open. This deactivates
HIGH/LOW CUT CURRENT MODES & MARK MODE
K13 and K14 placing the power source in the low current range.
SEE PAGE 2
PCB10 P1-2
H
115 VAC
G
PL2
3
N
1
TB8-8
TB8-7
TB1-7
Z BIAS
P5-3
P5-2
20V
D
SEC 40VCT
PRI 120V
9
6
T7
K13
9
3
K13
K11
9
6
K11
9
T3
3
PILOT ARC
LO
S1
HI/LO
5
6
HI
4
FN4
2
115V
TB1-8
AC
N
J1-S
J1-Z
J6-B
TB8-7
HI
LO
H
PILOT
ARC
TB1-7
PCB3 Right
PWM/Gate Drive
P5-1
20V
R70
10 2W
K3
A
5
K12
8
K4
A
L3
K8
N
K11
A
J1-C
MARK
CUT
CUT/
MARK
LO
CUT
CURRENT
RANGE
61
troubleshootinG
N
FAN
M5
1µF
600V
I(min) RESISTORS
TB9-18
WHT
TB9-13
BOOST
K10
K13
5
8
K14
K13
7
1
TB8-2
TB8-1
MOVE RED WIRE FROM
TB8-1 TO TB8-2 FOR
FOR HI CURRENT RANGE
HI
J1-T
K11
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