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section 6
6.9 current control pot and remote vref
A Reference Voltage, V
, is used to command the output current of the EPP-450. V
REF
either the Current Control Potentiometer on the front panel or from a remote source. In the "Panel" position, S2, the Panel
/ Remote switch selects the Current Control Potentiometer. In the "Remote" position, the Panel/Remote switch selects the
V
fed into J1-L (+) and J1-J (-). The EPP-450 Output Current, I
REF
I
= (50) x (V
) in the high output current mode and I
OUT
REF
PCB10 is the analog signal scaling board. If 115VAC is fed into P1-2 and P1-3 the output current range is in the high mode
used for cutting from 50 to 450A. With the 115VAC absent, the output current range is in the low mode used for marking
between 10 and 100A and cutting between 35 and 100A.
The Control PC Board contains two inputs for V
the High Speed input (P8-3), the EPP-450 will respond to a change in V
is fed into the Low Speed input (P8-1), the EPP-450 will respond to a change in V
the "Normal" input helps filter electrical noise sometimes encountered in industrial environments.
CONTROL
BOARD
0558038313
0558038312
JUMPER
P4-10
P4-11
220
P4-12
S
S BIAS
P3-3
P3-4
20V
20V
T10
PRI: 120V
SEC: 40VCT
H1
120V
H
: High Speed; and Normal. When the negative of the V
REF
0.00-10.00V
CURRENT REFERENCE
EPP-600: I(out) = (80) X Vref
EPP-450: I(out) = (50) X Vref
200K
HIGH
SPEED
NRM
-
P8-3
P8-1
P4-9
P4-8
+15S
S
P3-5
P4-2
REMOTE
REMOTE
H2
TB8-11
N
TB1-4
+
J1-L
, will follow V
OUT
= (10) x (V
) in the low output current mode.
OUT
REF
within 10 mS. When the negative of the V
REF
200K
S
-
+
P8-2
-
+
P4-7
50
50
S
SIGNAL:
LO: 10V = 100A
HI EPP-450: 1V = 50A
HI EPP-600: 1V = 80A
200K
200K
NRM
-
P4-1
2 2
5 5
S2
PANEL
PANEL
3
3
4
4
6 6
1 1
TB1-6
TB8-12
TB1-5
J1-J, DC SIGNAL
-
COMMON (NEG)
J1-J
ALSO SHOWN
0-10V
ON PAGE 1
60
troubleshootinG
is a DC voltage that can come from
REF
with the following relationship:
REF
within 50 mS. The slower response of
REF
+10T
PRECISION
P5-8
REFERENCE
JUMPER FOR
EPP-600
P2-1
P2-2
PCB10
ANALOG
SCALING
BOARD
0558038326
HIGH
SPEED
-
+
P4-3
signal is fed into
REF
signal
REF
TB1-3
SEE PAGE 1, K13-6
D
N
CURRENT
CURRENT
CONTROL
CONTROL
POT
POT
R50
10K
T
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