ESAB Plasmarc EPP-601, Руководство пользователя

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58
section 6 troubleshootinG
6.9 current control pot and remote vref
A Reference Voltage, V
REF
, is used to command the output current of the EPP-601. V
REF
is a DC voltage that can come from
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
REF
fed into J1-L (+) and J1-J (-). The EPP-601 Output Current, I
OUT
, will follow V
REF
with the following relationship:
I
OUT
= (80) x (V
REF
) in the high output current mode and I
OUT
= (10) x (V
REF
) in the low output current mode.
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 600A. 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
REF
: High Speed; and Normal. When the negative of the V
REF
signal is fed into
the High Speed input (P8-3), the EPP-601 will respond to a change in V
REF
within 10 mS. When the negative of the V
REF
signal
is fed into the Low Speed input (P8-1), the EPP-601 will respond to a change in V
REF
within 50 mS. The slower response of
the “Normal” input helps filter electrical noise sometimes encountered in industrial environments.
200K
.01 .01
200K
10K
SEE PAGE 1, K13-6
R50
P5-8 TB1-3
T
D
N
J1-J, DC SIGNAL
COMMON (NEG)
ALSO SHOWN
ON PAGE 1
EPP-600: I(out) = (80) X Vref
0.00-10.00V
CURRENT REFERENCE
HIGH
SPEED
NRM
P8-3
CONTROL
BOARD
0558038313
+10T
PRECISION
REFERENCE
S
HI EPP-600: 1V = 80A
ANALOG
SCALING
BOARD
P1-
3
P1-2
SIGNAL:
0-10V
P2-1 P2-2
P8-1
+
-
-
+15S
PCB10
115VA
C
=
H
IGH
R
A
N
G
E
HIGH
P4-3
NRM SPEED
S
200K
-
- +
P4-1
P4-2
200K
S
TB1-5
TB8-11
TB1-4
TB8-12
P8-2
JUMPER FOR
EPP-600
S2
-
+
TB1-6
J1-J
J1-L
50
0558038326
50
P4-9
220
P3-3 P3-5 P3-4
T10
SEC: 40VCT
H N
C45
S BIAS
120V
PRI: 120V
C46
H1 H2
20V 20V
P4-10 P4-7
-
+
LO: 10V = 100A
P4-11
JUMPER
S
P4-8
220
P4-12
66
REMOTE
4
REMOTE
4
11
55
CURRENT
CONTROL
POT
CURRENT
CONTROL
POT
22
PANEL
3
PANEL
3