VIGIL EVAS BVRD2M
Operating Instructions
BVRD2M issue 2
11
C O M M U N I C A T I O N S
Figure 1.7 — BVRDACO Amplifier / Line Fault Detection
Amplifier
1
100V
Output
Reser
ve
Amplifier
100V
Output
0V
+5V
10K
10K
1K8
100K
100K
+5V
0V
+5V
0V
0V
2K2
11W
Line
Fault
(LF1)
Amp
Fault
(AF1)
Reser
ve
Fault
(RES)
100V
Output
Line
1
Opto-Isolated
AC
V
o
ltage
Sensors
End
of
Line
Vo
ltage
Sensor
Ear
th
Leakage
Vo
lt
ag
e
Generator
Vo
lt
ag
es
&
Actions
due
to
Sur
veillance
To
ne
Monitoring:
A)
If
Ear
th
Leakage
is
detected
(LF1
<
0.5V)
an
Ear
th
Fault
will
be
announced
and
no
fur
ther
action
is
tak
en.
B)
If
Open
Cir
cuit
line
is
detected
(LF1
=
0.5V
&
AF1
=
0V)
a
Line
O/C
Fault
will
be
announced
and
no
fur
ther
action
is
tak
en.
C)
If
No
Output
is
detected
fr
om
Amplifier
1
(AF1
=
5V)
the
pr
ocess
is
as
fo
llow
s:
i)
The
Reser
ve
Amplifier
Output
is
check
ed.
ii)
If
OK
(RES
=
0V)
the
Reser
ve
is
s
w
itched
in
and
the
Line
(AF1)
is
then
check
ed
again.
If
the
Line
is
no
w
satisfactor
y
(LF1
=
1.8V)
the
Reser
ve
sta
ys
s
witched
in
and
an
Amplifier
Fault
is
announced.
If
ther
e
is
still
no
output
the
Reser
ve
is
s
witched
out
and
a
Line
S/C
Fault
is
announced.