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ABB Modures LZ92-1 - MAIN PROCESSING UNIT SWITCH SYMBOLS

ABB Modures LZ92-1
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3.8
Time
step
characteristic
The
operating
times
of
zone
2
and
higher
include
the
basic
operating
time
of
the
relay
without
any
intentional
delay
plus
the
corresponding
set
time
delay.
No
provision
is
made
for
delaying
zone
1
in
the
main
processing
units
PCB
8
acc.
to
HESG
439 686
(section
3.12).
If
it
is
desired
to
delay
zone
1
in
this
case,
then
the
normal
zone
1
can
be
blocked
with
PCB
switch
6a
so
that
zone
2
becomes
zone
1
with
an
operating
time
t2
etc.,
the
relay
having
a
total
of
three
zones.
Zone 1
can
be
delayed
separately
in
the
case
of
main
processing
uni
ts
with
PCB
8
ace.
to
HESG
440
718
(section
3
.12)
between
0
and
15 x T
(T
=
period
of
rated
system
frequency)
. The
desired
time
is
set
using
soldere~
lfr\k
LB18
on
the
soldered
side
of
PCB
8
(see
Fig.
9.32).
The
delays
of
the
zones
2
and
4
are
set
digitally
on
thumbwheel
switches
in
the
following
ranges:
2nd.
time
step:
0
to
0.99
s
in
steps
of
0.01
s
3rd.
time
step:
0
to
0.99
s
in
steps
of
0.01
s
and
0
to
9.9
s
in
steps
of
0.1
s
4th
time
step:
0
to
9.9
s
in
steps
of
0.1
s
The
alternative
setting
ranges
for
the
2nd.
time
step
are
determined
by
selec-
ting
the
factor
kt
with
PCB
switch
6b
(see
Fig.
9.28).
The minimum
grading
time
between
different
LZ91
respectively
LZ92
relays
should
not
be
less
than
the
sum
of
the
circuit-breaker
operating
time
plus
150
ms. The
150
ms
are
the
sum
of
relay
operating
time
+
relay
reset
time
+ a
safety
margin.
3.9
Symbols
and
significance
of
the
switches
on
the
main
processing
unit
The
legend
below
the
white
line
on
the
frontplate
of
the
KI91,
KZ91
or
KZ91-1
(see
Figures
9.5
to
9.8),
which
is
behind
the
hinged
lower
flap
when
the
unit
is
in
the
rack,
shows
the
symbols,
the
number
of
the
PCB's
and
the
locations
of
the
PCB
switches.
The
numbers
1
to
8
(from
left
to
right)
refer
to
the
PCB's,
below
which
can
be
found
the
symbols
corresponding
to
the
switch
positions
and
an
indication
of
the
switch
location
on
the
PCB.
For
example,
the
designation
6a
refers
to
the
first
switch
from
the
frontplate
towards
the
rear
on
PCB
6.
Just
so
6b
is
the
second
switch
from
the
front
on
PCB
6.
The
locations
of
the
switches
can
also
be
seen
from
the
PCB
drawings
in
the
appendicies.
The
symbols
and
functions
of
the
switches
are
as
follows:
switch
1
position
1
A_
for
grounded
systems
position
2
6
for
non-grounded
systems
switch
6a
position
1
4
zone
1
blocked
position
2
tl
zone
1
in
operation
23

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