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ABB Modures LZ91 - Page 41

ABB Modures LZ91
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8.
TROUBLE-SHOOTING
Should
the
relay
appear
defective,
proceed
as
follows:
-
Check
that
the
thumbwheel
switch
of
the
neutral
current
element
in
the
KZ91
or
KZ91-1
is
not
set
to
zero.
-
Check
the
+ 15 V
and
+ 24 V
auxiliary
supplies
are
in
order
at
the
edge
connector
of
each
plug-in
unit
(see
relative
instructions
for
the
terminal
designations
of
the
DC/DC
converter)
•
-
Check
the
correctness
of
the
signals
at
the
sockets
on
the
front
of
the
EW91
(see
Section
6.3).
If
not,
check
the
relay
wiring.
-
Localise
a
defect
by
withdrawing
the
KI
or
KZ
unit
and
rechecking
the
signals
at
the
sockets
on
the
EW91.
If
they
are
in
order,
a
defective
main
processing
unit
is
to
be
suspected.
-
Replace
the
defective
unit.
Should
it
not
be
possible
to
locate
and
clear
a
defect,
then
the
complete
relay
or
plug-in
unit
concerned
must
be
returned
to
the
nearest
BBC
agent,
or
directly
to
ABB
Baden,
Switzer
land.
39

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