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ABB Modures LZ92-1 - Page 31

ABB Modures LZ92-1
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5.5
Auxiliary
supply
Check
that
the
polarity
of
the
auxiliary
d.c.
is
correct.
The
auxiliary
d.c.
supply
must
remain
within
the
permissible
range
of
variation
of
the
DC/DC
converter
supplied
with
the
relay
under
all
operating
conditions
(see
technical
data
of
the
DC/DC
converter)
•
5.6
Loading
of
tripping
and
signalling
contacts
Check
the
section
"Contact
Data"
of
the
corresponding
Data
Sheet
to
ensure
that
the
ratings
of
the
contacts
are
adequate
for
the
duty.
5.7
Opto-coupler
inputs
Check
the
voltage
against
the
order
code
and
the
polarity
of
all
opto-coupler
inputs
(opto-coupler
unit:
Mll5,
inputs
Al2
and
B12
of
the
input
transformer
unit
EW91
and
any
other
opto-couplers
in
interfacing
units).
If
the
opto-coup-
ler
input
of
the
EW91
is
used
to
block
the
relay
by
an
auxiliary
N/O
contact
of
an
m.c.b.
in
the
p.t.
circuit
(auxiliary
contact
closed
when
the
main
contacts
are
closed),
the
link
W61
must
be
changed
to
output
Q
(see
Figures
9.19
respec-
tively
9.20).
29

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