lnstallation
and
Adjustments lnstructions
v
v
Removing
and Replacing
the
Trip
Unit's
Transparent
Cover
The current
protection
adjustments on the front
panel
of the
trip unit can be secured
against tampering by a
plexiglass
transparent cover
(see
Accessories
section).
1) Prior to
setting the adjustments, the transparent cover must be
removed.
All that is required
to
remove
the cover
is
to
remove
the
two nylon
seaiing screws that hold it in
place.
2.)
Afler
the adjustments have
been set to the desired
posrtions,
the cover should
be
replaced
and a wire may be lnserted.
3.) After insertlng the wire, secure with a lead seal to
prevent
tampering
Setting the Overcurrent
Protection Adjustments
The trip unit executes its overcurrent
protection
functions
based on the current sensor
rating
and the
settings of the
current
protection
adjustments.
Therefore, care should be
taken by the user to make
proper
sensor selection and adjust-
ment settings,
CAUTION:
An
adjustment
will momentarily revert to
its
minimum
possible
setting
whenever a change to the
adiustment
is
being
made. This may cause
inadvertent
tripping of
the circuit breaker
if
the adjustment
is made
with
the circuit
breaker in lhe closed
position.
Therefore,
Siemens
recommends
that all adjustment
changes be
made with
the circuit breaker
open.
To
set an adjustment,
place
a slotted
screw driver onto the
point-to-point
adjustment switch and
rotate
the switch
to the
desired setting.
The figure on the following
page
describes
the region of the
time current curve
that is being affected by each adjustment.
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