Siemens Static Trip III User Manual

Testing
I
General
Static
Trip lll trip devices
can be
f ield tested
either
with
primary
current
through the
breaker or
with secondary
current
applied
directly
to the
trip device.
The ease of
testing
with secondary
current
is
one
of the advantages
of
these devices.
With
comparatively
inexpensive
and
readily available
equipment,
it
is
possible
to demonstrate
that the
tripping
system
will open
the
breaker and
verify that the
device
conforms
to the
pub-
lished time-current
curves.
However,
field testing
cannot
be
expected
to be as accurate
as
factory calibration.
Therefore
slight discrepancies
between
f ield tests and
factory calibration
can be
regarded as
normal, lf
large deviations
or
improper
operation
should occur,
it is
recommended
that
your
Siemens
Energy &
Automation office
be contacted
for advice,
Secondary
Current
Testing
Portable test set
PTS4
is
available
for secondary
current
testing
and
is designed to
plug
into a standard
.1
20 volt outlet.
With this
test set, Static
Trip lll trip devices
can
be tested
by
themselves,
or on a circuit
breaker
outside the
cubicle,
or
inside
the cubicle
with the breaker
in the
TEST or
DISCON-
NECTED
position.
A training
videotape
is available
which
shows
proper
operation of
the PTS4
test set
(see
Ordering
lnformation
section).
Portable Test Set
PTS4
There
is a terminal
block on the
circuit breaker
just
above
the
trip device.
This
terminal
block
accepts a
plug
from
the test set
when testing
with the device
on the breaker,
Make
all connec-
tions with
power
removed
from the
test set.
When
testing
with the Static
Trip lll device
off
the
circuit
breaker,
connections
must be
made to the
spade
type
termi-
nals of the connecting
strip.
Making
these
connections
in-
volves the
risk of shorting
between
clips
which
can damage
the
device.
To avoid
this, the
PTS4 test
set
includes
a terminal
block
for the connecting
strip
from the trip
device
similar
to the
one on
the circuit
breaker
so
that the
spade
terminals
are
properly
isolated.
The output
of the
test set
is internally
con-
nected to
the terminal
block.
Static
Trip lll devices
have two
LEDs
(Light
Emitting
Diodes)
mounted
on the
front
panel,
One
of these
indicates
Long
Time
Pickup
and the
other
indicates Short
Time or Ground
Pickup.
Unlike
the earlier
model
of trip
devices
no connections
are
required
to indicate
when
pickup
occurs.
These
LEDs
also
operate
during
normal operation
on
the breaker,
and
are useful
in
indicating
when the
long time
current
setting
may be
set too
low.
Test Connections
Current
is supplied
to terminals
1 and 5 to
test
phase
1
,2
and
5 to test
phase
2; 3 and
5 to test
phase
3; and
4 and
5 to test
the
ground
circuit on
devices
with
ground
fault tripping.
For secondary
current
testing
a circuit
breaker
is
not needed
lf the device
is mounted on
a circuit
breaker
it
is not necessary
to close
the breaker,
Long
Time Pickup
Test
Set
ihe
Long
Time Current
Setting
on
.5. Move
the switch
above
the LED
timer
readout on the
PTS4
to
"Static
Trip
lll Long
Time" and select
the
phase
to
be tested.
Raise the
current
slowly
untilthe
long
time
pickup
LED
is illuminated.
This should
occur between
.25 and
.30 amperes
(or
between
the
setting
value and
12O%
of the setting
value), as
shown
in
Table
1.
Decrease
the current
slightly
and
the
LED should
go
out
When
the
LED is
illuminated continuously
the
device
will eventually
time
out. The
Long
Time circuits
calculate
the
true
RMS
value.
This
produces
a
noticeable
time delay
(about
3 to
4 seconds)
from the
time the
current
reaches
the
pickup
point
to the
time
pickup
is indicated
by
the
LED.
Repeat the
test
for the other
available
settings
and
compare
to the values
in Table
1
below.
The current
values
for
secondary
testing
of Static
Trip
lll Long
Time function
are
given
in Table
1 below.
Table
1
Long Time Secondary
Pickup Current
Current
Setting
.50 .55
.60
.65 .70 .75
.80 .85
.9(
.95
1.0
Secondary
Amperes
I\,4 i n
25
275 .30 323
.40
425
4a .475
50
lVIax 30
.330
.10
.390
42 450
48 510
54 .574 .60
v
29

Siemens Static Trip III Specifications

General

Brand	Siemens
Model	Static Trip III
Category	Circuit breakers
Language	English