Electrical Test Instruments MAC-20 User Manual

Z-.
Electrical
Test lnstruments
MAC-20
Retrofit
Package
Section
lll
-
Operating
lnstructions
or lower,
depending
on
how
fast the
breaker
trips)'
7.
Press
PRESET
again
to
return
to
normal
mode.
8.
Select
MEMORY
mode.
L
Repeatedly
jog
the
INITIATE
button'
while
adjusting
the
OUTPUT
CONTROL
nili"r,
,ntirirr'"
circuit
breaker
trips
instantaneously.
This
is the approximate
pickup
fo"int.
tt insufficient
current
is obtained
at
maximum
position
of
the
vernier,.set
the
bUfpUf
TAp
control
to
the
next
higher
tap,
return
the
vernier
to zero,
and
con-
tinue.
10.
Close
breaker
under
test.
ll.Byrepeatingthetest,determinetheMIN|MUMSETTINGoftheOUTPUT
cbruinor_,
at
which
the
breaker
under
test
opens
immediately,
whenever
the
INITIATE
button
is dePressed
12.
Read
and
record
ammeter
reading
as
instantaneous
pick-up
of the
breaker.
13.
Repeat
the
above
test
for the
other
poles
of
the circuit
breaker'
14. lf
trip settings
were
modified
for test
purposes, restore
them
to
their
original
values.
15.
Shut
down
test
set,
disconnect
breaker,
and
prepare for subsequent
testing
or
relocation
according
to
steps
20
through
25 in
general
procedures
outlined
above.
lnstantaneous
TriP
Time
Test
1.
Perform
lnstantaneous
Pickup
Test as
outlined
above'
2.
Adjust
controls
to
obtain
current
above
pickup, at approximate
desired
multiple
of
rating.
3.
Close
breaker
under
test.
4. Press
the
INITIATE
button.
Breaker
should
trip
instantaneously
5.
Read
and
record
timer
and
ammeter
readings
as instantaneous
trip
time
and
current.
6.
Repeat
the above
test
for the
other
poles
of
the
circuit
breaker'
7.
Shut
down
test
set,
disconnect
breaker,
and
prepare for
subsequent
testing
or
relocation
according
to steps
20
through
25
in
general
procedures outlined
above'
Copyright(C)
1994-1998
ElectricalTest
lnstruments'
lnc
All
Rights
Reserved
Page
lll-13

Electrical Test Instruments MAC-20 Specifications

General

Brand	Electrical Test Instruments
Model	MAC-20
Category	Controller
Language	English