Electrical
Test lnstruments
MAC-20 Retrofit
Package
Section I -
General lnformation
and Specifications
ABOUT THIS
MANUAL
This manual
consists of completely
new
descriptive, operational, and
technical informa-
tion, based on many
years
of experience
in the
design,
manufacturing,
and operation of
electrical
protective
device test equipment.
lt is intended
to
provide
useful,
up-to-date
and complete
information for
safe and efficient
operation of the
test set.
CHANGES FROM
ORIGINAL TEST
SETS
Several changes have
been made in
the design of high
current test sets
since early
models such
as the EIL BTS-50,
many of which are important
for
safety and conven-
ience of operation.
Some of
these may have been incorporated
with
the modifications
associated with the
upgrade to the MAC-20 metering
and control
system.
ln
the case of some manually
operated models,
such
as
the BTS-50,
the original control
panel
may have
been retained, but in
most retrofits a new indicator/control
panel
has
been installed. ln
either case, the control
panel
allows operation
of the test set without
the MAC-20, if necessary. The
control
panel
also
provides
test
(output
ON/OFF)
indicators, interlock
indicators, and a
power
on indicator.
Test sets which
are controlled by a microprocessor
or computer, such
as the EIL PS-
250 and
PS-600,
or the Phenix Technologies'
HC-30 and HC-100, require
the addition
of a special control
panel.
This replaces the functions
of tap selection and vernier
adjustment with electromechanical
components such as switches
and
relays,
to reduce
complexity and
enhance
reliability.
The
EIL BTS-50, BTS-30 and BTS-20 units
used the old Duffers current meter for
current and time measurement. The
newer BTS-500, BTS-300,
and
BTS-200
used the
improved
Accu-Amp.
Units manufactured by
other companies used other instrumenta-
tion
for
this
purpose.
ln
all cases covered by this manual, the old current meter
and timer have been
replaced with the MAC-20 microprocessor
based
measurement
and control unit.
Electric€l Test lnstruments, lnc.
Page 12
Copyright(C)'1 994-'1 998 All Rights Reserved
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