Electrical
Test lnstruments
MAC-20 Retrofit
Package
Section I
-
General lnformatton and
Specifications
TRADEMARKS
1. "Duffers"
refers
to a device manufactured
by Duffers Corporation
2.
"Accu-Amp"
is
a trademark for
a device originally
made by EIL lnstrOments,
lnc.
3.
"SmartCore"
is a trademark
of ZWorld Engineering,
Davis,
CA.
INTRODUCTION
A high
current test
set, such as
the EIL BTS-50,
may consist of
two
pieces
known
as a
"control
unit" and an "output
unit",
or these functions
may be combined
in a single
package.
These
two functions,
when
connected by external
or internal
power
cables
and control
cables, form
a test system with
high current, low
voltage outputs
used for
primary
injection
testing
of direct acting low
voltage circuit
breakers. The
MAC-20 has
replaced
the old current
metering
system and timer, and
also
provides
enhanced
output
control functions.
GENERAL DESCRIPTION
The MAC-20
microprocessor-based
measurement
and control unit features
digital
readout of
current and time
enhanced by digital
signal
processing.
Pulse
(memory)
mode
provides
fast and accurate
automatic
evaluation of output
current
pulses
as
short
as one half cycle.
The MAC-20 incorporates
a
precision
A"/D
converter and special firmware for
true-RMS
continuous and
pulse
current reading
with much
greater
accuracy. lt
also utilizes
a
sophisticated current sensing system
for more reliable current
latch mode operation
and better timing accuracy. An
LED digital readout for current
in four ranges from 1000
A to 100 KA reduces
the chance of operator
error.
An integral
autoranging timer with
LED readout
provides
four digits in
seconds or cycles mode, with
a resolution of 0.001
second or 0.5 cycle. A
preset
function
allows
you
to set a maximum
ON time in seconds
or cycles, for convenient'Jogging"
of output to desired
current.
The
entire metering and
control
package
is
designed to be removed and replaced
very easily, so that it may
be
transported separately.
The complete retrofit
package
also includes
wiring changes to the
original unit to
accommodate the MAC-20, and may also require
an additional or modified
control
panel
to
accomplish
tap changes and
vernier
control. The retrofit is
designed to simplify the
basic control functions for reliability and
ease of troubleshooting.
Elecirical Test lnstruments,
lnc.
Page l-3
Copyright(C)
1 994-1 998
All Righls Reserved
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