Electrical Test Instruments PI-6000
Section V - Service Information and Documentation
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Copyright(C) 1994-2019 Electrical Test Instruments, LLC All Rights Reserved
Page V-1
The inherently delicate nature of electronic circuitry and metering make it
generally inadvisable to leave the Indicator Control Panel and MAC-21 fastened
into the breaker test set if it is being transported under conditions of extreme
shock and vibration. The standard rack-mount hardware and twist-lock
connector make it simple to remove the Indicator Control Panel and MAC-21
and carry or ship them separately. Suggested periodic maintenance consists of
the following:
1.
Clean the lenses of the LED displays with a plastic cleaner.
2.
Clean the front panel with a soft brush and cloth.
3.
Perform basic field operational check as described below.
Field performance check of the MAC-21 may be performed as follows:
1.
Obtain a current measuring calibration standard capable of reading TRUE-
RMS current up to at least 1000 Amperes to an accuracy of at least 0.25%.
2.
Set up the breaker test set for normal breaker testing.
3.
Connect the calibration standard to the desired output tap. If cables are
used, it is recommended that they be twisted so as to minimize radiation
and pickup of stray magnetic fields.
4.
Apply power to test set and allow at least 10 minutes for circuits to stabilize.
5.
Check ammeter zero in all ranges. If reading on current meter is greater
than 1% of Full Scale, internal zero adjustment may be required. If
adjustments are anticipated, remove the MAC-21 from the test set and
remove the top cover.
6.
Set MAC-21 Range to 1000 A and adjust output of breaker test set to exactly
800 Amperes. If Coarse Tap is 1, and Output Control Rheostat is less than
50%, additional resistance must be added to output circuit. This is important,
because waveform distortion is more prevalent at lower levels.
7.
If the MAC-21 reading differs from the standard by more than rated
accuracy, adjust the gain potentiometer for proper reading. If an error of
more than 5% is noted, and unit has been in service, the accuracy and
validity of previous tests may be questionable; otherwise, there may be a
problem in the test setup.
8.
Check accuracy at 200, 400, 600, and 1000 Amperes.
9.
Adjust the current to zero, and press RESET key.
10.
Raise the current slowly, until the timer begins to run. This is the Current
