
I-4
72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
The rotary motion adapter is used to interface to circuit breakers in which
the mechanism moves in a rotary manner, or to couple to a part of a
breaker mechanism which moves in an arc. In the case of a breaker
which exhibits rotary motion, observe the mechanism and identify the
shaft to be monitored. The rotary motion adapter of the transducer must
be attached to the end of this shaft. The adapter is provided with a drill
chuck which accommodates up to a 3/8" diameter shaft. The shaft in the
breaker can be provided with a threaded hole for a suitable adapter. If
this is not the case, an adapter with a 3/8" extension for the chuck collar
can be fabricated. This collar slips over the end of the shaft and is
retained by a set screw. If this is not possible, the chuck is removed from
the rotary motion adapter and other fixtures are installed in its place.
The transducer supports itself on the end of the rotary motion shaft,
however, a means of preventing rotation of the transducer during circuit
breaker operation must be provided. To do this, a length of 2" x 2" angle
is clamped to the transducer and to a suitable part of the circuit breaker
structure. Care should be used to minimize the free motion in this setup,
as it causes errors in the recorded data. The base plate of the transducer
is removed to provide more clearance. When this is done, the angle
stock is screwed to the transducer using the base plate mounting holes.
A sensing switch on the transducer determines if a rotary adapter is in use
before the test begins. The software then checks to ensure that the
Breaker Test Plan Motion Channels are properly configured. The actual
units in use for the test results are dictated by the entries into the Breaker
Test Plan.
If a breaker has no location where there is a rotating shaft, or no point
where a linear motion can be monitored, there could be a location
where there is a component which moves through an arc. In this case, a
small rod (approximately 1/4") is attached to the breaker mechanism with
a swivel joint and to a similar length crank arm mounted in the chuck of
the Rotary adapter. In this way the rotation of this shaft is translated and
measured.
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