Hofmann Snap-on Y2k, Service Manual

Page: 11 / 99

In case of alternatives as shown in
Fig. 11
and
12
, a centrifugal force introduced in S will be
detected by transducer S' only as long as transducer M' does not supply any signal.
Irrespective of the distance of the introduced centrifugal force transducer S' will always
supply a signal proportional to the quantity of the centrifugal force. According to
Fig. 8
and
relative specifications transducer M' will supply a signal proportional to the product of the
amount of unbalance times the distance between the unbalance and point S. As the distance of
a single centrifugal force increases, the quantity of the signal M' will first decrease and then,
when having passed the node of vibration, increase with the relative other sign (plus or
minus).
Reduced the effects of force relations bring about the following advantages:
•
Reduction of influence on sensitivity changes in the transducers following different
influences such as temperature, fatigue, shock, overload, vibrations in transport, humidity,
etc.
•
Reduced necessity for replacement of a transducer.
•
Reduced necessity for readjustment after transport and installation of the machine.
•
Reduced service cost.
•
Increased accuracy of measurement.
•
Less critical requirements to resolution of A/D converters owing to digitized analogue
unbalance signals.
•
Wide virtual distance between measuring planes despite of compact design of the
vibratory system.
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