51
Rev G
S6−
−−
−TR400 Diagnostics
Viewing shaft deviation
Overview
The TR400 will calculate and display the deviation for you while the shaft is running
at a stable speed.
How to View
the shaft
deviation
The shaft must be rotating at a steady speed before the deviation is going to
be checked. Press and hold the left arrow key the TR400 will then display the
deviation. Wait until the deviation stops growing and add at least 1% to that
number (2% is desirable). Now enter that number into VAR 24 If during the
course of operation the monitored speed exhibits jumping in the display or the
analog output, the window may be set too low. A very large window will
result in a slower response to a sudden change in speed. This is more
noticeable at slower speeds.
Response
> 50 HZ
feedback
The response to a large step change in speed which does not exceed the
averaging window would be an additional 20mS per pulse that is averaged to
reach the new average. Therefore the longest delay to reach the new average
speed would be: 8 (pulses) * 20ms = 160mS. Each pulse would have made it
1 / (number of pulses averaged) closer to the new speed from the old speed.
Once the averaging window has been broken it accelerates the display and
analog output to match the new speed at the input.
Response
< 50 HZ
feedback
For speeds lower than 50Hz, the time it takes to get from the old speed to the
new speed if the feedback stays inside the averaging window is:
(Number of pulses averaged) * (1 / frequency of the pulses). Each pulse
would have made it 1 / (number of pulses averaged) closer to the new speed
from the old speed.
Once the averaging window has been broken it accelerates the display and
analog output to match the new speed at input.
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