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Explanation
IM WT3001E-51EN
1.5 Selecting the Line Filter and Synchronization Source
• Selecting the Line Filter
A line filter can be inserted into the circuits that measure the revolution signal and
torque signal. It eliminates harmonic noise.
The cutoff frequency can be selected from the list of choices below.
OFF, 100 Hz, and 50 kHz
Selecting OFF disables the filter.
Note
If the signal type (see section 1.3) is Pulse, the filter function does not work.
• Line Filter and Measurement Mode
• The line filter setting is common to all measurement modes except cycle-by-cycle
measurement mode. The initial setting is OFF.
• The line filter setting in cycle-by-cycle measurement mode is independent of the
setting in other measurement modes. The initial setting is 50 kHz.
• Selecting the Synchronization Source
• Select which element's input signal will be used as a synchronization source
(synchronized to the zero-crossing point of the selected signal) when measuring
the analog signal of the revolution signal and torque signal. Select the signal to
be the synchronization source from the choices below. The selectable items vary
depending on the installed elements.
U1, I1, U2, I2, U3, I3, U4, I4, Ext Clk (external clock)
* For the specifications of the Ext Clk (external clock), see the explanation in section
7.4.
• The measurement period determined by the synchronization source selected here
is used to measure the analog signal of the revolution signal and torque signal. If
you specify no synchronization source by selecting "None," the entire sampled data
within the data update interval is the data used to determine the rotating speed and
torque. For details on the synchronization source, see appendix 6 in the User's
Manual IM WT3001E-01EN.
• If the rotating or torque signal is a pulse signal, the average of the pulse signal
interval over the measurement period determined by the synchronization source
selected here is the measured value of the rotating or torque signal. If the pulse signal
interval is not within this measurement period, the measured value is determined
from the previous interval.
• To achieve stable measured values by matching the measurement period with
the measurement functions of voltage, current, active power, and so on such
as during the measurement of the motor efficiency, it is recommended that the
synchronization source be set to the same synchronization source specified in
section 4.7 in the User's Manual IM WT3001E-01EN.
*
, and None
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Index
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