MTS Series 793 Utility Software - Manual (Page 84)

Description Item
Filter Type: Used to select the type of digital filter used to filter
the input signal. Filter selections include: Disabled, Bessel,
Butterworth, and Elliptical. (Default=Bessel, 300 Hz.)
Filter: This is the frequency where the filter, selected in the Filter
Type box, attenuates the signal by 3 dB.
Low frequency limit = >0 Hz (A setting of 0 disables the filter.)
High frequency limit = 1/2 the system rate.
RPC Delay Adjust: Enter a delay value for an encoder input that
will correct for the time shift in this channel’s collected time history
data relative to a time history drive. Analog Input icons (continued)
Important:
If you change the system rate, you must remeasure the lead
or lag time associated with the encoder and change the
RPC Delay Adjust setting as necessary.
To compensate for the lead or lag time associated with an encoder.
1. Run a test and collect time history data.
2. Use RPC software to determine the lead or lag time of the
encoder signal in relation to the drive signal.
3. In the HWI Editor application, enter the RPC Delay Adjust
value (in seconds) in the encoder’s Analog Input properties.
If the encoder signal lags the drive signal, enter a positive
(+) number.
If the encoder signal leads the drive signal, enter a negative
(-) number.
4. Rerun the test and check the time shift.
Model 494.49 Quad Encoder Interface HWI Settings
You can configure this card to condition four encoders, or to provide an external clock output.
When configured for encoders, each encoder includes two signals:
• The position signal from the encoder
• A velocity signal derived from the encoder’s position signal
With the exception of no support for UART devices, the Model 494.49 .HWI settings are identical
to the Model 494.47 .HWI settings.
70 MTS Series 793 Utility Software
HWI Hardware Settings