Hardy HI6800 Series, Руководство пользователя

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Chapter 5 – Configuration
Hardy H6800 Series Application Controllers User Guide 67
5.5.2 Configuring Filters
Path:
Home screen > Setup > Filter
Mechanical noise, such as noise from other machinery in a plant environment, can be
present in forces larger than the weight forces being measured. The Filter screen configures
WAVERSAVER ® and WAV settings to eliminate the effects of vibratory forces
present in all dynamic and static industrial weight control and measurement applications. By
factoring out nearly all of the ambient vibratory forces, the HI6800 Series Application
Controller can separate out the actual weight data from background noise caused by
vibration.
5.5.2.1 WAVERSAVER ®
Use the Filter screen to configure WAVERSAVER
®
to ignore noise with frequencies as low
as 0.25 Hz. One of eight higher additional cut off frequencies can be selected to provide a
faster instrument response time. The default factory setting is 1Hz vibration frequency
immunity.
To determine which WAVERSAVER
®
setting is right for your application, use the rough
guideline that the less vibration to which your scale is exposed, the faster the weighing time.
To reduce the effects of low:
•
Amplitude high frequency vibrations, use WAVERSAVER ® settings OFF, 7.5 Hz, 3.5 Hz,
1.0 Hz. 0.5 Hz, 0.25Hz
•
High amplitude low frequency vibrations, use WAVERSAVER ® settings 0.5Hz or 0.25Hz.
The WAVERSAVER
®
calculation speed is independent of the sample rate.
The approximate timing for WAVERSAVER ® calculations are as follows:
•
3.5 Hz = 120 ms
•
7.5 Hz = 60 ms
• 0.5 Hz = 1 seconds • 1 Hz = 500 ms
•
WAVERSAVER OFF = 0 seconds.
•
0.25 Hz = 2 seconds
(available at 110 updates per second)
After a change on the scale, the total time to finalize a new weight reading is the
WAVERSAVER
®
plus the Number of Averages. Calculate the amount of time your product
will be fully on the scale, and then adjust the Number of Averages setting to add up to less
than that time period.