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Multimode Frequency Averaging Filters
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The multimode frequency averaging filter is the signal processing extension of our well established encoder signal filters. While the signal filters clean-up and ensure the electrical and low-level integrity of the encoder signals, the averaging filters, in addition, process these signals to reproduce them at average input frequency. They process quadrature/encoder or general clock/direction type inputs.
 
Maxi Line Multimode Frequency Averaging Filter
Maxi multimode frequency averaging filter
Mini Line Multimode Frequency Averaging Filter
Mini multimode frequency averaging filter

This specialty filter is particularly suited to slow moving production lines where the ideal control variable is average, and not instantaneous, speed. This happens because instantaneous speed varies randomly due to external events and systematically due to the various coupled, but uncontrolled, mechanisms to the plant power train. As such, instantaneous speed cannot be effectively controlled as its measurement is randomly biased and noisy. In contrast, average speed measurement contains only the net effect of these uncontrolled mechanisms and does not allow them to corrupt speed measurement control. Typical applications of the averaging filters are:


These unique frequency averaging multimode filters are standard, all-in-one, comprehensive products and process digital quadrature encoder or general clock/direction signals in the frequency range from 1 Hz to 4 KHz and are offered in two standard lines: the fully featured Maxi and the low cost Mini line. They process signals with the following features and characteristics:

Multimode Frequency Averaging Filter Line Features Overview
Feature Maxi Frequency Averaging Filter
Maxi line
Mini Frequency Averaging Filter
Mini line
Galvanically isolated input and output stages to interrupt unavoidable system ground loops eliminating related noise as well as protecting the input stage of the driven controller from high voltage transients. 5 V/ns minimum dV/dt galvanic barrier immunity 0.1 V/ns minimum dV/dt galvanic barrier immunity
Noise and dither prefilter: the inputs are processed for electronic noise and analyzed for mechanical position to recover corrupted motion sequences. Yes Yes
Two selectable modes of average calculation:
  • Average displacement period: the encoder displacement is measured over a fixed accumulating time duration and the average frequency is then calculated. With this method measurement time is fixed and the resulting accuracy is variable proportionally increasing with encoder speed, and
  • Average signal period: the encoder period is measured after accumulating a fixed number of displacement pulses and the average frequency is then calculated. With this mode accuracy is fixed and measurement time is variable and inversely proportional to encoder speed.
Yes Yes
Running average postfilter to further smooth the measured values with user-selectable sample size. Yes Yes
Selectable sample size and measurement time. Measurement sample size and accumulation time is user-selectable for maximum versatility and adaptability. Yes Yes
Direction reversal. One of the encoder channels can be complemented to effect a direction reversal, thus saving the rewiring/reconnection of the encoder signals. Yes Yes
Supply, signal and worn/faulty encoder indication. Five LEDs indicate the status of the power supply, the three encoder channels and the presence of out-of-sequence signalling, typically caused by a worn or faulty encoder. Yes Yes
Independent, galvanically-isolated fault output. Any fault condition activates this uncommitted optotransistor output interfacing to external systems. Yes Yes
DIP switch selectable options. All operational parameters and functions are set/reset via DIP switches. Yes Yes
Types of EIA(RS)422 input termination Standard DC, AC and none Standard DC and none
Power supply Internal dual voltage 115/230 VAC twin isolated supply. The twin supply powers the two internally isolated, input and output, filter sections and can also power the monitored encoder with regulated 5 VDC or unregulated 10 VDC None. Power must be supplied externally to each of the two filter sections.
Enclosure Cast aluminum enclosure of IP65 protection and high noise immunity. Plastic, DIN-rail mountable.


Available models are characterized by signal format, input/output type, power supply and enclosure type:

Multimode Frequency Averaging Filter Model Selection Table
Model Input format Input connections Output connections Twin internal power supply Enclosure Buy online
SFAFDxxx
Mini Multimode Frequency Averaging Filter
Clock, Direction, Enable EIA422 and all 10-28 V types EIA422 and all 10-28 V types No Plastic IP40 DIN rail Yes
EFAFDxxx
Mini Multimode Frequency Averaging Filter
Encoder quadrature A, B, Z EIA422 and all 10-28 V types EIA422 and all 10-28 V types No Plastic IP40 DIN rail Yes
EFADO01
Maxi Multimode Frequency Averaging Filter
Encoder quadrature A, B, Z Differential EIA422 only Differential EIA422 only Yes Cast aluminium, IP65 No
EFASO01
Maxi Multimode Frequency Averaging Filter
Encoder quadrature A, B, Z Single-ended: 5 V, 5-30 V NPN and Push-Pull only.

Differential: EIA422.

Single-ended: 5-28 V PNP and Push-Pull only.

Differential: None.

Yes Cast aluminium, IP65 No


As with its sister products, the filter design is characterized by typical industrial application considerations: low ownership cost, standard interfacing, fool-proof installation, transparent operation, results-oriented and all-inclusive design. The filters feature the following operational characteristics:


You can buy small quantities of the Mini filters online here.
 
 


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