Multimode Frequency Averaging Filters |
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Maxi 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 line |
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:
|
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
|
Clock, Direction, Enable | EIA422 and all 10-28 V types | EIA422 and all 10-28 V types | No | Plastic IP40 DIN rail | Yes |
EFAFDxxx
|
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
|
Encoder quadrature A, B, Z | Differential EIA422 only | Differential EIA422 only | Yes | Cast aluminium, IP65 | No |
EFASO01
|
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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