12/5/2007 4:21 PM | |
Posts: 5 Rating:
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Is it possible to attach an incremental encoder to the high speed counter and control a motor in two directions an high and low speed with an frequency inverter |
12/6/2007 8:25 PM | |
Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating:
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Hello ols, I think that should be possible. Following questions to that: Which output signals do you need for the excitation of the frequency inverter? Do you need digital or analog output signals? Best regards |
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12/12/2007 10:58 PM | |
Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating:
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Hello ola, unfortunately has the LOGO! no such a function to the (cycle time independent) evaluation of incremental indicators with 2 channels (A and B). Therefore also I had asked the question "How is onto the forum an evaluation of the signals "A" and "B" of synchros possible"?. Meanwhile I have in the German part of the forum in the contribution "Wie ist eine Auswertung der Signale "A" und "B" von Drehgebern möglich ?" concepts to solution and circuits published. These had the directional impulse count in the case of maximum information recovery (evaluation / flank evaluation = 4x) to the destination. ALL circuit-technical solutions lead, in particular because of the analysis of the direction, to restrictions the maximally permissible signal input frequency fab! This follows the current smallest fz cycle frequency in the case of most favorable circuit arrangement the LOGO! The highest signal frequency (= fz/2) is possible in the case of simple evaluation (with counters, above in the circuits represented). The complete information of the signals A and B i want to solve on the other hand, then the maximum signal frequency is restricted to fab = fz/8 (very below in the circuit diagram). In the middle of the circuits one (in each case more different) is available to circuit for the simulated generation of signals. Forum_Inkrementalgeber_V03.zip Your information let to presume that you are rather interested instead of an impulse count for the rotational position sensing onto an evaluation of the impulses per unit of time (= speed measurement), however. The block "threshold trigger" is for this purpose but it is not easy and in most cases not possible to scal the results in physical units. Therefore I published a more flexible copy as an circuit in the forum, for example under Display of scaled High Speed Input Values In the file appendix I created for you now a modified andbuild an circuit design adapted to an incremental 2 cannal sensor... I hope you manage that, otherwise I want to pay attention to your questions here. How does the circuit work? The impulses of the channel A are added in the counter during the measuring time. This keeps up the maximum rate of 2 kHz occur! With the aid of the analoge amplifers the counter value is converted into a physical unit. The definition of the direction can occur on the other hand only at a signal frequency of maximally fz/2 (through analysis of A and B). I chose 50 Hz as a boundary, what is achieved with B011. With higher frequencies of the two coupled input signals the up to now recognized direction is stored and reused up to the drop of the signal frequency! This procedure should function in the case of motor logics perfectly because a route reversal is always accompanied by a preceding rate decrease should go around. In the contribution listed above also references to a signal frequency division are by means of external circuits indicated (Attachment: 173754-da-01-en-C-MOS-IC_HEF4526B.zip). Best regards AttachmentDemo_Threshold_trigger_for_incremental_2_cannal_sensor_V3.zip (2097 Downloads) |
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