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Showing results for tags 'encoder'.
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We are working with two VFDs FR-A820 Series, each of them driving a motor that obey a master-slave relationship. One of them is in speed control, while the other is in torque control. Each of the VFDs has one of the Mitsubishi FR-A8AP encoder reading cards that collect the data from an Avtron A56 encoder. While testing our system it came our realization that, if one measures the resistance across the terminals of the encoder cards mounted on the VFD these are not the same. Concretely, this is the reading we get: (see attached) We noticed that this difference in the resistance causes a voltage drop in the encoder signal when looked over a oscilloscope. We are surprised that this resistance is different: a) between the cards, b) between the terminals A and B in the VFD. We wanted to ask: Is this behavior expected? Should the resistances in both cases be different? Is this something we should be concerned about? So far our application works and our motor turns as they should, but we are quite surprised that this is the case.
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Hey group! I am working on a project that has a machine that forms cartons that will drop the cartons into a cleated conveyor after they are formed. The forming machine needs to be synchronized with the cleated conveyor so that the formed cartons will drop in between the cleats as they pass under the forming machine. So, in essence, the conveyor will be the master and the forming machine will be a slave to the conveyor and match its position accordingly. Initially, it was proposed that the conveyor utilize a CIP encoder so it could be set up as a motion axis, but the customer declined that option as they didn't care for using CIP encoders (can't really blame them!). So, a slightly cruder proposal of using two 1024 count encoders was proposed, which they accepted. However, your friendly programmer here isn't quite sure how to make that work! I think the basic concept is encoder following but but I can't seem to find anything online that really describes the actual process or logic for this. The RA Sample Code site doesn't seem to have anything on there but maybe I just haven't entered the right search keywords. The forming machine has the following notable components: 5069-L310ER 5069-HSC2xOB4 PowerFlex 525 drive 1024 count incremental encoder As noted, the idea is to have a 1024 count encoder mounted on the conveyor with some sort of ratio so that the counts will run the pitch of the cleats 508 mm). Some trickery will have to worked in to get them to sync at the right time but for the time being, I'm just looking for a method to do the encoder following and asking the group if anyone has some ideas, or better yet, a method, of how to accomplish that.
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Hi, I have to implement an axis control in a NX1P2 PLC using an inverter (3G3MX2) and an encoder cabled on a EC0122 board. I found something similar implemented on a CJ2M PLC, but I have no idea how to set up the axis in the configuration of sysmac studio and how to implement the control. Can someone help me? Some sample to catch out the configuration? Thanks a lot Andrea
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Hey folksI'm trying to make a Ladder program in Sysmac Studio to control a Crane.The crane gets via a HMI a position that it must drive to, first at high speed then in low speed this is controlled via encoder signal for fine positioning there are several sensors.For all this I have an NX1P2-9B24DT1, NX-EC0222 and 3G3MX2-A4030-ESomeone here who can help me with an example of how this can be done in Ladder.Many thanks in advance for your help.
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Hello There, Hope you are safe and Healthy. I am using Omon "CP1L-EM40DT1D" PLC controller for a cut-to-length type of application. for the measurement of length, I am using an inbuilt high-speed counter 0. Now the problem, when the status of PLC changes from Power off to Power On the high-speed counter starts from 0. How to hold the pulse value of HSC0 at power restart ? (I am using Differential Rotary Encoder, not absolute)
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Hi: I need to change an old PLC with NX1p2 to control 3 servo motor by means of Analog Outputs couple with encoders, My job is to change the PLC only. So the servo drives and drivers are untouchable (No budget and involve too much mechanical works). I observed that Sysmac Sttudio Axes setting has this: Servo Axes, Encoder axes, Virtual Servo Axis and Virtual Encoder Axes. I believe the Encoder Axes couple with Analog Output is able to to do the Job? If so, what function block should i use? If no, do any body have a suggestion of any function block i can use? Thanks
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Hello Everyone, I am struggling with interfacing Incremental encoder with FX5U PLC, Does anyone have parameter setting and sample program for same. i am unable to fetch counts... Encoder: 500ppr, 24V line drive, A-B phase, PFA datasheet
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Hi all, I am taking a Kubler draw wire encoder back to a 1734-VHSC24 and having a little bit of an issue with the rollover. With the draw wire untouched the output value seems to be fluctuating over time and appears to be drifting backwards to the rollover value making our distance measurements completely useless. Does anyone have any insight as to why that might be? -
Hi, I can’t find an answer to the following and I was advised to ask it here.I’m programming an Omron CJ2M with an MD212 high speed I/O card. I usually do all my programming in Structured text, simply because I like it a lot over ladder or sft.Now, if I want to read the hight speed counter (incremental encoder), I have to make a ladder section and use the PRV instruction to store the present value in a chosen location.The manual says the current PV is stored in A271, but I can’t get a readout there. Apparently the only way to read it is through this instruction.Does anyone know if there is an equivalent to the PRV instruction for Structured text? or another way perhaps? Again, when I check the actual memory adress, there’s no value there withouth the use of the PRV instr.
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Hi guys. I have a new SRM50-HAV0-K01 sick encoder for my ELAU servo motor (model: ELAU sm 070-60-010-P0-45-M1-B0), and need to program it according to an old one (which seemingly is broken) via hiperface. device: PGT-11-S LAN software: SOPAS 2018.3 build 4.1.1.324 (Vm version 1.8.0_73) I tried to find any certain way for programming of sick encoders on the net using the mentioned device and software, but cant. all is only about datasheet or how to use teh software without an specific instruction. I am not even sure of that the old one is broken, except that in the analysis mode of the SOPAS (entering via hiperface) I can see the the sin-cosin graph out of its limitation line. The thing is I have bought a special tool which has not any specific instruction and SICK group does not reply any exact instruction for my issue. Here is my questions: How can I program the new encoder just according the old one? And how can I assure that the new one programmed just as the old one? and what is the definite sign of a broken encoder? anyone experienced?
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Hi Guys! There is a task. I have a motor, and I can monitoring the actual speed. The question is how can I to determine the average speed, if I know just the actual speed. If the speed is zero, it must be ignored. So I have to measure when the motor moves. Anybody have any idea? How can I solve this problem. RSLogix 5000. Thank you.
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Hello, I have a NX1P2 controller that would control a DC motor, currently it's open loop. I can control the speed and the direction. I'd like to add an encoder to it. The motor I have is from MidWest motion S27 series and they told me I can use their encoder but the problem is it output TTL My question is, how do I read this encoder output in the PLC since it's TTL? Second, is there a high speed counter in Sysmac Studio for the PLC I have? Thank you everyone in advance
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I am trying to connect a Delta ASDA-A2 Servo internal motor encoder to a Delta DVP28SV high speed counter input. I was successful in connecting the servo to the plc on position mode with an external encoder connected to PLC high speed counter. Currently having trouble in finding the correct wiring between the servo drive and the plc to count the pulses from the internal motor encoder. Attached are some figures from the servo drive manual. OA --> X0 is obvious, tried s/s to GND, COM-, VCC and VDD... no result. Any suggestion would be highly appreciated.
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I am looking to replace a SIC Hiperface encoder with a standard 1024 encoder. I see how to change the protocol here but am wondering what else I would have to change. Thanks for your help! -
Hello Everyone, I am struggling with interfacing Incremental encoder with FX5U PLC, Does anyone have parameter setting and sample program for same. i am unable to fetch counts... Encoder: 500ppr, 24V line drive, A-B phase, PFA datasheet Hollow Shaft encoder.pdf
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Hello Everyone, I am struggling with interfacing Incremental encoder with FX5U PLC, Does anyone have parameter setting and sample program for same. Encoder: 500ppr, 24V line drive, A-B phase,
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Hey guys, I am working on an application that tracks irregularly spaced PET bottles on a conveyor line and then blows them into boxes waiting on the side of the conveyor. I believe I have working logic, but I am having issues with the encoder at operating conveyor speeds. I believe the best logic for my project is to use a photoeye to detect the presence of a bottle (a one-shot makes sure it is only detected once), and then "store" the "presence" of the bottle in a binary file using an encoder pulse to trigger a BSL function. Using this logic, the bits in the file are analogous to a real, physical location on the conveyor, and I can just monitor specific addresses in the file where my real-world air nozzles are located. My current problem is that as my conveyor speeds increase, the PLC begins to miss pulses from the encoder. During my initial set-up, I took data at very slow speeds to experimentally determine how many pulses were between the photoeye and each air valve, but when I run at full speed, I only detect about 70% of the pulses detected at slow speeds. Not good. Althought the "skipped pulses" seem to be proportional to the detected pulses at slow speeds. I am using an encoder that only runs at 60ppr, so I would think that my PLC (MicroLogix 1200) can handle this...I did the math before I purchased the encoder and thought I found the pulses to be infrequent enough that the PLC wouldn't miss any. My 2 trains of thought: 1) I need to use an interrupt for each encoder pulse since they occur so quickly (utilizing an EII), which I am not fluent in. I can find instructions to intitially configure the EII file, but I am unsure of how you are supposed to correctly set up the ladder logic to utilize the interrupt. 2) There is an electrical issue. The encoder I bought uses pull-up resistors. The resistor value I selected only drops the detected voltage to 14V from 24V. Is it possible that the encoder does not spend enough time in the "off" state at high speeds because of this high voltage value? OR does the usage of a resistor introduce a time-lag into the system which further complicates the issue? Any help would be appreciated, Thanks!
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I want to use an incremental rotary encoder with my Allen Bradley PLC to move induction motor (3 Phase) in clockwise and anticlockwise direction.Please help me with the program how to use High Speed Counter Values to move motor reverse and forward. -
Hello everyone!I have strange problem.I have plc, inverter (mitsubishi), incremental encoder (sick) and motor.When i set the frequency on the inverter about 1,5Hz, the plc correctly counts impulses, but every higher frequency causes the plc counts impulses incorrectly or doesnt count. Above described things are happening at the rotation of motor in the forward direction. With a rotation of the motor to the rear, high-speed counter doesn't count the impulses.All the parameters of high-speed counters and PLC program i am sure there are right ( i'm using only instruction to start high-speed counting (HIOEN) and to enable interrupt (EI). Input Response Time i had on "No setting" or 10micro-s and nothing.Type of encoder - A/B phase, HTL.PLC - FX5UPLC program - Gx works 3.Maybe somebody had similar problem? Maybe somebody could tell me where i need to look for the solve? Thanks for help :)
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Do I need an encoder (slave) axis for my project? I am using a Powerflex755 and Incremental Rotary Encoder (scaled into linear movement axis)... Any other suggestions would be GREATLY APPRECIATED!! project file https://sites.google.com/site/lyncedrgb/eva/untitledpost-2/StellaPLC.ACD
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Hello All! This is my first post so please give my descriptions some lee-way please:P I am having trouble finding a solid example of ladder logic which integrates a: PowerFlex (755 in this case) Rotary Incrematal Encode ( or any encoder for that matter) A Prox to reset the resolution at specific points along the axis Also, can I use the standard Motion Instructions (MAJ,MAS,MAM etc) to control the movement sequences of the PowerFlex or are they only meant for use with Servos? I am working on automating a Lumber Treatment Process. The movements will have to move tens of thousands of pounds.. Therefore I would like to use the PowerFlex as a Torque Limiter to control a 15HP squirrel cage motor on a massive gear reduction. I have the distances and pulses per distance traveled from the mechanical engineering guys.. I'm just having problems integrating! After using the Setup Wizard for PowerFlex how can I go about actually inserting movement instructions for the drive into my ladder logic? Some more info on different movement profiles.. I've also included my attempt at trying to piece this together thus far.. Any input would be welcome! (StellaPLC) https://sites.google.com/site/lyncedrgb/eva/rslogix The actual drive and PLC are not available to be me at this time.. could this be an issue while trying to write this motion control program? (obviously not testing & troubleshooting portion) Tugger Speeds Freq. ACCEL TIME DECEL Time E-Stop Decel Torque % of max Notes VERY SLOW 15HZ 0.5s 0.5s 0s 100 SLOW 30HZ 1s 1s 0s 100 Restricted to slow speed within 3m of ends of transfer deck HAUL 60HZ 5s 5s 2.5S 100 Max torque limit 250% of FLA EMPTY TRAVEL 120HZ 2s 0.5S 2.5S 30 Torque Limited to 25%
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Hi, I am planning to use an encoder on a CP1L to read on the RPM of a spinning wheel. For this, I can use high-speed counter 0, and the PRV2 instruction. My problem is that I also need the rotation direction. I was wondering if anybody had a tip for this? Thanks
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i am working on CTL (online cutter)i am using fx3g plc with 1024 ppr encoder i want to calculate MPM(METER PER MINUTE) in real time with the encoder can some one help me with the logic and how encoder work in frequency mode
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Hi Everyone, I have a PowerFlex 525, in Velocity Mode with a Encoder Card "25-ENC-1". We are controlling this drive via TCP/IP with a 1769-L32. Through the PLC if I try to toggle the Bit for "Pos Redefine" in A560 [Enh Control Word] it instantly turns back to 0. But through the Parameter List Editor I am able to toggle A560. For My function I need to have the drive in Velocity Mode, If I change the drive to Position Mode I am able to toggle "Pos Redefine" Any Thoughts would be great
