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Showing results for tags 'frequency'.
Found 4 results
sine wave generation for frequency tests purpose
ILC_H posted a topic in Allen Bradley / Rockwell AutomationHallo everyone, i have a logix5561 PLC wich control a pumpsystem. The Pump is driven by a linear Motor. I need to perform frequency tests on the system. So first of all i want to know how i can generate sine wave with this controller? I google it but didn't find any valuable information. Can i perform such tests without additional hardware? thanks for your replys!
Continuous sine wave problem
plat933x posted a topic in MitsubishiHi, I encountered specific problem during work with PLC&HMI application. The main task of that system is controlling torque changes of induction motor with inverter&analog PLC output. There are few built-in functions to change torque: exponential, constant, trapeze and unlucky sine. All functions are implemented as array of 1500 values. When array reaches 1499 element, it comes back on first position and so on. It works without any problem for exp, constant, trapeze and sine wave with natural numbers of frequency e.g. 1Hz, 3Hz etc. The trouble appears when we want to control torque with float value of frequency and unfortunately its the most important part of that project. When the float value frequency is chosen, the last element of array is totally different than the first one. In result, in every period of array, appears drop of value. Check the attachments to comprehend what's going on. The first image shows GXWorks restriction of index. The second image shows how does it look on simulate screen, where it's representation of PLC registers D2000 - D3499. On third and fourth images you see values of registers in Device Memory Batch of GXWorks. Fifth image shows the script which I work on. Do you have any ideas how to implement float values of frequency in correct way? I should make an opportunity to online change of sine frequency in continuous way between 0 and 10 Hz, with 0.2Hz step. I will be very grateful for any advice. Greetings, J
RJorgensen posted a topic in For Sale, Employment, Services or WantedSelling the drives below. Rapid company expansion came to a halt and our vendor is not offering what we need for reimbursement. Prices shown are already wholesale rated, however, I'm open to negotiating. Numbers spaced between the model number and unit price are quantities that are being sold. Serial numbers can be provided to verify age, but these are all brand new-old stock. EMERSON M200-05400270A10101AB100 2 $ 715.00 EMERSON M200-04400135A10101AB100 34 $ 489.00 EMERSON M200-03400056A10101AB100 15 $ 363.00 EMERSON M200-02400041A10101AB100 1 $ 400.00 EMERSON M200-02400032A10101AB100 5 $ 258.00 EMERSON M200-02400023A10101AB100 4 $ 228.00 EMERSON M200-03400094A10101AB100 29 $ 402.00 EMERSON M200-06400420A10101AB100 3 $ 1,245.00 EMERSON M200-04400170A10101AB100 2 $ 543.00 Inquiries can be emailed to me directly at: firstname.lastname@example.org I'll do my best to answer any questions and have engineers on-hand to lean on for anything over my head.
allilou723 posted a topic in SiemensHi guys I Have Question of Propo variator converter that there kind of drives her PHASE IN (230v) AND Nature / OUTPUT TO THE ENGINE 3 PHASE (UVW)? -or if required entry 3 phase (RST) and output TO MOTOR 3 phase (UVW)? I would be happy to answer :)