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Showing results for tags 'synchronize motors'.
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Hartech posted a topic in CX-ProgrammerHello, I need to Synchronize two 4kW motors connected to their own individual AltiVar VSDs. To put it simply the two motors are pulling cables on a pulley and when loaded the motor's slip and the speed varies. I have an Omron CP1L-EM PLC and 2x Omron Rotary Encoders ( E6C2-CWZ5B encoders - 360 PPR) - connected to each motor, What is the best way to read the pulses from the two rotary encoders then convert to RPM? 1) Using PRV or PRV2(883) instruction, - this would be the best option as it would convert the value to RPM - however, can I use this instruction on both Counter 0 & Counter 1? 2) Or read the raw value from Counter 0: A270 (connected to motor one's encoder) Counter 1: A272 (connected to motor two's encoder) Convert the pulses to RPM - then compare and adjust? 3) Or using CTBL. - is this a useful instruction for this application? Once I get the RPM speed from each motor - I can then do a compare instruction - see if there is a mismatch and if so send a scaled analogue output to the VSDs to correct the speed if required. (10-50Hz) What would be your recommendations? any help would be most helpful. Thank you.
Greetings, We (in the steel industry) have many pumps / motors (large and small). Generally we use soft-starts, cross-line starters (E3+) or even Flex drives. There may be several motors in a pool to start where we need only say 2 of 3 to be running at any one time When it's time to start them, we may need to stagger start them, if one fails, the spare may need to start. My question to the group is... Are there any philosophies out there (and hopefully pseudo or actual code) as to how to start a subset of motors/pumps within a pool of motors and maintain the configuration running ? I appreciate any and all comments. David
Hi, I am tasked with doing some research for our company. (automation / controls ) and wondered if anyone here might know of a resource to find out what platforms they are using at the various GM plants. I'm looking for the Process PLC / Safety PLC / HMI software. Much thanks,