00:01UTC
00:11Okay, this time I'll be presenting the sequential starting of three-phase motors, for which I'll define some concepts before going on
00:18to programming in the DER and PLC1200.
00:26Now I will describe the programming used in DER 1.
00:30We are going to simulate this circuit to see how it works, which is a direct start; we have both the circuit here and the circuit.
00:36of force as the control circuit we go in simulation when pressing this will start the work sequence 2.
00:42By interlocking M1, it will activate the 2-millisecond activation timer T1, which will, after that time, activate
00:50the output Q0, 0 in set and a memory M2, 3.
00:54Contact M2 will activate the next 3-second timer T2, which will turn on output Q0, 1 in set
01:02and then it will set the output Q0, 0 to reset and call a memory M3, 4.
01:07Contact M3 will activate the next 3-second timer T3, which will turn on output Q0, 2 in set
01:15and then it will set the output Q0, 1 to reset and call a memory M4, 5.
01:20Contact M4 will activate the next 3-second timer T4, which will turn on output Q0, 3 in set
01:29and then it will set output Q0, 2 to reset and call a memory M5, 6.
01:34Contact M5 will activate the next 3-second timer T5, which will set output Q0, 3 to reset
01:43and the work sequence will end, 7.
01:45It may also be possible to have the press stop at a certain time.
02:01Direct starting of a three-phase motor is by far the most widely used starting method on the market because
02:06It is a simple, compact method with low initial cost.
02:10The equipment consists solely of a line contactor and a thermal or electronic overload relay.
02:16A major disadvantage is the high starting current, which is generally around 6 to 8 times the nominal current.
02:23but in some cases it can reach values up to 14 times the IN.
02:28In some cases, there may even be a peak in magnetization that can multiply the value by 20 times.
02:34nominal current.
02:36The exact value of the starting current will depend on the motor design.
02:40In general, in more modern motors the trend is for this current to be higher given the resistance of
02:46the windings are smaller.
02:47In a direct start, the initial torque is very high and in most applications it is much greater.
02:53to what is needed.
02:55This is a problem because it causes high mechanical stress on the transmission system, belts, couplings, and hoses.
03:02as in the cargo itself.
03:04Another disadvantage is that the only way to stop the engine is at a free stop, without control.
03:09In many cases this startup method works perfectly and is the most recommended, but sometimes it is necessary to resort to
03:16to other boot methods.
03:34What is a PLC? Well, it's a compact controller that facilitates the performance of simple production tasks, but
03:41high precision.
03:42Its design is scalable and flexible, across its 5 PUS, and reduces space requirements in the box.
03:49control.
03:49Because of this flexibility and adaptability, the software is easy to learn and use, with simple navigation thanks to
03:56that the symbols and menus are standardized across all views.
04:00With the S7-1200 controllers, productive tasks are compact, scalable, and flexible.
04:07This hardware is available in standard and security versions, and is scalable in terms of performance and equipment.
04:15With integrated IOS, integrated interface, Procinet for programming, MI connections, distributed IOS and distributed unit architectures,
04:23The S7-1200 device is highly adaptable to individual process needs, thanks to its signal modules.
04:31plug-in devices, as well as their communication modules.
04:44Well, that's all, thank you.
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