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The contactors up to 600 VAC are very cheap these days so there is not any need to use relays (they are used for low power signals mainly).
It is also possible to make a solid state contactor formed by two SCR connected back to back for each phase.
For 380 VAC you will need SCR´s rated for...
plc cheap
Hi, friends.
There is a new small PLC from the chinese factory Array, it cost me only 35 US dollars and has many interesting characteristics such as real time clock, function block programming.
Using any search engine the array´s webpage could be located.
For a three phase sofstarter you need the following:
Control section:
I have one sample program for an 8051 derivative so please pm me.
Power section:
1.- For each phase you need two SCR (or thyristor as you say) connected back to back so that they function as a controlled switch for the AC...
siemens step 7 software
Siemens has many programs and updates available for download, for example step7 v5.0 sp4 could be downloaded from the link:
h**p://www4.ad.siemens.de/WW/llisapi.dll/csfetch/2950274/SP4_STEP7_V50.exe?func=cslib.csFetch&nodeid=13559670
This is a functional version but for...
dc injection braking schematics
for safety reasons the dc injection brake must be energized after the main contactor is de-energized and only for a few seconds, the injected current should flow in two phases only. I have an schematic that uses one scr and one diode for this issue, if you are...
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