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ADVICE 6

HOW TO PROTECT THE EQUIPMENT AT phase loss



DESIGNER TIPS





















 
   On the construction site is usually laid many temporary cables Wiring which is often done hastily and non-specialists. Wire connections do not run reliably. It also uses different, powerful equipment, such as welding, which is not designed males and wires. As a result, the joints become very hot, and the ends of the wires otgorayut and because of the lack of xcontact is lost in the network is one of the phases. In this case, for equipment that works for a long time continuously (Eg, pumps, fans, etc.), no one pays attention. Three-phase motors that are typically installed on this equipment, in the absence of one of the phases is not stopped and begin to buzz and hot. But it is often no one pays attention. As a result, they are burned. For protection (auto-off) equipment industry Special devices are available, but they are complex, unreliable and at the right time is simply not available. We use for this purpose a simple device, which in a few hours can be collected directly at the site. Schematic dixagram of the device you can see in the figure. You will need only two starter, and three buttons. Requirements for starters and buttons: xcontactor KM1 - Operating current shall not be less than the maximum current in the protected equipment. Coil at 380 V. 3 xcontacts - normally open to the operating current. 1 xcontact - normally open to any small current.                                  xcontactor KM2 - Operating current - any small current. Coil at 220 V. 3 xcontacts - normally open to any small current. Start Button - Normal Start button (NO) Key Training Network - Normal Start button (NO) Stop button - Regular Stop button (NC) You also will need two sets of terminals (terminals) on the 4-pin to maximum current of the equipment (for assembly into and out of Equipment wires and 4 bulbs at 220 V. And of course the metal box with a lid, in which all that stuff should be free to stay and there is enough space to access any and all xcontacts for electrical installation. TIP: Starters and button before installing the box should be necessarily tested for operation. This way you will get rid of unnecessary hassle when troubleshooting installation scheme. DESCRIPTION OF SCHEME: WARNING: Outside the neutral wire must be connected to the terminal N and connected to the body (metal box), which should be grounded! POWER: Apply power 3-phase 380 V to terminals A, B, C.  Push the button Training Network, powered Starter coil KM2. Closed xcontact KM2-1 and coil KM2 locked. Closed xcontact KM2-2 and prepared ON circuit coil xcontactor KM1. Closed xcontact KM2-3 and the lamp network ready. Click on the Start button, the starter coil is energized KM1. Closed xcontact KM1-2 and KM1 coil is blocked. Closed three major xcontact KM1-1, and the power is supplied to the xcontacts A1, B1, C1 on to the consumer. Light bulbs Phase 1, Phase 2 and Phase 3. OFF: Click on the Stop button. KM2 coil off. Break xcontact KM2-1. KM2 coil lock is lost. Break xcontact KM2-3. Network ready lamp goes out. Break xcontact KM2-1 and KM1 coil is de-energized. Break xcontact KM1-2. KM1 coil lock is lost. Break xcontact KM1-1 and power at the terminals A1, B1, C1 disappears. Consumer off. Lightning Phase 1, Phase 2, Phase 3 will go out. work with the loss of phase C: KM2 trip coil (this is equivalent to pressing the Stop button.) Work with the loss of phase A or B: Trip coil and break xcontacts KM1 KM1 lock-2. Break xcontact KM1-1 and power at the terminals A1, B1, C1 disappears. If the lost phase suddenly appear KM1 coil itself does not turn on. Inclusion is possible only by hand buttons and Start Training Network.
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