????????Instagram: /genesisgenharia10 As its name suggests, the main condition for activating this relay is the lack of phase. There are also other conditions for activation, such as: *The inconsistency of a phase; *The wrong sequence of phases (when the relay has this function); *The asymmetry of the phase angle; *The voltage above or below the maximum or minimum limit, respectively Lack of neutral (if any). All these conditions give it the deserved classification of a protection device. Phase Loss Relay: Composition The composition of the three-phase phase loss relay is based on electronics together with magnetism! This device has as main elements: An Electronic Phase Monitoring Circuit A Microprocessor An Internal Relay A Switch Contact Switch Contact Understanding contacts is very important, not only for you to be able to understand how the phase loss relay works, but also to increase your knowledge and make you better interpret electrical control diagrams, for example. The changeover contact is a contact that performs switching between an open contact and a closed contact, that is, it has the function of both contacts: NO contact, which is the contact that is normally open and closes when energized. NC contact, which is the contact that is normally closed and opens when energized. Because it provides both functions, the changeover contact is widely used in relays and not in contactors. Weg Relay RMW17-FF01D97 Phase Loss 1NO/NC 380-480V = Intended for monitoring three-phase systems against phase loss. It is connected directly to the 3 phases, terminals L1, L2 and L3 in the electrical network to be monitored. The output relay switches the contacts to the operating position (closing terminals 15-18) and the red LED (relay) and green LED (power supply) will turn on. Adjust the line voltage sensitivity. If one of the phases drops to a value below the percentage limit set on the adjustment selectors, the coil output contacts will be de-energized, opening contacts 15-18 and the red LED will turn off. FF01 OLD FFS01 Altronic Three-Phase Phase Loss Relay without Neutral 220 to 380V FF 01 FFS- PHASE LOSS WITHOUT NEUTRAL: When energizing the phases in L1, L2 and L3, terminals C-11 and NA-14 are closed. The red LED being on indicates that the relay contact is on and we also have a sensitivity adjustment of the voltage level. This relay has a sensitivity adjustment of 15 to 30% of the nominal voltage value COEL - BVF - RELAY THAT SUPERVISES PHASE LOSS 1-General LED on: indicates that the relay is energized 2-Relay LED on: indicates that the relay is activated, that is, the input voltage is within the adjusted parameters. The relay considers a phase loss if the voltage is below 88% of the nominal voltage. The phase loss relay has a very interesting operation! It is used most of the time to protect three-phase electric motors, mainly because it has a fast and precise action. This feature is very important because three-phase motors need all three phases to operate, that is, if one of them is missing there is a high risk of the motor burning out. When one of the phases is not detected by this electronic circuit, a microprocessor powered by a voltage reduced by a resistor sends a signal that causes the internal relay to activate and switch the contacts. The phase failure relay releases the power for the operation of the contactor connected to it as soon as the NO contact closes, causing the power supply to the NC contact to be cut off. It is recommended that the NC contact be connected to a fault warning LED or a siren.