In today’s manufacturing world, wherever you find an electric motor, to drive and operate that motor, you will always find an electric contactor. A contactor can be said simply as an electrically controlled switch, also called a relay that is utilized for switching a power circuit. In such a way it is designed that the generated magnetic field, whenever through a coil built into the contactor sufficient current flows, it results in the pulling of the contacts. The contacts even operate as the switch. In two popular configurations contactors are designed and built, single-phase (or single pole), and three phases (three poles). This designation only clears the number of circuits that can be operated simultaneously. In operating the contacts the coil is the main means. With an appropriate voltage when it is energized, it starts generating enough magnetic force to pull the contacts into a closed position or close the power circuit. Spring pressure returns the contacts into the open position only when the coil circuit is opened as a result there is an opening of the power circuit. A failed coil is the most common issue with a Fuji magnetic contractor. This would fail the contactor to energize when voltage is being applied to the coil. In two ways it can be tested, first in a power-on situation, as to whether the coil is energizing or not a check of the voltage at the coil terminals should give a definite answer. On contactors with overload resets if you do not read the appropriate voltage directly from the coil terminals you'll need to check the overload circuit of the magnetic contactor for the failure or an open circuit. You will find the need to verify the voltage with the label or nameplate on the coil too. Any moderate resistance will usually indicate that the coil is conducting electricity and an open circuit (or high resistance) would signify an open coil. Within the coil, a reading of 0 ohms would indicate a short circuit but this is very rare as energizing a shorted coil usually results in excess heat and current.
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Meba Electric Co., Ltd is a professional manufacturer and supplier of highly designed and premium quality electrical appliances. We always focused on developing our capacity and increasing the efficiency to compete in the current market. Archives
April 2024
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