Description
Protect the self-start of important motors
When the power supply bus voltage of the motor is reduced for a short time or interrupted and restored, in order to prevent the motor on the line from starting at the same time to seriously reduce the power supply voltage, it is usually installed on the secondary motor low voltage protection. When the power supply bus voltage is low to a certain value, the low voltage protection action, the secondary motor will be cut out, so that the power supply bus voltage to restore enough voltage, to ensure the self-starting of the important motor.
Ensure technical safety and process characteristics
In some cases, when the voltage disappears for a long time (such as 10S or so), some motors need to be removed according to the technical safety conditions and the characteristics of the production process. Because during this time the boiler was dead Off, self - boot is no longer necessary. In order to ensure the process interlocking action, a low voltage protection action should be installed in case of tripping. In addition, there are some mechanical motors with constant resistance moment, such as coal mills, etc., in Self-starting is not possible when the voltage drops, and these motors should also be cut off when the voltage drops.
Main brands include: ABB, Bailey, GE, FOXBORO, Invensys TRICONEX, Bentley BENTLY, A-B Rockwell, EMERSON EMERSON, B&R, MOTOROLA, FUANC, REXROTH, KUKA, HONEYWELL, NI, DEIF, Yokogawa, WOODWARD WOODWARD, Ryan, SCHNEIDER SCHNEIDER, Yaskawa, MOOG, EPRO, PROSOFT and other major brands
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