Motive protection protection principle and function ◠Overload protection ◠Underload protection ◠Stall protection ◠Blocking protection ◠Overheat protection Overload protection When the motor is overloaded for a long time and exceeds its rated current, it will cause the motor to overheat and the insulation will be reduced and burned. The protector calculates the thermal capacity of the motor according to the heating characteristics of the motor and simulates the motor heating characteristics to the motor. Protection, overload protection Different trip levels correspond to features Underload protection When the load on the motor is a pump load, the motor will be in no danger of no-load or under-load operation. The protector provides under-load protection when the percentage of the three-phase average current and rated current is lower than the set value. The protector should act within the set time of the action (delay) or alarm within the alarm time. Blocking/blocking protects the motor when it is starting or during operation. If the motor is stuck due to excessive load or mechanical reasons, failure to remove the fault in time will cause the motor to overheat and reduce the insulation and burn the motor. Stall protection is suitable for the protection of the motor starting from such failures. The blocking protection is used to protect the motor during operation. When the current reaches the set current, the protector should be set in the action (delay). Action within the time or alarm within the alarm time. ? Open-phase (unbalanced) protection The open-phase (unbalanced) fault has a great harm to the motor during operation. When the motor is open-phase or the three-phase current is seriously unbalanced, the protector is used if the unbalance ratio reaches the protection setpoint. Protect according to the set requirements, send a stop or alarm command to make the motor safer. The ground/earth leakage protection protector also has ground protection and leakage protection. The grounding protection current signal is taken from the vector sum of the internal current transformers, which is used to protect the short circuit protection of the phase wire of the motor metal housing. The protector can detect the fault current of 30mA~50mA by adding the leakage transformer and it is mainly used for indirect Grounding protection to ensure personal safety. • External fault protection When the protector detects an external fault, the protector is protected according to the set requirements when the external fault digital input and the digital input defined by the protector are inconsistent, ensuring the safety of the motor equipment. ? Start overtime protection In the process of motor starting, the protector only has the protection function of phase failure (unbalance), ground/earth leakage, and other protection functions will not work. After the start, all protection functions (according to user settings) are Automatically input, when the motor start time exceeds the user set start time, the current is also greater than 1.1 times the rated current, the protector is protected according to the set requirements, and a stop command is issued within the set time of action (delay) to stop the motor running. . Phase sequence protection The protector with phase sequence protection function, when the voltage phase sequence of the power supply side is consistent with the set sequence, the protector should not operate. When the protector detects that the phase sequence of the motor d is wrong, the motor should not start. Undervoltage protection voltage is too low will cause the motor speed to reduce, or even stop running, when the motor running voltage drops to the set undervoltage protection range, the protector protects according to the set requirements, set in the action (delay) Action within a time or alarm within the alarm time to avoid confusion caused by important production processes and seriously affect production. Overvoltage protection voltage is too high will cause damage to the motor insulation, when the motor operating voltage exceeds the set protection voltage, the protector is protected according to the set requirements, action (delay) within a set time action or at the alarm time Internal alarm to ensure the safety of the motor equipment. Under-power protection motor loses mechanical output capacity due to damage to the transmission device. Under-load operation, the motor power factor is low, but the motor current is large, and the reactive power of the system is consumed in large amounts, when the percentage of load power and rated power is lower than When setting the action value, the protector will act within the set time (action delay) or alarm during the alarm time. Overheat protection overheat protection Mathematical method to establish the heating model of the motor, from the principle of solving the heat of the low voltage motor Automotive Air Conditioning Compressor High And Low Pressure Plastic Connectors Shenzhen Capitol Micro-Electronics Co.,LTD , https://www.capitolgtms.com
â— Phase sequence protection â— Undervoltage protection â— Overvoltage protection â— Underpower protection â— Start overtime protection
â— Phase failure protection â— Unbalance protection â— Ground protection â— Leakage protection â— External fault protection 