ksd301 temperature controller: The purpose of choosing motor protection device

The temperature switch is on at low temperature. When the temperature rises to the operating temperature of the temperature switch, the temperature switch is off. The temperature switch switches on when the temperature drops below the operating temperature.

When using the temperature switch, the operating temperature should be the same as the "maintenance" temperature of the electric heater. For example, the operating temperature of the kettle can be selected as the 100℃ temperature switch. In addition, the rated voltage and current marked by the temperature switch should be slightly greater than the voltage and current of the electric heater. Install the temperature switch as close as possible to the part where the heater needs to reach the "maintenance" temperature.

Test the temperature switch is good or bad, can use the resistance of the multimeter, the two pens of the multimeter are respectively connected to the two pins of the temperature switch, at normal temperature multimeter display resistance value is basically 0. Then use a hot electric iron (more than 20 W soldering iron can be) to heat the metal shell of the temperature switch about 2 ~ 3 min (reach the temperature switch action temperature) temperature switch ring, at the same time the multimeter display resistance value should be infinite. Take away the electric iron, until the temperature of the temperature switch drops, and can hear a ring, at the same time the multimeter display resistance value is zero. It's good to have a temperature switch that changes like this. If the two leading wires of the multimeter resistance temperature switch are disconnected; Or to measure the time pass, and to heat the temperature switch for a long time, the temperature switch is constantly, such a temperature switch is bad.

The ideal motor protector is not the most functional, nor the so-called most advanced, but should be the most practical. So what is practical? The utility should meet the factors of reliability, economy, convenience and so on, with a higher performance-price ratio. So what is reliable? Reliability should first meet the reliability of the function, such as over current, phase break function must be a variety of occasions, a variety of processes, a variety of ways to occur over current, phase break can be reliable action. Secondly, its own reliability (since the protector is to protect others, especially should have high reliability) must have the adaptability to a variety of harsh environment, stability, durability. Economy: The use of advanced design, reasonable structure, professional, large-scale production, reduce product cost, bring high economic benefits to users. Convenience: Installation, use, adjustment, wiring, etc. must be as simple and convenient as possible.

The purpose of choosing the motor protection device is not only to give full play to the overload capacity of the motor, but also to avoid damage, but also to improve the reliability of the electric drive system and the continuity of production. In the case of meeting the protection requirements, the most simple protection device should be considered first. When the simple protection device cannot meet the requirements, or the protection function and characteristics put forward higher requirements, the application of complex protection devices should be considered, so as to achieve the unity of economy and reliability. The specific function selection should be based on the comprehensive consideration of the value of the motor itself, the load situation, the environment is good or bad, the importance of the motor, whether the exit operation has a serious impact on the production system and other factors, and strive to achieve economic and reasonable.