Pt100 resistance is a linear negative temperature effect coefficient for thermistor resistance. Its zero resistance value is 100 ohms. When the temperature changes by one degree in China, its resistance value is stable.MotorAn electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction.Explosion-proof motor is a kind of motor that can be used in flammable and explosive plants, and it does not generate electric sparks during operation.Explosion-proof motorsMainly used in coal mines, petroleum and natural gas, petrochemical and chemical industries.In addition, it is also widely used in sectors such as textiles, metallurgy, city gas, transportation, grain and oil processing, papermaking, and medicine.Frequency conversion speed motorA general term for motors driven by frequency converters.In fact, the motor designed for the frequency converter is a special frequency conversion motor. The motor can achieve different speeds and torques under the drive of the frequency converter to adapt to the changes in the demand of the load.
PTC is a thermistor with a positive temperature coefficient. Its resistance increases with increasing temperature, and its resistance jumps at the Curie temperature point.
Discordant.Both are due to thermal resistance, which changes with temperature.But the functions and uses of the two are different. Ptc is an abbreviation of positive temperature coefficient, a thermistor whose resistance value increases with temperature.This thermistor is widely used in maintenance circuits.If a ptc thermistor is installed in the maintenance circuit, when the temperature around the thermistor rises to a certain temperature critical point, the thermistor value will become very large, thereby blocking the circuit. When the temperature drops, it will Automatically resume dormancy to protect the entire circuit from damage.In pt100, pt is the symbol of platinum. 100 means that the resistance value of pt100 at 0 degrees is 100 ohms. Pt100 is made of a resistance temperature sensor that uses platinum to change the temperature and the resistance value behaves differently.Usually used in the temperature range of minus 200 to 650 degrees.The sensor is usually used together with a temperature controller, but it only detects temperature changes and has no control effect.
First: The PTC thermistor is not directly connected to the PLC. The PLC is actually connected to a temperature switch, normally open and normally closed points. When the temperature rises to the temperature threshold switch, the temperature switch will act, and the switch input to the PLC When the signal is to suspend motor control or decelerate, the temperature switch is usually installed around the motor winding and the winding coil.
Second: The use of PT100 at the bearing of the motor. PT100 is generally connected to the temperature controller, used to develop the bearing working temperature, and is installed at the support of the bearing or bearing bush.
Third: Why use PTC winding, and PT100 bearings?Winding PTC is to maintain the high temperature of the motor windings from being burned. When the temperature reached, it must be worth hanging directly, and generally alarm; and the PT100 bearing is used to control the speed of the motor according to the temperature, and can show the actual temperature value.
Fourth: The PT100 at the bearing is pre-embedded, and the wire can be drawn from the surroundings. As for which junction box we connect to, it depends on which country and locality we use.
V: The principle of PT100 and PTC or something else. The principle of PT100 and PTC is the same, but the thermal curve is different.
