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It is a device used to sense the temperature within the motor coils. There are usually three in a three phase motor, one for each coil. The output of the thermistor is used to hold an over temperature relay designed to be used with thermistors, in a closed position. The start circuit of the motor control is connected thriough this relay through N.C. contacts. If the motor goes into a over heat condition then the control relay drops out, the contacts of the relay open which in turn de-energizes the magnetic contactor and disconnects the motor from the supply voltage.
What else can I help you with?
How do you tell if a faulty thermistor?
While some people use a much more exhaustive and precise testing procedure, a very simple test can uncover the most common problems with a thermistor: * measure the resistance of the thermistor at room temperature with an ohmmeter. If this resistance is 0 (short) or infinity (open), then something is connected incorrectly or the thermistor has been destroyed. (These are the most common problems). If that test looks good, then a followup test can uncover nearly all the remaining possible problems with a thermistor: * put icewater in a ziplock bag and press it against the thermistor. Then measure the resistance of the themistor at freezing. The two measured values of resistance are usually adequate to identify what kind of thermistor it is. If both values are practically the same, then it's not really a thermistor -- perhaps someone has accidentally substituted a resistor. If one or both values are not the expected values, perhaps someone has accidentally substituted a different kind of thermistor.
Is potentiometer and Thermistor are variable resistors. How please explain?
A: A potentiometer is a manual device to change the resistance A thermistor changes as a function of environment temperature
What does a thermister do in a circuit?
A Thermistor Is essentially a variable resistor. The resistance of the thermistor changes with temperature. They're often used to regulate heating elements - like those found in cookers.
How do you test motor thermal protection relay?
The thermistor motor protection relays CM-MSE, CM-MSS and CM-MSN are used to control motors equipped with PTC temperature sensors. The PTC temperature sensors are incorporated in the motor windings to measure the motor heating. This enables direct control and evaluation of various operating conditions. Depending on the products also ATEX approvals for use in hazardous areas are available.
What is advantages of thermistor?
A thermistor an electrical resistor that resistance changes with temperature. There are two advantages of a thermistors one is it been more sensitive that the RTDÕs and thermocouples and two is has a quick response time.
What is the symbol of thermistor?
The symbol of a thermistor is a resistor with an arrow pointing towards it.
Do all motors need a thermistor?
Not all motors require a thermistor. The need for a thermistor depends on the application and the specific motor design. Thermistors are often used in applications where temperature monitoring is critical to prevent overheating and ensure optimal performance, such as in high-power or continuous-duty motors. However, many smaller or less demanding motors operate effectively without temperature monitoring.
What kind of thermometer has a thermistor at its end?
A RV absorption refrigerator uses a thermistor as a thermostat. The thermistor is moved up or down to regulate the refrigerator temperature.
Where is the blower fan thermistor on a 2002 Lincoln town car?
On a 2002 Lincoln Town Car, the blower fan thermistor is typically located in the blower motor assembly. It is often positioned within the air duct or near the blower motor itself to accurately measure the temperature of the air being circulated. Accessing it may require removing the blower motor or the dashboard panel. Always consult a repair manual for specific details and procedures.
How can I test a dryer thermistor to determine if it is functioning properly?
To test a dryer thermistor, you can use a multimeter to measure its resistance. Disconnect the thermistor from the dryer and set the multimeter to the resistance setting. Place the multimeter probes on the thermistor's terminals and check the reading. Compare the reading to the manufacturer's specifications to determine if the thermistor is functioning properly.
What is the relationship between the resistance of a thermistor and temperature?
The resistance of a thermistor decreases as the temperature increases.
How could you change the resistance of the thermistor?
You can modify the resistance of a thermistor by changing its temperature. As the temperature increases, the resistance of a thermistor decreases, and vice versa. By adjusting the surrounding temperature or applying heat or cooling, you can effectively change the resistance of the thermistor.
Is the resistance of a thermistor measured in degrees celsius?
No, the resistance of a thermistor is typically measured in ohms. The relationship between the resistance of a thermistor and temperature is nonlinear, and it is used to calculate the temperature of the thermistor in degrees Celsius.
What happens to a thermistor as it gets colder?
As a thermistor gets colder, its resistance increases. This is because the material in the thermistor contracts, reducing the number of charge carriers available for conduction, hence increasing resistance.
What is thermoresistive?
A thermistor is thermoresistive.
When the temperature increases thermistor resistance decreases?
Yes, that's correct. In a thermistor, which is a type of temperature-sensitive resistor, the resistance decreases as the temperature increases. This is because the conductivity of the thermistor material increases with temperature, causing the resistance to decrease.
What does a thermister do and how does it function in a circuit?
A thermistor is a type of resistor that changes its resistance with temperature. In a circuit, a thermistor is used to measure temperature by detecting the change in its resistance. When the temperature changes, the resistance of the thermistor changes, which can be measured and used to determine the temperature in the circuit.
