chocolate temp 2

Summary

In this tutorial, the speaker walks through a troubleshooting and programming process for a chocolate temperature control system. They explain how to adjust sensor readings and calibrate the temperature for correct operation, using analog signals. After resolving issues with the temperature readings, the speaker guides viewers on modifying the cooling and heating valves to match accurate thresholds. The video also introduces the concept of controlling motor speeds with a Variable Speed Drive (VSD) by using analog inputs and outputs, setting the stage for future programming challenges involving motor speed control.

Takeaways

• 😀 The temperature sensor is currently set to 0°, which causes confusion due to incorrect scaling.
• 😀 The heating valve is turned on when the temperature is below 60°, which is expected behavior.
• 😀 The number 60 used in the script doesn't actually represent 60° but 60 parts of 4095, which is incorrect.
• 😀 To calculate the correct temperature representation, you need to divide 60 by 4095, then multiply by 100, which results in 1.46°.
• 😀 The correct temperature number for 60% of 4095 is 2457, which represents 60°.
• 😀 The cooling valve operates based on a similar principle, with 70% of 4095 being equivalent to 2866.5.
• 😀 The sim now behaves correctly: when the chocolate temperature is below 60°, the heating valve turns on, and above 60°, it turns off.
• 😀 If the chocolate temperature exceeds 70°, the cooling valve activates to cool the tank.
• 😀 The program needs to be saved as 'chock temp Cool' after these fixes to the temperature logic.
• 😀 The client also requires the installation of a variable speed drive (VSD) to adjust the mixing motor's speed using an analog input.
• 😀 An analog output will be needed to send the speed reference to the VSD, which will control the motor speed.

Q & A

What was the initial issue with the temperature sensor in the system?

The initial issue was that the temperature sensor was reading 60 as a temperature, but it didn't actually represent 60°C. Instead, the value 60 represented a fraction of the total range (4,095 parts), which incorrectly gave a temperature of 1.46°C, much lower than expected.

How was the temperature value of 60 corrected?

To correct the temperature value, the formula was adjusted to represent 60% of the total range (4,095). By calculating (60 / 4095) * 100, the actual temperature represented by 60 was found to be 1.46°C. The correct value was then recalculated as 2,457, which represents 60°C.

What does the number 60 represent in the script and why is it significant?

In the script, the number 60 initially represented 60 parts out of the total range of 4,095. It is significant because it was used to control the temperature activation of the heating valve, but the representation was incorrect, leading to an erroneous temperature reading.

How is the value for 70°C calculated in the script?

The value for 70°C is calculated by finding 70% of the total range (4,095). The formula used is (4,095 / 100) * 70, which equals 2,866.5. This is the value that represents 70°C for the cooling system.

Why was the formula used for the temperature sensor incorrect initially?

The formula was incorrect because the temperature sensor was designed to detect values as parts of a total range (0 to 4,095), not in degrees Celsius directly. This led to confusion and incorrect temperature readings, which were then corrected by recalculating based on the sensor's full range.

What does the term VSD stand for, and what is its role in the system?

VSD stands for Variable Speed Drive. It is an electrical device used to control the speed of a motor. In this case, the client wanted to adjust the speed of the mixing motor by using an analog input and output system to control the motor speed via the VSD.

How does a VSD work in the context of the mixing motor control?

The VSD works by receiving an analog signal, which adjusts the speed of the motor accordingly. The analog input is controlled via a dial (or slider), and the VSD adjusts the motor speed based on the reference value sent from the analog output system.

What is the purpose of the analog input and output in the VSD setup?

The purpose of the analog input is to allow the user to adjust the motor speed (by turning the dial), while the analog output sends the adjusted speed value as a reference to the VSD, which then alters the motor speed accordingly.

What is the next step after correcting the temperature sensor values?

After correcting the temperature sensor values, the next step is to program the system to control the motor speed using an analog output, which will send a reference speed value to the VSD to control the speed of the mixing motor.

Why is it important to properly scale the temperature sensor readings in this program?

It is important to properly scale the temperature sensor readings to ensure that the heating and cooling systems activate at the correct temperatures. Incorrect scaling would lead to improper activation of the heating and cooling valves, potentially damaging the system or producing incorrect results.