In a food factory, a production line is used to package food canned. The production line is made up of several machines, such as a filling machine, a labeling machine, a sealing machine, among others. The filling machine is equipped with a 5 HP three-phase electric motor and is powered by a 240 V three-phase power supply. The machine is protected by an overload relay thermal switch that is configured to protect the motor against electrical overloads. One day, during the normal operation of the production line, a jam occurs in the machine filler. As a result, the electric motor begins to draw more electrical current than normal to try to overcome the jam. The thermal overload relay detects the increase in electrical current and, after a certain time, activates the disconnection mechanism to protect the engine from damage. After clearing the jam, the operator restarts the electric motor. Like overload relay thermal is still in activation state, it does not allow the engine to start, since it is still detects an electrical overload. At this point, the operator realizes that there is a problem. and turn off the power of the filling machine. After a few minutes, the Thermal Overload Relay cools down and resets to its normal state. The operator can restart the machine and resume production. Students should analyze this case study and answer questions: 1. What is the function of the thermal overload relay in this machine? 2. Why did the thermal overload relay prevent the motor from starting after it was switched off? did you solve the jam? 3. How can you prevent this type of situation from happening in the future?
CASE #2:
In a food factory, a production line is used to package food
canned. The production line is made up of several machines, such as a filling machine,
a labeling machine, a sealing machine, among others.
The filling machine is equipped with a 5 HP three-phase electric motor and is powered by a
240 V three-phase power supply. The machine is protected by an overload relay
thermal switch that is configured to protect the motor against electrical overloads.
One day, during the normal operation of the production line, a jam occurs in the machine
filler. As a result, the electric motor begins to draw more
normal to try to overcome the jam. The thermal overload relay detects the increase in
electrical current and, after a certain time, activates the disconnection mechanism to
protect the engine from damage.
After clearing the jam, the operator restarts the electric motor. Like overload relay
thermal is still in activation state, it does not allow the engine to start, since it is still
detects an electrical overload. At this point, the operator realizes that there is a problem.
and turn off the power of the filling machine.
After a few minutes, the Thermal Overload Relay cools down and resets to its normal state.
The operator can restart the machine and resume production.
Students should analyze this case study and answer questions:
1. What is the function of the thermal overload relay in this machine?
2. Why did the thermal overload relay prevent the motor from starting after it was switched off?
did you solve the jam?
3. How can you prevent this type of situation from happening in the future?
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