Electrical controls Flashcards
The electrical control systems consist of many components. These devices make up the complete control systems.
Electrical Control Systems
The Electrical Control Systems can be integrated with what?
Inputs, Hydraulic & Pneumatic power output controls
Electrical Control Systems
Electrical Control Systems have 5 features that its designed to do what are they?
*Safety devices prevent serious injuries.
*Input devices provide signals to the machine logic systems
*Logic Devices provide control management and regulation
*Power devices provide power output control and interface
*Control power supplies provide different voltages required by the control system, it can directly drive output devices like solenoids
Electrical Control Systems
What does Logic Devices Do?
They are are the Decision making devices of electric control systems
Electrical Control Systems
What does Machine Logic design Do?
tells the decision making portion of the machine to turn on or turn off outputs connected to the logic system
Electrical Control Systems
How many Inputs does a Machine Logic need?
The logic may need 1 or more inputs to be on or off before turning on a given output, or 1 input on and 1 off.
Relays
What does a Relay do
made to make or break an electrical circuit.
The discrete output on a relay is what?
A switch has a discreet output that is either on or off
The purpose of a Safety Shutdown Switches is what?
devices that prevent out of range or dangerous operating conditions and are part of a process control
Pressure Switches measure what?
The pressure of fluids inclosed containers
*The Bellows-operated pressure switch and Diaphragm-operated pressure switch are methods of measuring pressure.
*Hydraulic and Pneumatic pressure switches are usually open or closed contacts and are designed to send an output voltage signal to the device they are controlling.
*The Bellows-operated pressure switch and Diaphragm-operated pressure switch are methods of measuring What
pressure.
What is the purpose of Temperature Switches
Control temperatures and shut down processes in case of excessively high temperatures.
Temprature Switches contain what element to provide the actuation for the switch.
a bimetallic element
Emergency Stop Switches are used when?
Rapid shutdown of equipment for safety or process reasons
What Pushbutton is the same as the Emergency Stop Switches
Master Control Pushbuttons
since they can shut down a complete equipment line with one action
Purpose of Interlock Switches
used to cause an action or to prevent an action that would be detrimental to the equipment involved
