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Chapter 13

Chapter 13. Fluid Power System Electrical Control. Electrical Quantities • Basic Electrical Circuits • Electrical Control Circuits • Electrical Diagrams and Applications. Direct current flows in one direction only, while alternating current reverses its direction of flow at regular intervals.

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Chapter 13

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  1. Chapter 13 Fluid Power System Electrical Control Electrical Quantities • Basic Electrical Circuits • Electrical Control Circuits • Electrical Diagrams and Applications

  2. Direct current flows in one direction only, while alternating current reverses its direction of flow at regular intervals.

  3. The voltage needed to move electrons in an electrical circuit is comparable to the fluid pressure needed to cause hydraulic fluid to flow through a pipe in a hydraulic system.

  4. The higher the resistance, the lower the current, and the lower the resistance, the higher the current.

  5. Insulation commonly used in fluid power systems are plastic coverings over electrical wires, cables, and other conductors.

  6. Electrical devices used in fluid power systems are typically connected in parallel so that they can have the same amount of voltage.

  7. A series circuit has two or more components connected in a manner so that there is only one path for current to flow.

  8. A series-parallel circuit has at least one load connected in series with two or more loads connected in parallel.

  9. A holding circuit allows a load to remain on after the switch that controls it is released.

  10. An electrical control circuit is an electrical circuit that determines when the output component is energized or de-energized, while a power circuit accomplishes work in a fluid power system.

  11. All electrical circuits are comprised of an electrical power source, conductors, load, and a control switch or a relay.

  12. When using the AWG identification system, the larger the number, the smaller the diameter of the wire.

  13. When a switch is actuated, current flows through conductors and actuates a load (solenoid).

  14. There are many types of switches used for the electric control of fluid power systems.

  15. A general-purpose relay is a mechanical switch operated by a magnetic coil.

  16. The difference between a PLC programming diagram and a ladder diagram is that the inputs and outputs have the same symbol in a PLC programming diagram.

  17. The electrical control of a single-acting cylinder is usually accomplished with a two-position, four-way, spring-offset, solenoid-actuated directional control valve.

  18. The control of the single-acting cylinder in the industrial cardboard compactor can be improved by connecting an NC pressure switch in series with the pushbutton and solenoid.

  19. When the rod has fully extended, an NC limit switch has the same effect on the electrical control circuit as an emergency stop pushbutton.

  20. The electrical control of a double-acting pneumatic cylinder is commonly performed a two-position, four-way, five ported, spring-centered, NC, solenoid-actuated directional control valve.

  21. In an interlocking circuit, one branch can be energized at a time with a limit switch that has both NO and NC contacts.

  22. The electrical control of a double-acting cylinder can be used in a thermoforming press that requires a specific amount of force and heat to be applied to a plastic workpiece for a specific amount of time.

  23. In a metal shearing press, a holding circuit must be used to extend the rod and place the directional control valve spool into position.

  24. Electrical control circuits can sequence two cylinders without the use of a sequencing valve.

  25. Three double-acting cylinders connected in series can operate in sequence.

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