ControlPanelDevices copy

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Hennepin Technical College *

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1155

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Mechanical Engineering

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Dec 6, 2023

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pdf

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CONTROL PANEL DEVICES BASIC CONTROLS 1-15 P Procedure Summary In the first part of this exercise, you will use one NO and one NC push button contact to power two pilot lights. This procedure will demonstrate that push button contacts are momentary. Once again, it is necessary to use the Control Transformer in order to obtain a voltage compatible with the Pilot Lights module. In the second part of the exercise, you will use a similar circuit, in which a toggle switch is employed instead of the push buttons. You will observe that the toggle switch differs from the push buttons in that it has a maintained contact. In the third part of the exercise, you will verify, with the help of an ohmmeter, that the behavior of the selector switch corresponds to the indications provided on its module faceplate. EQUIPMENT REQUIRED Refer to the Equipment Utilization Chart in Appendix A to obtain the list of equipment required for this exercise. Industrial Controls Training System V21113 Save As

CONTROL PANEL DEVICES 1-16 BASIC CONTROLS PROCEDURE The AC Power Supply provides high voltages. Do not change any AC connection with the power on. Basic setup 1. Perform the Basic Setup and Lockout/Tagout procedures. Momentary contacts 2. Connect the circuit shown in Figure 1-7. Figure 1-7. Basic push button circuit. Industrial Controls Training System V21113 ✔ ✔

CONTROL PANEL DEVICES BASIC CONTROLS 1-17 3. Perform the Energizing procedure. 4. After the Lockout Module is turned on, which pilot light(s) illuminate(s) when: C no push button is pressed? L1 pilot light L2 pilot light Both None C only the START push button is pressed? L1 pilot light L2 pilot light Both None C only the STOP push button is pressed? L1 pilot light L2 pilot light Both None C both push buttons are pressed? L1 pilot light L2 pilot light Both None 5. Following your last observations, what type of contacts are connected to: C push button terminals 1-2? Normally open Normally closed C push button terminals 3-4? Normally open Normally closed 6. Does the state of a pilot light associated with a push button change when the button is released? Yes No 7. How can we characterize the Push Buttons module contacts? Maintained Momentary Industrial Controls Training System V21113 ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

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CONTROL PANEL DEVICES 1-18 BASIC CONTROLS Maintained contacts 8. Perform the Lockout/Tagout procedure. Connect the circuit shown in Figure 1-8. Figure 1-8. Basic toggle switch circuit. 9. Set the TS toggle switch of the Selector Switches module to the O position. 10. Perform the Energizing procedure. After the Lockout Module is turned on, does a pilot light illuminate? Explain why. Industrial Controls Training System V21113 ✔ ✔ ✔ If the toggle switch is in comm position, no light wont turn but if either left/ right position then one of the lights turn on.

CONTROL PANEL DEVICES BASIC CONTROLS 1-19 11. Set the TS toggle switch to the L position. Which light illuminates? L1 pilot light L2 pilot light Both None 12. Set the TS toggle switch to the R position. Which light illuminates? L1 pilot light L2 pilot light Both None 13. Does the toggle switch contact return to its original state after you release it? Yes No 14. How can we characterize the toggle switch contacts? Maintained Momentary 15. Turn off the Lockout Module. 16. Using an ohmmeter, determine which contacts of the Selector Switches module are closed when the selector is set to a specific position. Fill out Table 1-1 by putting an "X" mark when a contact is closed. Note: You will learn later in this manual that this type of table, showing the different contact states of a device, is called a target table. CONTACT SELECTOR POSITION L O R SS-1 SS-2 SS-3 SS-4 Table 1-1. Target table of the Selector Switches module. Industrial Controls Training System V21113 ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ x o o o o x x o o o o x

CONTROL PANEL DEVICES 1-20 BASIC CONTROLS 17. Does your table correspond to the one located on the module faceplate? Yes No 18. Turn the individual power switch of the AC Power Supply off, disconnect the circuit, remove the magnetic labels, and return the equipment to the storage location. Industrial Controls Training System V21113 Name Date Instructor's Approval ✔ ✔ ✔ Save As Submit Print

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