06 Week6 Lab 6-Jogging-Jog Relay Relay Logic-AND-OR josh0030 PDF

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LAB # 6: JOGGING - THE JOG RELAY & RELAY LOGIC - AND / OR

Name:

6.

NISARG P. JOSHI

Student Number

040882951

JOGGING - THE JOG RELAY & RELAY LOGIC - AND / OR

PRE-LAB 1. Complete questions 1 to 3. 2. Read the Circuit Specification and use it to prepare power and control drawings. 3. Draw a diagram of a lamp controlled by two switches. The lamp is energized if either of the switches is closed. Label this drawing “OR”. Place this on a drawing using the course template. 4. Draw a diagram of a lamp controlled by two switches. The lamp is only energized if both switches are closed. Label this drawing “AND”. Place this on the same drawing as 1. 5. Read the circuit description and use it to prepare two drawings. One drawing will show the connections for the lamps. This will be referred to as the power drawing. The other drawing will show the connections for the coils and switches. This is the control drawing. 6. Read “Wiring Relay Logic Circuits.”

EQUIPMENT 1.

Motor control work station

2.

Multi-meter

6a)

JOGGING - THE JOG RELAY

CIRCUIT SPECIFICATION 

Control the three phase motor with the magnetic motor starter.



Control the magnetic motor starter with a stop-start-jog station and jog relay.

PROCEDURE 1. Connect and test the circuit.

2. Test the jog button. Push the jog button and release it very quickly. Can you get it to act as a start button?

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LAB # 6: JOGGING - THE JOG RELAY & RELAY LOGIC - AND / OR

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LAB # 6: JOGGING - THE JOG RELAY & RELAY LOGIC - AND / OR 6b)

RELAY LOGIC - AND / OR

I.

WIRING RELAY LOGIC CIRCUITS

1) Begin by making sure your drawing is correct. 2) Use: a. One color for feeds (live wires) b. A different color for grounded conductors c. A third color for switched conductors 3) Avoid terminals having more than three wires. Figure shows wiring using a “home run” approach. Wire will tend to come apart at terminal F. This creates trouble shooting and safety issues. 4) Use “daisy chaining” as illustrated in Figure when more than three wires will connect together. 5) Test each part of the circuit as you build it. This is called modular testing.

CIRCUIT SPECIFICATION 

Relay coil A is controlled by a toggle switch. Relay coil B is controlled by a different toggle switch. Relay coil C is controlled by a third toggle switch.



A NO contact from relay coil D controls a lamp. A NO contact from relay coil E controls another lamp.



The D coil is energized if coils A, B and C are all energized.



The E coil is energized if coils A, or B or C are energized.

PROCEDURE 1. Complete the wiring of the two lamps through the relay contacts. Test this portion of the wiring by manually closing the D and E relays. 2. Wire the toggle switches to control relays A, B and C. Test the operation of each switch and coil. 3. Complete the wiring and check the circuit operations.

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LAB # 6: JOGGING - THE JOG RELAY & RELAY LOGIC - AND / OR

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LAB # 6: JOGGING - THE JOG RELAY & RELAY LOGIC - AND / OR Questions 1. Why is it impossible to get the jog button to act as a start button in part 2 of the Procedure?

A: As it has mentioned to release it quickly in part 2 of procedure so if when we release it, contacts will be open and it will give a short jab to the motor. Whilst if we want it to act as start button we have to keep the motor running continously. 2. Describe the sequence of operation of 6a circuit for the jogging. 1. Connect the circuit as shown in 6a with control relay and check all the connections

are according to the diagram shown. 2. Turn the power ON and check the circuit by pressing the start button and stopping

it with stop button. 3. After that by pressing the jog button at the intial position give a short jab to start

the motor. 4. After that give 2-3 jabs and check the jogging of the circuit. Hence, this way we

can give short jabs to the motor. 3.

Describe the sequence of operation of 6a circuit for the starting.

1. Connect the circuit as shown in 6a with control relay and check all the connections

are according to the diagram shown. 2. TURN the POWER ON.

3. After that press the start button check whether the motor is running or not.

4. Circuit should work properly and another start button (jog button) should also

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LAB # 6: JOGGING - THE JOG RELAY & RELAY LOGIC - AND / OR 4.

Based on the Circuit Specification, which coil, D or E is an example of an “AND”. Which coil, D or E is an example of an “OR”. AND coil D

5.

□

Coil E

□

OR coil D

Describe 2 advantages of modular testing.

1. We 2. In

.

□

Coil E

.

□

can save any major power device against damaging.

small circuit only, we can know whether there is any fault or not.

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