16 4.1 choose correct diagram a b c or d and short explanation why other options

Question

16 4.1

choose correct diagram

a b c or d

and short explanation why other options will not work

options

Section 16-4: Troubleshooting Contact-Based Timing Circuits Operate Delay Relays. A current monitor can be used to detect blade wear As the blade wears, the drive motor draws more current. When the current reaches a set limit, the current monitor activates the c The current monitor uses a current transformer to detect the amount of motor current. By using diferent cu rent transformers, currents from 0.1 A to 500 A can be detected 1. Draw a line diagram of the saw blade control circuit using a standard start/stop pushbutton station. Uie a magnetic motor starter to control the motor and a start/stop pushbutton station to control the motor starter Use the motor starter overload contact for overload protection. Do not include the current monitor in the line diagram. TO MOTOR STARTER MONITOA CURRENT TRANSFORMER I LATCHING

Explanation / Answer

# Option B is correct.

- Supply from L1 pass through stop (closed circuit N.C) and go to start first pin. Now when we press start button it become close contact(from initially open) , the supply start passing through start contact and goes to motor and pass through overload N.C (closed contact) and goes to L2 and the circuit works.

Now when we will leave the start pushbutton the supply through start will stop, that's why we have used motor(M) N.O contact . When after starting start motor start the N.O contact of motor also become N.C and now supply passes through this Motor contact used in parallel to start. Now if we leave start it will not make any difference as the supply is passing through this contact.

Now if we press stop, it's N.C will become N.O and circuit become open and supply disconnects.

# why others are incorrect?

In part A Stop is N.O which is open circuit so supply will not even start reaching the circuit.

In part C OL is N.O so supply will reach motor but not to L2. So circuit will be incomplete.

In part D motor contact used in parallel to start is N.C . Motor will start without even pressing start button and when motor start this N.C contact will become N.O and motor stops. this repeats again and again.

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