Question

3. For the circuit shown in Figure START switch is pressed, the when the motor starter contactor energizes as usual. However, when the START switch is released, the contactor de-energizes and the motor stops. What is the most likely cause of this problem? T1, T2, and l3. L3 AC L2 pical Motor LINE L1 FIGURE 11-2 Starter Application H1 H3H2 H4 FUSE X2 X1 OLİOLİOL EMERGENCY STOP START STOP OL 95 96 13 14 MOTOR In operation, when the rails are powered, press power to the motor starter coil M Arl ing the START switch provides

Answer 1

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If the "START" switch is energized, the current loop for the secondary of the transformer X1-X2 becomes complete and the motor starts to run. However, it is given that when the "START" switch is released, the contactor de-energizes. The reason may be because the contactor capacitor in parallel with the "START" switch may be of a low value, resulting in a high impedance path for the AC current. This reduces the current through the mains connected to the motor, resulting in th contactor de-energizing.

Note that the above may be one of the reasons, there may be other reasons as well.
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