🔍 Key Concepts

• Trace the control circuit path in Figure A from point 1 to point 5 with the Start button held in. • Identify which devices in that path are normally closed (NC) and which are normally open (NO), and think about which one is most likely to interrupt the circuit when the motor is overloaded. • Remember that proper troubleshooting usually checks protective devices before assuming a component has failed.

💭 Think About

• If you already see full line voltage available between points 1 and 5 with the Start button depressed, what does that tell you about the disconnect switch (DS) and the supply lines? • Which single component in series with the contactor coil "M" would open automatically if the motor had drawn too much current, and how would that affect whether the contactor coil can energize? • Before testing or replacing the coil, what quick check could restore the circuit if a protective device had operated as designed?

✅ Before You Answer

• Confirm on the diagram that point 1 is tied to L1 (through DS) and point 5 is tied back to the other side of the supply for the control circuit. • List, in order, the series devices between 1 and 5: Stop, Start, M coil, and OL contact – note which are NC/NO. • Ask: which of these series devices is specifically designed to open on overload and can often be manually reset before further testing?