As shown in the illustration, under what...

🔍 Key Concepts

• Trace the control circuit from the red indicator (RB) back to the power source to see what must be closed for current to reach the lamp. • Note which auxiliary contacts (1CR and M) are in series with the red lamp, and under what operating condition each of those contacts is closed. • Compare the behavior of the overload contact (OL) and the interlock switches with the state of the red lamp – do they provide power to it or remove power from it?

💭 Think About

• When the motor is running normally, which contacts in the lower ladder diagram are energized and closed, especially those labeled 1CR and M? • If the motor trips on overload and the OL contact changes state, what happens to the 1CR coil and, in turn, to the contact feeding the red lamp? • Do the interlocks in the circuit supply power to the red lamp, or do they interrupt power and prevent either the coil or the motor from being energized?

✅ Before You Answer

• Verify exactly where the RB (red lamp) connects in the ladder: on which rung, and which contacts are in series with it. • Confirm whether the OL contact is in the same current path as the red lamp, and whether it would be open or closed during an overload trip. • Determine whether the M auxiliary contact is only closed when the motor contactor is pulled in and the motor is actually connected across the line.

As shown in the illustration, under what conditions would the red indicator light be illuminated? See illustration EL-0136.

specifically when a safety interlock device prevents motor operation

any time the motor is connected across line

any time the motor has been stopped for any reason

specifically when the motor has tripped out on overload

🔍 Key Concepts

💭 Think About

✅ Before You Answer