As shown in figures "A", "B", "C", and "D"...

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Question 1 of 205eccefa5bacbc34ba4d4887d

As shown in figures "A", "B", "C", and "D" of the illustrated PLC controlled heating system, what input requirements must be met for the circulating pump #2 to be running? See illustration EL-0260.

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Question 1 of 20

5eccefa5bacbc34ba4d4887d

As shown in figures "A", "B", "C", and "D" of the illustrated PLC controlled heating system, what input requirements must be met for the circulating pump #2 to be running? See illustration EL-0260.

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🔍 Key Concepts

• Study the ladder diagram (Figure C) and trace only the rung that controls circulating pump motor #2. • Compare which sensor is in series with pump #2: space air sensor vs. hot water tank sensor. • Notice the PLC output contact labeled Boiler on the pump #2 rung and relate its state to the boiler firing vs. idle condition.

💭 Think About

• On the ladder rung for circulating pump #2, which single temperature sensor contact must close to energize that motor coil? Is it the space air sensor or the tank water sensor? • Is the contact labeled "Boiler" on that rung drawn as a normally open contact that only closes when the boiler output is energized (i.e., boiler firing), or is it made when the boiler is idle? • Look at the timing diagram (Figure D): when circ. pump motor #2 turns on, what is happening to the boiler output at that same time interval?

✅ Before You Answer

• Verify exactly which sensor symbol is wired in series with Circ. pump motor #2 on Figure C (do not rely on the piping diagram alone). • Confirm whether the Boiler contact feeding pump #2 is shown as normally open and only closes when the boiler coil is energized (indicating boiler firing). • Match your interpretation with Figure D to ensure that when pump #2 is running, the Boiler trace is in the correct state (firing vs. idle) at the same time.

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Question 1 of 205eccefa5bacbc34ba4d4887d

As shown in figures "A", "B", "C", and "D" of the illustrated PLC controlled heating system, what input requirements must be met for the circulating pump #2 to be running? See illustration EL-0260.

Back

Question 1 of 20

5eccefa5bacbc34ba4d4887d

As shown in figures "A", "B", "C", and "D" of the illustrated PLC controlled heating system, what input requirements must be met for the circulating pump #2 to be running? See illustration EL-0260.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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