EC (Count Control ) Ch 11

Question 1

How does the electromechanical reset counter differ from the electromechanical reset timer?

Answer 1

The electromechanical reset counter counts discrete pulses and resets based on a mechanical or electrical reset signal. The electromechanical reset timer measures elapsed time and resets similarly, but is triggered by duration rather than events.

Question 2

What is the contact condition when the clutch is deenergized in an electromechanical counter?

Answer 2

The contacts remain in the default (deenergized) state, typically open or as-wired, waiting for the clutch to engage.

Question 3

What accuracy can you expect from a solid-state counter?

Answer 3

Up to 100% accuracy, especially with high-frequency, digital input pulses.

Question 4

What accuracy can be expected in modern solid-state counters?

Answer 4

100%

Question 5

What features are available in solid-state timer-counters?

Answer 5

• High accuracy and speed
• Preset counts/times
• Programmable outputs
• Non-volatile memory
• Multifunction timing modes (delay-on, interval, cycle)
• LED or digital displays

Question 6

What occurs if counter contact 1C-1 has a sequence of xOx (closed-open-closed)?

Answer 6

The device or load controlled by the contact would energize, then briefly deenergize, then re-energize—causing a momentary interruption in operation.

Question 7

What is the function of the NC relay contact 2CR-3?

Answer 7

It likely serves as a safety interlock or control bypass to stop the circuit or prevent retriggering under certain conditions.

Question 8

Under what condition does the stepping motor advance one step?

Answer 8

Each time the motor is energized.

Question 9

When does the counter output action occur in a solid-state counter?

Answer 9

When the preset count value is reached—the output is triggered (often closing or opening a contact).

Question 10

What are the three output status conditions and their notation?

Answer 10

• O (Open): Output contact is open
• X (Closed): Output contact is closed
• xOx (Sequence): Temporarily open in between two closed states—can represent a pulse or glitch

Question 11

A counter contact is open (deenergized), closed (counting), and closed (counted-out): Show contact and symbol.

Answer 11

• Deenergized (Open): ──o o──
• Counting (Closed): ──●──
• Counted-out (Closed): ──●──