Common interlock safety applications include detecting guards in place. Which of the following is another common interlock signal?

Common interlock safety applications include detecting guards in place. Which of the following is another common interlock signal?

• A. Guards in place
• B. Oil pressure is at a safe range
• C. Air pressure is at a safe level
• D. Oil temperature is at a safe level

Answer: (B)

Interlocks ensure the machine operates only under safe conditions. Detecting guards in place is a classic example, because the machine must not run if a guard is open. A common second interlock signal is oil pressure within a safe range. Hydraulic systems rely on proper oil pressure to actuate components correctly and to stop reliably; if the pressure is too low or outside the safe range, the control system should prevent starting or stop the machine to avoid harm or damage. While other monitored factors like air pressure or oil temperature can indicate faults, oil pressure is a direct readiness signal for the hydraulic system and is widely used as an interlock.

Interlocks ensure the machine operates only under safe conditions. Detecting guards in place is a classic example, because the machine must not run if a guard is open. A common second interlock signal is oil pressure within a safe range. Hydraulic systems rely on proper oil pressure to actuate components correctly and to stop reliably; if the pressure is too low or outside the safe range, the control system should prevent starting or stop the machine to avoid harm or damage. While other monitored factors like air pressure or oil temperature can indicate faults, oil pressure is a direct readiness signal for the hydraulic system and is widely used as an interlock.