Which condition relates to air as an interlock safety signal?

Which condition relates to air as an interlock safety signal?

• A. Oil temperature is at a safe level
• B. Air pressure is at a safe level
• C. Guards in place
• D. Temperature of the control panel

Answer: (B)

Interlocks ensure a machine runs only when guarding conditions are safe, and using air as the signaling mechanism means the system depends on air pressure to verify that the guard is in place. When the air pressure is at a safe level, the pneumatic interlock stays engaged and the machine is permitted to run. If the air pressure drops, leaks occur, or the supply is interrupted, the interlock releases and the machine stops to protect the operator. The other factors listed aren’t tied to the interlock signal: oil temperature is a process condition, guarding alone is a physical safety feature, and control panel temperature isn’t used as the air-based interlock signal. So, air pressure being at a safe level is the condition that relates to air as the interlock safety signal.

Interlocks ensure a machine runs only when guarding conditions are safe, and using air as the signaling mechanism means the system depends on air pressure to verify that the guard is in place. When the air pressure is at a safe level, the pneumatic interlock stays engaged and the machine is permitted to run. If the air pressure drops, leaks occur, or the supply is interrupted, the interlock releases and the machine stops to protect the operator. The other factors listed aren’t tied to the interlock signal: oil temperature is a process condition, guarding alone is a physical safety feature, and control panel temperature isn’t used as the air-based interlock signal. So, air pressure being at a safe level is the condition that relates to air as the interlock safety signal.