Electrician Red Seal · Question
A safety light curtain is installed on a machine to protect personnel. The machine's control circuit is designed such that if the light curtain is interrupted, the machine must immediately stop and not restart until the light curtain is clear AND a manual reset button is pressed. What type of control logic is required for the reset function to meet this safety requirement?
A momentary maintained reset, often implemented with a single-pulse button, requires the operator to actively press and then release a button to reset the safet
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Question: A safety light curtain is installed on a machine to protect personnel. The machine's control circuit is designed such that if the light curtain is interrupted, the machine must immediately stop and not restart until the light curtain is clear AND a manual reset button is pressed. What type of control logic is required for the reset function to meet this safety requirement?
Answer options: ✅ Momentary maintained reset.
- Automatic reset.
- Interlock defeat.
- Continuous reset.
Correct answer: Momentary maintained reset.
Explanation: A momentary maintained reset, often implemented with a single-pulse button, requires the operator to actively press and then release a button to reset the safety circuit after the hazard has been cleared. This ensures a deliberate action by the operator, preventing an unexpected restart if the light curtain clears without someone noticing.
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