🕒 3 min read • 🟢 Beginner • Educational Resource
The Standard
ANSI B11 machine safety standards recognize that, after a safety device has been actuated or a safeguarding function has stopped hazardous motion, a manual reset may be required before the machine can resume operation.
The purpose of a manual reset is to confirm that the safeguarding device has been restored to its safe condition and that a person intentionally acknowledges the stop event before the machine is allowed to restart.
A reset function restores the safety circuit to a ready state—it does not initiate hazardous motion or automatically start the machine.
Note: Manual reset requirements vary depending on the safeguarding method, control system, machine type, and applicable ANSI B11 standard. Always consult the standards governing your equipment.
The Practical Translation
Think of the reset button as a confirmation, not a start button.
If an operator opens an interlocked guard door, interrupts a light curtain, or activates another safeguarding device, simply restoring the safeguard should not automatically restart the machine.
A manual reset requires someone to intentionally acknowledge that the safeguarding device has returned to its normal condition before another start command can be accepted.
The reset button should be located where the operator can reasonably verify that the hazard area is clear before resetting the safety function.
Ask yourself:
Does restoring the safety device automatically restart the machine?
Does the reset button only reset the safety circuit without causing hazardous motion?
Can the operator reasonably verify the hazard area is clear before pressing reset?
Is the reset device located outside the hazard zone?
Does every safety stop require an intentional restart command after the reset?
The Takeaway
A manual reset helps ensure that safeguarding has been restored and intentionally acknowledged before machine operation can continue.
Resetting a safety circuit should prepare the machine for operation—it should never cause the machine to automatically restart.
Compliance establishes when a manual reset may be required. Practical risk reduction asks whether someone can safely verify the hazard area before resetting the machine and intentionally starting production again.
Want to learn more?
Explore our guide on Manual Reset Requirements for Machine Safeguarding to learn where reset devices should be located, common application mistakes, and practical design considerations for machine safety systems.
