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Safety Relay: Difference Between Auto Reset and Manual Reset

FAQ No. FAQ02358

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Question

What is the difference between an auto reset and manual reset?

Answer

An auto reset is when there is no reset switch in the feedback circuit and the device automatically starts when an input turns ON.

A manual reset is when there is a reset switch in the feedback circuit and the device does not start when the input turns ON unless the reset switch is pressed.

A manual reset is used for machines that people can enter and for emergency stop circuits, and an auto reset is used for machines that people cannot enter. Resets must occur only after all hazards have been cleared and a manual reset is basically safer. Auto resets can be used for guards through which people cannot enter. Always use manual resets for guards through which people can enter and emergency stops.

Caution!

G9S-2001/2002 Safety Relay Units

G9SB-2002-A Safety Relay Units

G9SB-200-B Safety Relay Units

G9SB-3012-A Safety Relay Units

G9SB-301-B Safety Relay Units

A manual reset cannot be used for the above models. Never use a manual reset with these models because sometimes danger cannot be avoided if a manual reset is used.

The same applies to using a manual reset for G9SA Safety Relay Units in Auto Reset Mode: Never use manual mode.