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F3SG-R
User’s Manual
Chapter2 Interlock
System Operation and Functions
E
2-9. Interlock
Install the reset switch in a location that provides a clear view of the entire hazardous zone and
where it cannot be activated from within the hazardous zone.
Install the pre-reset switch always in the hazardous zone and where it cannot be activated from
outside the hazardous zone.
2-9-1. Over view
The F3SG-RA turns the safety outputs OFF when its power is turned on or the F3SG-RA is blocked
and holds this state until a reset signal is received. This state is called "interlock state". The function to
keep the Interlock state is called "Interlock function".
The F3SG-RA has two Interlock functions, Start Interlock and Restart Interlock.
The F3SG-RE does not have the Interlock state and is only available with Auto Reset mode.
• Start Interlock
The F3SG-RA turns the safety output OFF at power-on or recovery from power failure and keep this
state until a reset signal is received. This is useful if you want to keep the machine stopped until a
pre-operation check is completed after the power is turned ON.
• Restart Interlock
The F3SG-RA turns the safety output OFF when the F3SG-R is blocked and keep this state until a
reset signal is received. Restart interlock is useful if you want to restart the machine being stopped
upon interruption of the F3SG-R, only after the operator confirms a safe condition.
The F3SG-RA offers three ways to reset the Interlock state: Auto Reset, Manual Reset, and Pre-Reset
applicable to specific applications.
• Auto Reset mode
Auto Reset mode disables the Start Interlock and Restart Interlock. When the interrupting object is
removed from the detection zone, the Interlock state is automatically released and the safety outputs
are automatically turned ON. Auto Reset is desirable for application where a worker is not able to
enter the area between the detection zone and the hazardous part of the machine or you use a relay
unit to activate Start Interlock and Restart Interlock.
• Manual Reset mode
Manual Reset mode enables the Start Interlock and Restart Interlock. When a reset signal is given
while no interrupting object exists in a detection zone, the safety outputs are turned ON.
• Pre-Reset mode
An operator may enter and work in the hazardous zone for maintenance.
Under such a circumstance, another operator may press the resest switch to restart the machine
without recognizing the operator working in the hazardous zone, posing a danger. The Pre-Reset
F3SG-RA Series X
F3SG-RE Series
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