F-Stop / FÂ Forced Stop (Logic Input) fault in Toshiba drive
F-Stop / F Forced Stop (Logic Input) fault in Toshiba drive
Description "F-Stop" (or sometimes displayed simply as "FL") is not a hardware fault. It indicates that a specific digital input terminal configured as "Forced Stop" has been activated. This is a logic trip. It is distinct from Emergency Stop (E) because F-Stop is often used for process interlocks (e.g., "Tank Full" or "Conveyor Jammed") rather than human safety. Causes
1. External Sensor: A sensor wired to a digital input (like S3 or S4) triggered the stop.
2. Logic Configuration: The input is set to "Normally Open" (NO) but the sensor is "Normally Closed" (NC), causing the drive to think the stop command is always active.
3. Automation System: The PLC sent a "Force Stop" bit over the communication link. Solution Check the Input Terminal Status monitor. Navigate to the monitor menu where you can see the ON/OFF status of F, R, RES, S1, S2, S3.
Look for the terminal that is ON. Consult your parameter list (F110 to F118) to see which terminal is assigned function "Forced Stop." If Terminal S3 is assigned Force Stop and S3 is currently ON (receiving 24V), you have found the culprit. Trace the wire from S3 back to the field sensor or switch.
If the terminal is OFF but the drive still says F-Stop, check the logic settings (NO vs NC). If the parameter is set to "Active Low," an open wire will trigger the stop.
Description "F-Stop" (or sometimes displayed simply as "FL") is not a hardware fault. It indicates that a specific digital input terminal configured as "Forced Stop" has been activated. This is a logic trip. It is distinct from Emergency Stop (E) because F-Stop is often used for process interlocks (e.g., "Tank Full" or "Conveyor Jammed") rather than human safety. Causes
1. External Sensor: A sensor wired to a digital input (like S3 or S4) triggered the stop.
2. Logic Configuration: The input is set to "Normally Open" (NO) but the sensor is "Normally Closed" (NC), causing the drive to think the stop command is always active.
3. Automation System: The PLC sent a "Force Stop" bit over the communication link. Solution Check the Input Terminal Status monitor. Navigate to the monitor menu where you can see the ON/OFF status of F, R, RES, S1, S2, S3.
Look for the terminal that is ON. Consult your parameter list (F110 to F118) to see which terminal is assigned function "Forced Stop." If Terminal S3 is assigned Force Stop and S3 is currently ON (receiving 24V), you have found the culprit. Trace the wire from S3 back to the field sensor or switch.
If the terminal is OFF but the drive still says F-Stop, check the logic settings (NO vs NC). If the parameter is set to "Active Low," an open wire will trigger the stop.
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