L-Stop / LSÂ Limit Switch Stop fault in Toshiba drive
L-Stop / LS Limit Switch Stop fault in Toshiba drive
Description This is a position-based logic trip. It indicates the machine has hit a travel limit switch wired to the drive. This is common in traversing applications like cranes, hoists, or automated sliding doors. When the limit switch is hit, the drive prevents motion in that specific direction but usually allows motion in the opposite direction. Causes
1. End of Travel: The machine physically reached the end of the rail.
2. Broken Switch: The physical limit switch is damaged or stuck in the "pressed" position.
3. Cut Wire: The wire coming from the limit switch is cut, and the input is configured as "Normally Closed" (fail-safe). Solution This is rarely a drive fault and almost always a machine status.
To recover, you usually just need to run the motor in the *reverse* direction. The drive logic typically permits reverse operation even when the Forward Limit is active.
If the machine is in the middle of the track but trips L-Stop, check the wiring. Identify which terminal (e.g., S1 or S2) is assigned "Limit Switch Forward/Reverse." Check for 24V at that terminal. If the switch is broken, you may need to temporarily jumper the terminal to 24V (or Common) to move the machine for repairs.
Description This is a position-based logic trip. It indicates the machine has hit a travel limit switch wired to the drive. This is common in traversing applications like cranes, hoists, or automated sliding doors. When the limit switch is hit, the drive prevents motion in that specific direction but usually allows motion in the opposite direction. Causes
1. End of Travel: The machine physically reached the end of the rail.
2. Broken Switch: The physical limit switch is damaged or stuck in the "pressed" position.
3. Cut Wire: The wire coming from the limit switch is cut, and the input is configured as "Normally Closed" (fail-safe). Solution This is rarely a drive fault and almost always a machine status.
To recover, you usually just need to run the motor in the *reverse* direction. The drive logic typically permits reverse operation even when the Forward Limit is active.
If the machine is in the middle of the track but trips L-Stop, check the wiring. Identify which terminal (e.g., S1 or S2) is assigned "Limit Switch Forward/Reverse." Check for 24V at that terminal. If the switch is broken, you may need to temporarily jumper the terminal to 24V (or Common) to move the machine for repairs.
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