Which device prevents drive motor power if slack is detected?

• A. Slack Cable Safety Device
• B. Footrest Switches
• C. Swivel Seat Cut-off Switch
• D. Traveling Cable Tracking

Answer: (A)

The key idea is a safety mechanism that stops the drive when the drive cable or chain has too much slack. The Slack Cable Safety Device monitors tension in the drive system and, if slack is detected, it interrupts power to the drive motor (or triggers a brake) to stop the escalator or moving walk. This prevents the chain or belt from slipping, jumping teeth, or derailing that could happen if the motor kept forcing movement with loose cable.

Footrest Switches protect against rider presence on the footrest, not drive slack. Swivel Seat Cut-off Switch stops the unit if a seated rider leaves, and Traveling Cable Tracking focuses on keeping the cables aligned and protected rather than stopping drive power for slack.