During manual operation of Ball Screw Drive Unit, what must be OFF?

• A. Hand wheel must be rotated slowly during operation.
• B. Power key switch should be OFF during manual operation.
• C. Emergency stop must be engaged.
• D. Battery must be removed during operation.

Answer: (B)

To perform manual operation safely, the drive must not be energized. Turning the power key switch OFF removes electrical power from the Ball Screw Drive Unit, so the motor cannot turn the screw even if you move the hand wheel or touch the controls. This prevents unexpected motion that could injure you or damage the equipment while you’re positioning or aligning parts.

The emergency stop is a safety device used to halt motion in an emergency; it isn’t the normal setting for manual operation. Keeping the system powered off is the standard way to ensure complete de-energization, and removing a battery isn’t part of the typical manual-operation procedure for this equipment.