Researched and edited by Sifted Paws Editorial TeamResearch-based review; no hands-on testing is claimed unless specifically stated.
Quick answer
A gradual transition is safer for acceptance: place the new box beside the familiar box while powered off, introduce familiar litter scent, reward voluntary investigation, demonstrate manual cycles from a comfortable distance, and keep the conventional box until use is consistent.
Step 1: place it beside the current box
Keep the automatic machine unplugged and let the cat investigate without movement.
Step 2: make the scent familiar
Add a small amount of used litter to the clean bed. Do not make the new box dirty; the goal is recognition.
Step 3: reward voluntary use
Never place or trap the cat inside. Reward calm investigation and normal use.
Step 4: introduce a manual cycle at a distance
Run the machine only after the cat has left and can observe from a comfortable distance.
Step 5: enable automatic mode slowly
Use the longest suitable delay at first. Keep the conventional box until the cat uses the machine consistently.