MCi iControl User Manual page 175

• Leveling Speed - If this speed is too high, a quick transition to zero speed will occur. This
results in a bump at the stop or possible overshoot at the floor resulting in a releveling
operation. If the leveling speed is too slow, the car will stop very close to the edge of the
dead zone, which will cause the system to relevel frequently. Reasonable values of Leveling
speed (Configuration > Pattern > Common tab) range from 3 to 6 fpm. Before setting the
Dead zone distance, the selection of Leveling speed must be completed so that you are sat-
isfied with the complete final approach to the floor. If overshoot occurs frequently, adjust
Dead zone distance.
• Dead zone - The purpose of the dead zone is to ensure that the elevator stops at the same
point whether approaching a particular floor from above or below. The dead zone is a soft-
ware-defined area at a floor, typically 0.25 inches (6 mm) to 0.75 inches (18 mm) in
height. Ideally, the elevator stops in the center of the dead zone.
Because of the mass of the elevator system, it will not stop as soon as it is commanded to
stop. It will slide slightly before stopping. The Dead zone distance should be adjusted so
that the elevator stops consistently at the same position relative to the floor level from
both directions. Dead zone adjustment need only be adjusted for one floor. All other floors
will react in the same way.
Note
Dead zone distance should be adjusted before fine tuning floor height offset.
1. Choose a floor in the middle of the hoistway so that the car can reach contract speed
when approaching the floor from either direction.
2. Start with the default Dead zone distance (Configuration > Pattern > General tab).
3. Put the car on Test operation. Verify that the iBox Inspection switch is in the NORM
position. Verify that the iBox Test switch is in the ON position.
4. Run the car to the chosen floor from the top and make sure the car achieves contract
speed. Note the position of the car when it stops at the floor (i.e., 1/4" above the floor or
1/8" below the floor, etc.).
5. Run the car to the chosen floor from the bottom and make sure the car achieves contract
speed. Note the position of the car when it stops at the floor.
6. If the car consistently stops at the same position, (for example, 1/8" above the floor
approaching from above or below), then Dead zone distance is properly adjusted. (Floor
Offset can be adjusted later so that the car stops perfectly level with the floor.)
7. If the car overshoots and relevels, the Dead zone distance is too tight. Increase Dead
zone distance and repeat steps 4 and 5.
8. Otherwise, the Dead zone distance is too wide. Decrease Dead zone distance until the
car stops consistently at the same position relative to the floor, repeating steps 4 and 5.
Adjusting Leveling and Final Stop
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