8.12 Positioning Parameters (LP)
These parameters are used to configure the position controller in the drive. To use this
function, the elevator control must be designed to give the proper signal sequence
ensuring correct operation.
Principle of operation:
• When LP01 Positioning Control = Posi One Floor and high speed is selected at the
beginning of the run, the drive enters positioning active (PA) mode and starts to
accelerate the car up to high speed. When the car passes the slowdown sensor in
the hoist way, the controller turns off the high-speed command to the drive. At this
moment, the drive recognizes that the car is at the learned LP03 High Speed
Slowdown Distance and then proceeds to create a slowdown profile to bring the car
to leveling speed.
• If the car is running at high speed, the drive simply calculates the deceleration
profile based on the adjusted values in LS23 Deceleration High Speed, LS24
Deceleration Jerk High Speed and LS25 Stop Jerk High Speed, and then
decelerates the car accordingly down to leveling speed. Once at leveling speed, the
elevator runs until floor level is reached and then the leveling speed and direction
are turned off causing the elevator to stop.
• If the car is still accelerating (<80% contract speed) when the slowdown is reached
(e.g., one floor run), the drive realizes this and calculates a profile to continue the
acceleration, up to the maximum high speed and then proceeds to decelerate the
elevator down to leveling speed.
• Similar to high speed operation, Intermediate Speed 1 can be used as a reduced,
short floor speed and will have a corresponding LP04 Short Floor Slowdown
Distance, and will follow the deceleration profile in LS33 Deceleration One Floor
NTS, LS34 Deceleration Jerk One Floor NTS and LS35 Stop Jerk One Floor NTS.