Thompson Pretorquing - O. Thompson Microflite Ultra 2000 Installation & Adjustment Manual

D6 - When on, indicates the bottom terminal slowdown contact has been broken.
D9 - When on, indicates the top terminal slowdown contact is closed.
D10 - When on, indicates the bottom terminal slowdown contact is closed.
Pressing and holding switch two (S2) causes the state of the six encoder sensors to be displayed on
LED's D1-D6. If the car is moved at a slow inspection speed it is possible to see these LED's
sequentially blink on and off. If the LED associated with a sensor does not blink when the car is
moved, it means that the sensor associated with it is bad and the sensor board must be replaced.
13.1.5 Digital Speed Profile
The MicroFlite Ultra 2000 develops an ideal pattern that is continuously corrected throughout the
duration of the run. The curve is corrected based on the encoder feedback received and plotted over
time to give the microprocessor a speed feedback of its own. The car stops based solely on the
encoder position, and does not need to transfer to an approach or leveling curve based on a leveling
magnet as with most other systems.
The speed curve profile, door time, and many other things are programmed on a per car basis, and
are adjusted at the car controller. Each car is also equipped with its own monitor for troubleshooting.
13.1.6 O. Thompson Pretorqueing
Pretorquing is an optional feature supplied normally on gearless elevators. It is used to improve ride
quality and floor to floor performance times. This is done by accurately measuring the load in the car
through the use of a strain gauge mounted to the cross head. As the doors close for a run, the weight
value is locked and sent to the main processor to develop a pre-torque signal to prevent the car from
moving when the brake is released. The motor drive system is enabled prior to the brake being
energized. When the motor drive system is enabled, a pre-toque signal is sent to the motor drive
processor to provide a specific amount of motor current prior to the brake lifting. When the brake lifts,
the motor will have sufficient torque to hold zero speed prior to acceleration. This results in a smooth
acceleration and will actually improve floor to floor performance due to the improved tracking
characteristics of the motor drive system.
Revision: AA 2.2
Microflite Ultra 2000
with "Curve Correction"
Printed 03 - 15 - 03 13 - 9