Final Adjustments
3-14 Manual # 42-02-2M01 A1
Adjust Load Cell Compensation
If a load cell with an analog output is provided, it can be used to prevent rollback or movement
at the start of motion.
1. Referring to the job prints, verify that the analog output from the load cell is connected
to terminal 7 on the drive’s terminal block.
2. On the drive, verify that parameter F45 is Volt, F46 is 1.0, F47 is Off, F48 is E11,
F49 is 0.0%, F50 is -100.0%, and F51 is 100.0%. Note that the drive’s red reset button
must always be pressed after parameter F48 is modified.
3. On the drive, set parameter E10 to Off and E20 to 1.0.
4. On the controller, set F7 > Speed Pick Delay (134) parameter to 3 seconds while tak-
ing note of the original value.
5. Follow the load cell’s installation manual to configure and adjust the load cell.
6. Place a balanced load in the cab and observe drive parameter E11.
7. Set drive parameter E19 to the negative value observed at E11. For example, if E11 is
12.8%, then E19 would be set to -12.8%.
8. Observe that E13 is equal to 0.0%.
9. Activate the load cell by setting drive parameter E10 to On.
10. With an empty cab, initiate one-floor-run movement from the top terminal landing and
bottom terminal landing. Adjust drive parameter E20 to minimize any rollback or
movement at the start of motion from a terminal landing.
11. Restore controller’s F7 > Speed Pick Delay (134) parameter.
12. The load cell is now adjusted to provide motor pretorque at the start of elevator move-
ment.
Adjust Inertia Compensation
Inertia compensation can improve system performance and ride quality by providing optimum
control of the elevator. It reduces the dependence on the speed feedback from the motor by pre-
dicting what the system will do and providing the required torque command based on that pre-
diction. It will be able to reduce or eliminate speed overshoot into contract speed and leveling
speed. It will also allow a reduction in control gains to improve ride quality without adversely
affecting system performance.
1. On the drive, set parameter E14 to None and E15 to 0.05. After adjustment, E15 will
generally be between 0.05 and 0.1.
2. With an empty cab, run the car between terminal landings while monitoring drive
parameter U28. After the car stops and the motor contactor drops at both terminal
landings, take the average of the U28 values at the top and bottom terminal landings. To
calculate the average decimal value, divide that U28 average value by 10,000. Note:
There is a fixed decimal point between the fifth and sixth digit from the right, so a U28
average value of 7500 would be equal to 0.07500 average decimal value.
3. Set drive parameter E15 to the calculated U28 average decimal value. If the U28 value
observed is zero, the system was unable to determine a value; consequently, verify that
the car is traveling between terminal landings correctly. The car must spend an appre-
ciable amount of time accelerating to contract speed, running at contract speed, and
decelerating to leveling speed for the system to determine the appropriate value.
4. Enable inertia compensation by setting drive parameter E14 to Torque.
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