Magnetek Elevator Quattro DC - Inertia Calculations

Appendix – Inertia Calculations
124
Appendix
Inertia Calculations
The Quattro DC software can be used to
calculate the inertia of the entire elevator,
which is used for accurate tuning of the speed
regulator.
The following is a step-by-step procedure for
using the Quattro DC to estimate the elevator
system inertia.
Using the Software to Estimate the
System’s Inertia
With a balanced car, run the car at 100%
contract speed from top floor to the bottom
floor then back to the top floor.
Note: To obtain the proper reading the drive
cannot be in field weakening. To disable the
field weakening mode go to the A6 submenu
and set the weak field amps to the same value
as the full field amps. After running the test set
the parameter back. Failure to disable the field
weakening may cause the results to be higher
than required and cause performance issues.
Observe the EST INERTIA under DISPLAY
MENU - ELEVATOR DATA D1 for both the
down and up direction.
Average the two values and enter the DRIVE
A1 parameter. Once this value is calculated
and set, it should not require further adjusting.
RUN/FAULT
SUB MENU
DATA ENT
EST INERTIA
D1 1.50 seconds
RUN/FAULT
SUB MENU
DATA ENT
INERTIA
A
1 01.50 sec