Appendix B – Jerk Rate Calculator Program - Hitachi SJ300-EL Series Instruction Manual Supplement

Appendix B – Jerk Rate Calculator Program
Appendix B – Jerk Rate Calculator Program
The SJ300-EL inverter has a variety of parameters that allow for the control of the speed
and acceleration contours. However, some elevator system designers may specify a
particular jerk rate for their system. While jerk rates cannot be programmed directly into
the SJ300-EL, by appropriate settings of the available parameters, jerk rate can be
controlled fairly accurately. There is a definite mathematical relationship between the
various inverter parameters and the jerk rate that is obtained.
In order to eliminate the necessity of doing cumbersome manual calculations, Hitachi
has developed an automated Jerk Rate Calculator Program to do these calculations for
you. This program is available at the Hitachi America AC Inverter web site by going to:
www.hitachi.us/inverters, then navigate to the Software Downloads section in the right
column. You will find the calculator on that page.
The program will open in a window on your web browser, and will allow you to enter key
values, such as maximum frequency, linear speed at maximum frequency, desired jerk
rates, maximum desired acceleration, and preset speeds, etc. The program will then
calculate the required inverter parameters to achieve the specified performance.
A screen image of the calculator program appears on the next page.
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