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ASDA-A3

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Tuning

5.2 Inertia (Weight) estimation

Whether the load inertia ratio or total weight (P1.037) is correctly set affects the speed loop

bandwidth of the servo drive. If set incorrectly, the system’s performance cannot be optimized

after tuning.

When you use the functions of One Touch Tuning, Auto Tuning, or Gain adjustment mode 1

(Level adjustment - Auto) with ASDA-Soft, the servo drive automatically estimates the load

inertia or weight during the tuning process. If not using the preceding functions, you can directly

use the Inertia (Weight) Estimation function.

The estimation of load inertia or weight can be done without the controller’s command. During

the estimation process, the motor runs back-and-forth in the forward and reverse directions.

If the estimation cannot be done or the inertia (weight) cannot be correctly estimated in the

system, perform the estimation by yourself and set P1.037 with the estimated value.

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5.2.1 Precautions for inertia (weight) estimation

5.2.1.1 Rotary motor

Recommended settings for inertia estimation

1. Jog speed: 500 rpm or above.

2. Acceleration time from 0 rpm to 3,000 rpm or deceleration time from 3,000 rpm to 0 rpm:

within 200 ms.

3. Traveling distance: 1 revolution or above.

Description: if the estimated load inertia cannot be reduced to a stable value, increase the jog

speed first. If the traveling distance is too long, the estimation time is longer, too.

Inertia estimation cannot be done in the following systems

1. The mechanical part only moves in a single direction.

2. The movement speed of the mechanical part is lower than 200 rpm.

3. The effective stroke of the mechanical part is shorter than the traveling distance when the

motor rotates 0.5 revolution.

Inertia cannot be correctly estimated in the following systems

1. The load inertia ratio of the mechanical part changes drastically.

2. The load inertia ratio of the mechanical part is greater than 50 times.

3. The bandwidth of the mechanical part is lower than 10 Hz.

4. The viscous friction of the mechanical part is high.

5. The torque limit of the mechanical part is too low.

5-5

Send Quote Requests to info@automatedpt.com

Call +1(800)985-6929 To Order or Order Online At Deltaacdrives.com