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Installation

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ASDA-A3

2

Assume that the load inertia is N times the motor inertia, when the motor decelerates from

3,000 rpm to 0, the regenerative energy is (N+1) × Eo and the regenerative resistor needs to

consume (N+1) × Eo - Ec joules. Assume that the reciprocating motion cycle is T sec, then the

required power of regenerative resistor = 2 × ((N+1) × Eo - Ec) / T. The calculation is as follows:

Step

1

2

3

4

5

6

7

Item

Set the capacity of the regenerative

resistor to the maximum.

Set the operation cycle (T).

Set the rotation speed (wr).

Set the load / motor inertia ratio (N).

Calculate the maximum regenerative

energy (Eo).

Find the regenerative energy that can be

absorbed by the capacitor (Ec).

Calculate the required capacity of the

regenerative resistor.

Calculation and setting method

Set P1.053 to the maximum value.

Manual input.

Manual input or read the status with P0.002.

Manual input or read the status with P0.002.

Eo = J x wr2/182

Refer to the preceding table.

2 × ((N+1) × Eo - Ec) / T

Example:

For the motor ECM-A3L-CY0604RS1 (400 W), the reciprocating motion cycle is T = 0.4 sec.

Its maximum rotation speed is 3000 rpm and the load inertia is 15 times of the motor inertia.

Servo drive

(kW)

Motor

0.4

ECM-A3L-CY0604RS1

Rotor inertia

J (× 10-4kg.m2)

0.15

Regenerative energy

generated when the motor

decelerates from 3000 rpm

to 0 without load Eo (joule)

Maximum

regenerative

energy of the

capacitance Ec

(joule)

0.74

8.42

Find the maximum regenerative energy: Eo = 0.74 joules (from the preceding table).

Find the regenerative energy that can be absorbed by the capacitor: Ec = 8.42 joules (from the

preceding table).

The required capacity of the regenerative resistor = 2 × ((N + 1) × E0 - Ec) = 2 × ((15 + 1) × 0.74 - 8.42) =

T

0.4

17.1 W

From the calculation above, the required power of the regenerative resistor is 17.1 W, which is

smaller than the specified capacity. In this case, the built-in 40 W regenerative resistor fulfills the

need. In general, the built-in regenerative resistor can meet the requirement when the external

load is not too great.

2-32

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