CHAPTER 10 PERIPHERAL EQUIPMENT

10.2.3 How to Calculate the Servo Amplifier Input Current

Calculate the servo amplifier input current in the following equation to select peripheral equipment.

Formula

Input current (single-phase 200 V): Iin = (Po + Pi) / (Vac × 1.35 × ηamp × ηmot) × 1.27 × √3

Input current (3-phase 200 V): Iin = (Po + Pi) / (Vac × 1.35 × ηamp × ηmot) × 1.27

ηamp (amplifier efficiency) = 0.95 and ηmot (motor efficiency) = 0.90 are common among all

models.

 Single-phase 200 V

Rated rotation

speed

[r/min]

Capacity

(Po)

[kW]

3000

2000

1500

* -10% of 200 V

0.05

0.1

0.2

0.4

0.75

0.5

0.75

0.5

Input voltage

(Vac)

[V]

180*

Internal power

consumption

(Pi)

[W]

15

Input current

(Iin)

[A]

0.7

1.3

2.4

4.7

8.6

5.8

8.6

5.8

Input current for

selection of peripheral

equipment

(Iin×1.5) [A]

1.1

2.0

3.6

7.1

13.0

8.7

13.0

8.7

10

Cable Size 10-7