How To Calculate The Servo Amplifier Input Current - Fuji Electric Alpha7 VV User Manual

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.
 In case of single-phase 200V
Servo
amplifier
capacity
(Po)
[W]
50
100
200
400
750
*-5% of 200V
 In case of 3-phase 200V
Servo
amplifier
capacity
(Po)
[W]
50
100
10
200
400
750
1000
1500
*-15% of 200V
10-6
Cable Size
Internal power
Input voltage
consumption
(Vac)
(Pi)
[V]
[W]
*
190 15
Internal power
Input voltage
consumption
(Vac)
(Pi)
[V]
[W]
*
170 15
Input current for
Input current
selection of peripheral
(Iin)
equipment
[A]
(Iin×1.5) [A]
0.7 1.0
1.2 1.7
2.2 3.2
4.2 6.2
7.7 11.5
Input current for
Input current
selection of peripheral
(Iin)
equipment
[A]
(Iin×1.5) [A]
0.4 0.6
0.7 1.1
1.4 2.1
2.7 4.0
5.0 7.4
6.6 9.8
9.8 14.7