Fuji Electric ALPHA5 Smart - How to Calculate the Servo Amplifier Input Current

CHAPTER 10 PERIPHERAL EQUIPMENT
Cable Size 10-7
10
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]
Input voltage
(Vac)
[V]
Internal power
consumption
(Pi)
[W]
Input current
(Iin)
[A]
Input current for
selection of peripheral
equipment
(Iin×1.5) [A]
0.05 0.7 1.1
0.1 1.3 2.0
0.2 2.4 3.6
0.4 4.7 7.1
3000
0.75 8.6 13.0
0.5 5.8 8.7
2000
0.75 8.6 13.0
1500 0.5
180* 15
5.8 8.7
* -10% of 200 V