How to estimate the maximum input current of a servo drive?
Version 3.1 by Devin Chen on 2024/08/24 19:16
Method 1: Refer to the comparison in the table below.
| Output Current (A) | Output Voltage (V) | Output Power (W) | Input current (single phase) (A) | Input current (three phase) (A) |
|---|---|---|---|---|
| 3 | 220 | 100 | 0.89 | 0.52 |
| 10 | 400 | 3.57 | 2.06 | |
| 14 | 750 | 6.70 | 3.87 | |
| 16 | 1800 | 16.07 | 9.28 | |
| 21 | 2200 | 19.64 | 11.34 | |
| 25 | 2600 | 23.21 | 13.40 | |
| 30 | 3000 | 26.79 | 15.46 | |
| 21 | 380 | 3000 | 8.14 |
Method 2: Use a formula for the calculation.
Given:
Output power: Pout
Input voltage: Uin
Efficiency: η=0.7
Power factor PF=0.8
Formula:
For example:
The VD2-014SA1G driver is used in conjunction with the WD80M-10030S-A1G motor.
Output power: Pout =1000 W
Input voltage: Uin =220V
Efficiency: η=0.7
Power factor PF=0.8
Calculation:
If you need the maximum current value for the servo drive to select a circuit breaker, multiply the obtained current value by 1.5 to prevent the circuit breaker from tripping mistakenly.