How to estimate the maximum input current of a servo drive?

Version 5.1 by Devin Chen on 2024/09/25 16:45

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)	recommended power cable diameter（mm²）
3	220	100	0.89	0.52	0.5
10		400	3.57	2.06	0.75
14		750	6.70	3.87	0.75
16		1800	16.07	9.28	1.00
21		2200	19.64	11.34	1.50
25		2600	23.21	13.40	2.50
30		3000	26.79	15.46	2.50
21	380	3000		8.14	1.00

Method 2: Use a formula for the calculation.

Given:
Output power: P_out

Input voltage: U_in

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: P_out=1000 W

Input voltage: U_in=220V

Efficiency: η=0.7

Power factor PF=0.8

Calculation:

✎Note: 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.

How to estimate the maximum input current of a servo drive?

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