Device fusing

The device fusing can be selected according to various methods:

Conservative

Select the fusing in accordance with the maximum device fusing of the corresponding power supply module.

Power supply modules

Fuse

AX8620-0000

Maximum 25 A

AX8640-0000

Maximum 50 A

AX8525-0000

Maximum 100 A

AX8540-0000

Maximum 100 A

Application-oriented

Add together the motor currents of all connected servomotors. Multiply the sum by the application-typical simultaneity factor. In the case of a machine tool this is relatively high, e.g. 0.9, because all axes can drive into the material at the same time. In the case of a handling system the factor is more likely to be 0.7.

Device fusing 1:

Example: handling system with three axes:

In the following example, a typical use case with a three-axis handling system is described.

The use case is only an example and does not offer the basis for a planned application.

 

X

Y

Z

Servomotor

AM8042-0JH0

AM8031-0DH0

AM8021-0BH1

Current

6.90 A

1.95 A

0.85 A

Total sum current:

9.70 A x simultaneity factor 0.7 = 6.8 A

Selected power supply module:

AX8620-0000

Selected fuse protection:

10 A

Device fusing 2:

Example of the design of the current-limiting fuses in the system group

Device fusing 3:

Nominal output current of the axis modules is 18 A for AX8118-0000 and 8 A for AX8108-0000 = 26 A

Total nominal output current = 26 A

The system group must be fused with at least 26 A.
Select the next higher standard level for this according to UL 508A, Tab. SB4.2. This corresponds to class "J" with 40 A.