Beckhoff AX8000 Series Manual page 12

Guidelines and Standards
2.3.1.1 UL configuration example of a system group
System group with UL approval:
The following figure describes a possible configuration example, a system group consisting
of several AX8000 devices with UL approval. Please note that prior to implementation on
your machine or system, it is essential to consult your responsible UL certification authority,
to discuss all further and required boundary conditions. Furthermore, when using fuse hold-
ers, it is important to ensure that they comply with the current directives and standards of
the UL certification body and that they have been tested accordingly.
To configure the current-limiting circuit breakers for your system group, proceed as
follows:
Determine the total rated output currents of all AX8000 modules in the system group.
In our example, we use an AX8640-0000 power supply module, an AX8810-0000 capacitor module, an
AX8118-0000 axis module and an AX8108-0000 axis module.
Calculation:
Rated output current of the AX8118-0000 (18 A) and AX8108-0000 (8 A) axis modules = 26 A.
Total rated output current = 26 A x correction factor 1.1 = 28.6 A.
According to the calculation, the system group would have to be fuse-protected with 28.6 A.
Please select the next larger default rating according to UL508A, Table SB4.2 for the sizing of your fuse
protection.
Selection of current-limiting circuit breakers according to UL508A, Table SB4.2:
In our configuration example, we select a UL circuit breaker according to UL508A, Table SB4.2 of type "G"
with 40 A, based on the total rated output current.
12 Version: 1.6 Multi axis servo system AX8000