UL notice
Basic principles
Two UL certificates are met in the Beckhoff EtherCAT product range, depending upon the components:
- 1.
- UL certification according to UL508. Devices with this kind of certification are marked by this sign:
- 2.
- UL certification according to UL508 with limited power consumption. The current consumed by the device is limited to a max. possible current consumption of 4 A. Devices with this kind of certification are marked by this sign:
Almost all current EtherCAT products (as at 2010/05) are UL certified without restrictions.
Application
If terminals certified with restrictions are used, then the current consumption at 24 VDC must be limited accordingly by means of supply
- ▪
- from an isolated source protected by a fuse of max. 4 A (according to UL248) or
- ▪
- from a voltage supply complying with NEC class 2.
A voltage source complying with NEC class 2 may not be connected in series or parallel with another NEC class 2compliant voltage supply!
These requirements apply to the supply of all EtherCAT bus couplers, power adaptor terminals, Bus Terminals and their power contacts.