Ul Requirements; Fig. 24 Ul Label - Beckhoff EP3744-0041 Documentation

3.3

UL Requirements

The installation of the EtherCAT Box Modules certified by UL has to meet the following requirements.
Supply voltage
CAUTION!
This UL requirements are valid for all supply voltages of all marked EtherCAT Box Modules!
For the compliance of the UL requirements the EtherCAT Box Modules should only be supplied
• by a 24 V supply voltage, supplied by an isolating source and protected by means of a fuse (in accor-
DC
dance with UL248), rated maximum 4 Amp, or
• by a 24 V power source, that has to satisfy NEC class 2.
DC
A NEC class 2 power supply shall not be connected in series or parallel with another (class 2) power
source!
CAUTION!
To meet the UL requirements, the EtherCAT Box Modules must not be connected to unlimited power
sources!
Networks
CAUTION!
To meet the UL requirements, EtherCAT Box Modules must not be connected to telecommunication net-
works!
Ambient temperature range
CAUTION!
To meet the UL requirements, EtherCAT Box Modules has to be operated only at an ambient temperature
range of 0 to 55°C!
Marking for UL
All EtherCAT Box Modules certified by UL (Underwriters Laboratories) are marked with the following label.
Fig. 24: UL label
EP3744-0041 and EP3744-1041
CAUTION
CAUTION
CAUTION
CAUTION
Version: 2.2
Mounting and connection
29