BECKHOFF EP2xxx - Manual (Page 91)

Mounting and cabling
Fig. 84: Power cable conductor losses
Example
8 m power cable with 0.34 mm² cross­section has a voltage drop of 3.2 V at 4 A.
Note
EP92x4 Power Distribution Modules
With EP9214 and EP9224 Power Distribution Modules intelligent concepts for voltage sup­
ply are available. Further information may be found under www.beckhoff.com/EP9224.
3.4 UL Requirements
The installation of the EtherCAT Box Modules certified by UL has to meet the following requirements.
Supply voltage
CAUTION
CAUTION!
• by a 24 V
DC
supply voltage, supplied by an isolating source and protected by means of
a fuse (in accordance with UL248), rated maximum 4 Amp, or
• by a 24 V
DC
power source, that has to satisfy NEC class 2.
A NEC class 2 power supply shall not be connected in series or parallel with another
(class 2) power source!
CAUTION
CAUTION!
To meet the UL requirements, the EtherCAT Box Modules must not be connected to unlim­
ited power sources!
EP2xxx 91 Version 2.1.0