Commissioning
5.2 Installation
PROFIBUS Optical Bus Terminal (OBT)
Operating Instructions, 04/2016, C79000-G8976-C122-07
23
Connecting the operating power supply
Image 5-3
Pin assignment of the 3-pin terminal block – grounding terminal
↓
and power supply M,
L+
1.
Supply the PROFIBUS OBT only with a stabilized safety extra-low voltage complying with
IEC 950 / EN 60 950/VDE 0805 of nominally 24 V (minimum 19.2 V and maximum 28.8
V). The power source must meet the requirements of NEC Class 2 according to the
UL/CSA approval.
2.
If the PROFIBUS OBT is not mounted on a grounded DIN rail, run a grounding cable with
a cross-section of 2.5 mm
2
from the terminal to the nearest ground keeping the cable
as short as possible.
