Bus Wiring Of Several Load Cells; Power Supply - HBM C16i Montageanleitung

5.1

Bus wiring of several load cells

The bus wiring of several load cells come into being by joining together the
connection cables' core ends with identical colors. HBM recommend the use of
a junction box without dropping resistors (e.g. VKD2R-8).
TA (TX-)
TB (TX+)
RA (RX-)
RB (RX+)
UB
GND
PC
Fig. 5.1 Wiring code
5.2

Power supply

The load cell features a digital output with RS-485 (4-wire) interface. For the
power supply a DC supply voltage is required.
Power supply unit selection for C16i...
Procedure for selecting a suitable power supply unit to supply power to the in­
terface converter and the connected C16i... load cells:
1. Determine the required cable length between power supply unit and junction
box by examining the actual on site situation.
2. In the table below, read off actual power consumption values in relation to
the number of load cells used.
3. Select cable cross-section in the relevant line such that the required cable
length can be implemented. With a 15 VDC nominal voltage, it is always
C16i
C16i ...
A05516_01_Y00_01 HBM: public
Electrical connection
RS-485 / 4-wire BUS
C16i ...
17