HBM C16i series, Mounting Instructions

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Electrical connection
C16i
A05516_01_Y00_01 HBM: public
17
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).
UB
GND
RB (RX+)
RA (RX-)
TB (TX+)
TA (TX-)
white red grey green black blue
GND UB RB (RX+) RA (RX-) TB (TX+) TA (TX-) GND UB RB (RX+) RA (RX-) TB (TX+) TA (TX-)
Converter
(SC232/422B)
PC
C16i ... C16i ...
RS-232
RS-485 / 4-wire BUS
white red grey green black blue
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