External Power Supply - HBM C16i series Installation Instructions Manual

16
3.2

External power supply

The load cell features a digital output with RS--485 (4--wire) interface. For the power supply an
external DC supply voltage is required.
Power supply unit selection for C16i...:
Procedure for selecting a suitable power supply unit to supply power to the interface 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 15VDC nominal voltage, it is always possible to implement longer cables or
smaller wire cross--sections than with a 12VDC rating.
4. Read off voltage and minimum current for the (plug--in type) power supply unit required. The power
supply unit should be electronically controlled.
Example: 6 load cells require approx. 370mA (this corresponds to the minimum current required
by the power supply unit), the required cable length is to be 100m. At 15VDC, this can be
implemented with a cable cross--section of 0.14mm
2
0.25mm needs to be selected.
Power supply table (when using the HBM interface converter set SC232/422A with an internal
consumption of approx. 70mA):
Sum Sum
Number of
(current con- (
load cells load cells
sumption) *
1 120 mA
2 170 mA
3 220 mA
4 270 mA
6 370 mA
8 470 mA
10 570 mA
12 670 mA
16 870 mA
* incl. HBM interface converter set SC232/422A
Note:
The plug--in power supply unit , included in the scope of delivery for the HBM interface converter set
SC232/422A supplies 12VDC/700mA. So it can be used for operation with max. 12x C16i load cells.
3.3 Command set C16i...
Please request the separate documentation of our AD104* electronics, if required.
* Operating instructions available in German + English language versions
Wägezelle
Nominal voltage 12VDC
ti ) *
Wire cross--section
2
0.14mm 0.25mm
352 m
176 m
117 m
88 m
59 m
44 m
35 m
29 m
22 m
Load cell
• •
2
. At 12VDC, a minimum cross--section of at least
Maximum cable length
between converter and junction box
2 2
0,5mm
500 m 500 m
314 m 500 m
210 m 419 m
157 m 314 m
105 m 210 m
79 m 157 m
63 m 126 m
52 m 105 m
39 m 79 m
MA.C16i.0def -- 284.00--1053.4 -- Version a -- 05.04.2001
Capteur de pesage
Nominal voltage 15VDC
Wire cross--section
2 2
0,14mm 0,25mm
500 m 500 m
296 m 500 m
197 m 352 m
148 m 264 m
100 m 176 m
74 m 132 m
59 m 106 m
49 m 88 m
37 m 66 m
français (page 18 ... 25) = en préparation
C16i...
2
0,5mm
500 m
500 m
500 m
500 m
352 m
264 m
211 m
176 m
132 m