DS Europe 500QD Series, Instructions Manual

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7) ELECTRICAL CONNECTIONS OF NOT AMPLIFIED LOAD CELLS
7.1 CABLE OR CONNECTOR?
For outdoor applications and for all the industrial environments, the cable connection is
preferable.
The mating connector, even if sealed, has always inside dead volumes with air and
the air, due to the thermal variations, exchanges humidity which, in long periods, brings
oxidations on the electrical contacts, electrical jumpers of moist dust acting directly on the
strain-gauge bridge and, consequently, introducing shifts of the zero and instability of the
measure.
7.2 ELECTRICAL CONNECTION:
Load cells without built-in electronics (mV/V output)
Meaning Black sheath cable
Grey sheath
DIN47100 cable
Connector
Load cells
BC301-2-3
Load cells
BC304-5
- Power supply
Black Brown 4 Green Black
+ Power supply
Red Yellow 1 Red Red
- Signal
White White 3 Colourless White
+ Signal
Green Green 2 Blu Green
Calibration
Yellow Grey 5
Calibration
activation
Green Grey+Green 5+2
The screening sheath is not connected to the body of the cell.
7.3 POWER SUPPLY OF LOAD CELLS WITHOUT BUILT-IN ELECTRONICS:
The standard and recommended voltage is: 5 or 10 V stabilized.
The cells can accept up to 15 V.
The upper voltage value is limited: by the heat dissipation capability of the sensors, by the
ambient temperature and by the warm-up time wanted.
In the "final test" the cells are tested with excitation: 10 V.
The highest the power supply, the highest the electrical signal but the longer it will be
necessary to wait to reach thermal stability (=warm up time) of electrical signal because of
heating due to flowing electrical current.
The external power supply generator is to have a low over imposed ripple noise (linear
generators are to be preferred to switching types).