HBK HLCM, Инструкция по монтажу

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11
HLCM
CONNECTION
8 CONNECTION
Load cells can be connected either to Carrier‐frequency‐amplifiers or DC‐amplifiers.
The load cell connection cable should be routed so that any condensed water or damp­
ness forming on the cable can drip off. It must not be led to the load cell. In addition, it
must be ensured that no dampness can penetrate the open end of the cable.
6-wire circuit
1)
Wiring code
(white)
(black)
(grey)
Excitation (+)
(green)
(red)
Excitation (-)
Sense (-)
Signal (+)
(blue)
Sense (+)
Signal (-)
Shield, connected with housing
1) 1)
When connecting to amplifiers in 4‐wire technique you must connect the wires blue to green and
black to gray. The following deviations occur with unshortened cables (3 m):
•
sensitivity -0.2 %
•
TKC -0.01 % / 10 K
Notice
Electric and magnetic fields often cause interference voltages to be coupled into the mea­
surement circuit. Therefore:
S
Only use shielded, low capacity measurement cables (measurement cables by HBK
meet these requirements).
S
Do not route these measurement cables in parallel to power and control lines. If this is
not possible, protect the measurement cable (e.g. by means of steel‐sheathed pipes).
S
Avoid the leakage fields of transformers, motors and contactors.
Parallel connection of several weighing modules
The load cells of the weighing modules can be connected electrically in parallel by con­
necting up the wire ends with the same color . For this HBK offers the junction boxes
VKK... or for use in intrinsically safe circuits and hazardous areas the junction box VKEX
(EEx e II T6). The output signal will then be the mean value of the individual output
signals.