10
T4A, T4WA-S3
T4A cable extension:
The T4A torque/screw torque transducer uses a 4–wire connectiontechnique.
If you wish to add a cable extension, this must be carried out using the 6-wire
connection technique. In this case the sensor circuits in the extension cable
must be connected to the bridge excitation circuits of the transducer (for
information on feedback bridges, see Fig.3.1).
Feedback
bridges
1
2
4
3
Measurement signal (+)
wh
. . . . . . . . .
Excitation voltage (+)
bu
. . . . . . . . . . . .
Sensor circuit (–)
gy
. . . . . . . . . . . . . . .
Sensor circuit (+)
gn
. . . . . . . . . . . . . . . .
Excitation voltage (–)
bk
. . . . . . . . . . . .
Measurement signal (–)
rd
. . . . . . . . .
Cable shield
T4A
Extension cable
Fig.3.1:
T4A cable extension
T4WA-S3 cable extension:
The T4WA-S3 torque/screw torque transducer uses the 6–wire connection
technique. A cable extension can be added with no difficulty using 6-wire
connection technique.
3.5
Shielding design
The cable shield is connected according to the HBM Greenline concept, thus
enclosing the measuring system (without rotor) in a Faraday cage (for this it is
important that the shielding on both cable ends is laid flat to the body of the
casing) and preventing potential electromagnetic interference from affecting
the measuring signal.
In the case of interferences due to potential differences (compensating
currents), operating-voltage zero and housing ground must be disconnected
on the amplifier and a potential-equilibration line between stator housing and
amplifier housing must be established (copper conductor, 10mm
2
wire
cross-section).
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