HBM T12, Manual

Page: 39 / 92

39
T12
A1979 − 10.0 en HBM
9.2 Shielding design
The cable shield is connected in accordance with the Greenline concept. This
encloses the measurement system (without the rotor) in a Faraday cage. It is
important that the shield is laid flat on the housing ground at both ends of the
cable. Any electromagnetic interference active here does not affect the
measurement signal. Special electronic coding methods are used to protect
the purely digital signal transmission between the transmitter head and the
rotor from electromagnetic interference.
In the case of interference due to potential differences (compensating
currents), supply voltage zero and housing ground must be disconnected on
the amplifier and a potential equalization line established between the stator
housing and the amplifier housing (copper conductor, 10 mm
2
wire
crosssection).
Should differences in potential between the machine rotor and stator cause
interference, because of unchecked leakage, for example, this can usually be
overcome by connecting the rotor definitively to ground, by a wire loop, for
example. The stator should be fully grounded in the same way.
9.3 Connector pin assignment
Assignment for plug 1:
Supply voltage and frequency output signal.
6 1
5 7 2
4
3
Binder 423
device plug
Top view
Plug
pin
Assignment Color
code
D-Sub-
plug
pin
1 Torque measurement signal (frequency output;
5 V
1)
/0) wh 13
2 Supply voltage 0 V; bk 5
3 Supply voltage 18 V

30 V bu 6
4 Torque measurement signal (frequency output;
5 V
1)
V) rd 12
5
Measurement signal 0 V;
symmetrical
gy 8
6 Shunt signal trigger 5 V

30 V and TEDS for
torque
gn 14
7
Shunt signal 0 V;
gy 8
Shielding connected to housing ground
1)
RS − 422 complementary signals; with cable lengths exceeding 10 m, we recommend
using a termination resistor R=120 ohms between the wires (wh) and (rd).