Supply Voltage - HBM T10F Mounting Instructions

25
T10F
The cable screen 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 interferences from affecting
the measuring signal. Special electronic coding methods are used to protect
the transmission path and the rotor from electromagnetic interferences.
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
-
2
amplifier housing must be established (copper conductor, 10mm wire
cross-section).
If potential differences between the rotor and the stator occur in the machine,
due perhaps to unchecked leakage, and give rise to interference, the situation
is usually remedied by fully earthing the rotor, for instance with a wiper or
brush. The stator must be similarly earthed.
Connection cable Length Lead connection
(m)
Kab 139A-6 6 Binder 423 - free ends (Greenline)
Cable extension
Kab 0304A-10 10 7-pin MS socket - 7-pin MS plug
(Greenline)
min. 10 cut to length
Kab 8/00-6GY/3x2Cx0,14C-PVC
3--3101.0247 -- Cable plug series 423

5.1 Supply voltage

The supply voltage is galvanically isolated from signal outputs and calibration
signal inputs. Connect a protective low voltage of 18V ...30V to pin 3 (+) and
pin 2 ( ) of plug 1 or 3. We recommend the use of HBM connection cable
KAB 139A, which may be up to 50m long for the rated voltage (24V) and 20m
long within the rated voltage range. If the permitted cable length is exceeded,
you can supply the voltage in parallel over two connection cables (plug 1
and 3). This enables you to double the permitted length. Alternatively an on--
site power pack should be installed.
If you feed the supply voltage through an unshielded cable, the cable must be
twisted (inteference suppression). We also recommend that a ferrite element
should be located close to the connection plug on the cable, and the stator
should be earthed.