Electrical connection
32
A4429-3.0
HBM: public
T40FH
Electrical and magnetic fields often induce interference voltages in the measur
ing circuit. Therefore:
S
Use shielded, low-capacitance measurement cables only (HBM cables fulfill
both conditions).
S
Only use plugs that meet EMC guidelines.
S
Do not route the measurement cables parallel to power lines and control
circuits. If this is not possible, protect the measurement cable witha steel
conduit, for example.
S
Avoid stray fields from transformers, motors and contact switches.
S
Do not ground the transducer, amplifier and indicator more than once.
S
Connect all the devices in the measuring chain to the same protective con
ductor.
S
In the case of interference due to potential differences (compensating cur
rents), 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, minimum 10 mm
2
wire crosssection).
S
Should differences in potential occur between the machine rotor and stator
because of unchecked leakage, for example, this can usually be overcome
by connecting the rotor definitively to ground, e.g. with a wire loop. The sta
tor must be connected to the same (ground) potential.
6.3
Connector pin assignment Option 4, Code SU2, DU2,
HU2
The stator housing has two 7-pin connectors, an 8-pin connector and a 16-pin
connector.
The supply voltage and shunt signal connections of connectors 1 and 3 are
each electrically interconnected, but are protected against compensating cur
rents by diodes. There is also a self-resetting fuse (multifuse) to protect the
supply voltage connections against overload by the stator.
