HBM T40B, Mounting Instructions

Page: 34 / 164

Electrical connection
32
A03452_15_X00_00 HBM: public
T40B
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 with e.g.
steel conduit.
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 devices in the measuring chain to the same protective earth
conductor.
S
In the case of interference due to potential differences (compensating cur­
rents), the connections between supply voltage zero and housing ground
must be broken at the amplifier and a potential equalization line established
between the stator housing and the amplifier housing (copper conductor, at
least 10 mm
2
wire cross‐section).
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
The stator housing has two 7‐pin plugs, an 8‐pin plug and a 16‐pin plug.
The supply voltage connections and shunt signal connections of plugs 1 and 3
are each electrically interconnected, but are protected against compensating
currents by diodes. There is also a self‐resetting fuse (multifuse) to protect the
supply connections against overload by the stator.