ProLine P16800
21
2.8 Shielding
The input and output range of the P16800 are separately and doubly shielded. The double shielding
consists of an inner shield with connection to the circuit ground and a floating, outer shield.
Shielding for current input
Changing input currents generate a changing potential at the base of the measuring resistor
and thus also at the input ground. The input ground is firmly connected to the inner shield, so that an
alternating potential is created between the inner shield and the outer shield. The outer input shield is
connected to the cable shield. Due to the double shielding of the input and the shielding of the out-
put, the alternating currents do not affect the output.
Various shielding configurations are shown in the
chapter.
NOTICE!
There may be signal interference if the shielding is not connected.
The screen terminals must
be correctly connected and must not be left open.
The wire shields are connected to control cabinet ground in the respective control cabinets. Whether
this is done on one or both sides depends on the equipotential bonding and the distance between
the control cabinets.
