Operating Manual EMGZ 321.EIP
19.10.2017
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3.8
Connection of the Cable Shield
Cable shields must be
connected as indicated in the
wiring diagram (see Fig. 4 and
5). The shield should be
connected only to the
amplifier side. On the force
sensor side, the shield should
stay open. Other
arrangements may cause
ground/earth loops which
may interfere with the
measuring signal. Malfunction can be the results.
If a housing type with PG glands is
used, one must pay heed to a proper connection of the shield. Skinning of the cable and
shield handling are indicated in Fig. 6.
Note
Force sensors deliver a signal of a few mV and are therefore susceptible to external
influences. To increase immunity to interfering use one twisted pair cable for
+signal and –signal. This signal cables must be separated from power lines
.
Note
Connecting the shield of the signal cable to the electronic unit and to the force
sensor may cause ground loops which may interfere with the measuring signal.
Malfunction can be the result. The shield should be connected only to the electronic
unit. On the „force sensor side“, the shield should stay open.
3.9
Digital Inputs
The EMGZ321._.EIP amplifier provides 2 digital inputs for the special functions of
switching between two different gain factors.
The digital inputs are level triggered. A threshold change activates the gain switch:
•
In sensor A from gain factor 1 to gain factor 2
•
In sensor b from gain factor 1 to gain factor 2
Signal Name Terminal #
Sensor
Threshold low
Threshold high
Dig. In 1
5
A
Gain factor 1
Gain factor 2
Dig. In 2
6
B
Gain factor 1
Gain factor 2
Fig. 6: Shield connection
E470009e
