Operating Manual EMGZ 321
12.03.2020
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4.5
Connection of the Cable Shield
Cable shields must be
connected as indicated in the
wiring diagram (see Fig. 3 and
4). 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. 5.
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.
4.6
Digital Inputs
The EMGZ321 controller 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. 5: Shield connection
E470009e
