FMS EMGZ621A, Руководство по эксплуатации, Страница: 12 / 40

Operating Manual EMGZ621A
12
7.3 Mounting the Force Sensors
Mounting of the force sensors is done referring to the FMS Installation manual which is
delivered together with the force sensors. The connection between the force sensors and the
electronic unit is done using 2x2x0.75mm
2
[AWG 18] shielded twisted pair cable. (With cable
length below 15m, 2x2x0.25 mm
2
[AWG 23] is also suitable.) The cable must be installed
separate from power lines.
Wiring to the terminals of the electronic unit is done according to the wiring diagram (fig. 6).
If two force sensors are used per measuring point, the cables are wired parallel (ref. to wiring
diagram, channel 1). If wiring is made using 6 wire circuit (ref. to wiring diagram, channel 2)
the solder bridges must be modified (ref. to „8.2 Configuring the electronic unit“).
Force sensor excitation can be made using 5VDC (default) or 10VDC (ref. to
„8.2 Configuring the electronic unit“).
Note
The force sensor signal consists of only a few mV and is therefore susceptible to external
influences to the cable. To increase immunity to interfering use one pair of the twisted pair
cable for +signal and –signal.
Note
Connecting the shield of the signal cable to the electronic unit and to the force sensor may
cause ground circuits which may interfere the measuring signal massively. 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.