Siemens SIWAREX FTC - Table

HARDWARE CONFIGURATION AND ASSEMBLY
Termination
Clam
p
Signal Comment
X1.37 SIG+ Measurement line +
X1.38 SIG- Measurement line -
X1.39 EXC+ Load cell supply voltage +
X1.40 EXC- Load cell supply voltage -
Table 4-3 Load cell connections
The following rules are to be followed when connecting load cells (WZ).
Using a junction box is required if more than one LC is connected (the LC must be
connected parallel to one-another).
If the distance from the LC to the SIWAREX FTC is greater than the existing length
of the LC connection cable, then the extension box EB is to be used.
2. The cable shielding is normally run on the cable guide supports of the junction box.
In case of the danger of potential equalization currents on the cable shielding,
a potential equalization conductor is to be run parallel to the load cell cable or the
shield clamp is to be used in the junction box to the shield strip. Using the potential
equalization conductor is the preferred method of dealing with EMC
(Electromagnetic Compatibility).
3. Twisted pair cable is required for the indicated wiring:
- Sensor lines (+) and (-)
- Measurement voltage lines (+) and (-)
- Supply voltage lines (+) and (-)
4. The shielding is to be attached to the shielding strip on the SIWAREX FTC.
The two figures below show the load cell connection using 4-wire and 6-wire
systems.
SIWAREX FTC
4-17