Figure 66: Shielded control cables
Grounding of shielded control cables
Correct screening
The preferred method in most cases is to secure control and serial communication cables
with screening clamps provided at both ends to ensure best possible high frequency
cable contact.
If the earth potential between the frequency converter and the PLC is different, electric
noise may occur that will disturb the entire system. Solve this problem by fitting an
equalizing cable next to the control cable. Minimum cable cross section: 6 AWG or 16
mm
2
.
Figure 67: Correct screening
1 Min. 6 AWG or 16 mm
2
2 Equalizing cable
50/60 Hz ground loops
With very long control cables, ground loops may occur. To eliminate ground loops,
connect one end of the screen-to-ground with a 100 nF capacitor (keeping leads short).
Figure 68: 50/60 Hz ground loops
5 Electrical Installation
58 Aquavar
®
Intelligent Pump Controller - 150 HP to 600 HP INSTRUCTION MANUAL
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