Wiring The Functional Safety Options +Q951, +Q952, +Q963, +Q964 Or +Q979 - ABB ACS880-207 Hardware Manual

Notes:
• Do not ground the outer shield of the cable here since it is grounded at the cable entry.
• Keep any signal wire pairs twisted as close to the terminals as possible. Twisting the
wire with its return wire reduces disturbances caused by inductive coupling.
At the other end of the cable, leave the shields unconnected or ground them indirectly via
a high-frequency capacitor with a few nanofarads, eg. 3.3 nF / 630 V. The shield can also
be grounded directly at both ends if they are in the same ground line with no significant
voltage drop between the end points.
Wiring the functional safety options +Q951, +Q952, +Q963,
+Q964 or +Q979
The wiring instructions for the functional safety options +Q951, +Q952, +Q963, +Q964 and
+Q979 are given in separate option manuals. For the manuals, see section
documents.
Electrical installation 63
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