Xylem IM043 AQUAVAR Variable Speed Pump Control - Manual (Page 79)

• Take care not to damage the shield cross section when connecting it to the continuing lines.
This raises the RF resistance of the shield and radiates rather than discharges the RF energy
traveling on the shield. Shields, particularly those on control cables, must not be routed through
pin contacts (plug connectors).
• When shielded cables must pass through a plug connection, use the metallic hand guard of the
plug for the continuation of the shield. It is strongly recommended that the shield be
uninterrupted whenever possible.
• When selecting shielded cable for use as motor leads, it is important to select a cable which is
designed for operation at the frequencies and power levels involved. Improper selection of
motor cable can cause high potential to exist on the shield. This could cause damage to the
inverter and other equipment and could pose a safety hazard.
• Separate power and control wiring. Never run transducer or RS485 wire in same conduit as the
power wiring.
• Use metal conduit that is grounded.
• Keep peripheral devices and machines as far from the ground cables as possible. Where
possible, use separate ground on the AQUAVAR.
• Do not use enclosure of AQUAVAR as ground. The enclosure itself should be grounded.
• Use shielded (armored VFD) cable for power cables. (i.e.: Belden wire and cable, Olflex cable.)
Appendix C
78