Xylem Aquavar, Instruction Manual

Page: 52 / 172

5.4 Power and control wiring for unshielded cables
Electrical Hazard:
Induced Voltage
• Run motor cables from multiple drives separately. Induced voltage from output motor
cables run together can change equipment capacitors even with the equipment
turned off and locked out. Failure to run output cables separately could result in death
or serious injury.
NOTICE:
Run drive input power, motor wiring, and control wiring in three separate metallic
conduits or raceways for high frequency noise isolation. Failure to isolate power, motor,
and control wiring could result in less than optimum controller and associated equipment
performance.
Because the power wiring carries high frequency electrical pulses, it is important that
input power and motor power are run in separate conduit. If the incoming power wiring is
run in the same conduit as the motor wiring, these pulses can couple electrical noise back
onto the building power grid. Control wiring should always be isolated from the high
voltage power wiring.
When shielded/armored cable is not used, at least three separate conduits must be
connected to the panel option (see figure below).
• Power wiring into the enclosure
• Power wiring from the enclosure to the motor
• Control wiring
Figure 60: Power and control wiring connection
5.5 Grounding
The following basic issues need to be considered when installing an adjustable frequency
drive, so as to obtain electromagnetic compatibility (EMC).
• Safety, grounding: Please note that the adjustable frequency drive has a high leakage
current and must be grounded appropriately for safety reasons. Always follow local
safety regulations.
• High-frequency grounding: Keep the ground wire connections as short as possible.
5 Electrical Installation
50 Aquavar ® Intelligent Pump Controller - 150 HP to 600 HP INSTRUCTION MANUAL