Rockwell Automation 6000 PowerFlex Medium Voltage Variable Frequency Drive Installation Instructions - Manual (Page 43)

Rockwell Automation Publication 6000-IN006A-EN-P - April 2014 43
Drive Electrical Installation Chapter 3
Attach an external ground cable to the main ground bus, in compliance with
applicable national and local electrical codes.
Run the system ground cable separately from power and signal wiring so that
faults:
• do not damage the grounding circuit
• will not interfere with or damage the protection or metering systems, or
cause undue disturbance on power lines.
Power Cable Insulation
Requirements Incoming line power cable ratings are shown on the Electrical Drawings and
reflect what would typically be supplied, based on line voltage rating.
All voltage ratings for outgoing motor cables shown are line-to-ground rated
power-frequency voltages and line-to-line power-frequency voltages.
Select cables of appropriate voltage classes when the incoming line grid-side
voltage class is different from the outgoing line motor-side voltage class.
Standard power cable ratings commercially available can vary in different regions
around the world. Cable must meet the minimum line-to-ground and line-to-
line requirements.
IMPORTANT The primary grounding cable must have a diameter of at least 50 mm
2
and
meet all applicable national and local electrical codes.
Table 9 - Cable Insulation Requirements for Outgoing Motor Cables
System Voltage
(V, RMS)
Cable Insulation Rating (kV) - Motor Side
Line-to-Ground Rated
Power Frequency Voltage U
o
Line-to-Line Rated
Power Frequency Voltage U
3000 ≥3.6 ≥6
3300 ≥3.6 ≥6
6000 ≥6.0 ≥10
6600 ≥6.0 ≥10
10,000 ≥8.7 ≥15
IMPORTANT Follow the recommended field power cabling insulation levels to help ensure
trouble-free start-up and operation. The cable insulation level must be
increased over that which would be supplied for an across-the-line application
with the same rated line-to-line voltage.