Rockwell Automation 6000 PowerFlex Medium Voltage Variable Frequency Drive Installation Instructions - Manual (Page 42)

42 Rockwell Automation Publication 6000-IN006A-EN-P - April 2014
Chapter 3 Drive Electrical Installation
Electrical Drawings Before connecting any power cables or control signal wiring, review and
understand the information contained in the project-specific Electrical
Drawings.
They contain critical information such as:
• Minimum power cable insulation ratings and sizes
• Power terminal locations and designations
• Terminal block designations for all connections to external customer
control signal wiring and control power supply cables.
The practice used within the PowerFlex 6000 electrical drawing is based on the
IEC (International Electrotechnical Commission) standard. The symbols used to
identify components on the drawings are international.
Device designations used on the drawings and labeling are explained on each
drawing set.
Wiring identification uses a source/destination wire number convention on
point-to-point multi-conductor wiring and in situations where the system is
warranted. The wire-numbering system of unique, single numbers for multi-drop
and point-to-point wiring continues to be used for general control and power
wiring.
Wiring that connects between the sheets or that ends at one point and starts at
another point on a drawing has an arrow and drawing reference to indicate the
ongoing connection. The drawing reference indicates the sheet and the X/Y
coordinates of the continuation point. The reference system is explained on a
sheet in each drawing set. The unique wire numbering system serves as
confirmation that the correct wire is being traced from sheet-to-sheet or across a
drawing. Wires in multi-conductor cables are typically identified by color rather
than by number. Abbreviations used to identify the colors on the drawings are
fully identified on a sheet in the drawing set.
Grounding System
Requirements As a general guideline, the ground path must be of sufficiently low impedance
and capacity that:
• the rise in potential of the drive ground point when subjected to a current
of twice the rating of the supply should be no higher than 4 V over ground
potential
• the current flowing into a ground fault is of sufficient magnitude to cause
the protection to operate.
The general grounding point must be reliably connected with the grounding
network.