Rockwell Automation WebPak 3000 DC Drives Hardware Reference, Installation and Troubleshooting - Manual (Page 88)

B-4 WebPak 3000 DC Drive Hardware Reference
Wiring Instruction
Motor Cable
• The cables between cabinet / armature output and DC-motor armature shall be 3-wire screened
cable (+, - and earth conductor green/yellow) as specified in Figure B.2.
• The cables between field supply output and DC-motor field shall be 2-wire screened cable.
• The screen must be tinned copper braid or tinned steel braid. It must be solidly connected to the
control cabinet ground busbar or ground stud of the converter with large connection area and good
conductivity.
• The screen on the motor side must be solidly connected to the motor housing providing large
connection area with good conductivity.
• If screened cables are not available (limited by the obtainable cross sections) the individual
conductors and protective conductors must be run in steel conduits or enclosed metal cable ducts
also connected to ground at both ends.
• All leads shall have the same cross section
(earth conductors with cross section. >16 2 : min. 16 2 or 50% of armature lead)
• The connections between filter and converter should be as short as possible!!
These conductors must be bound together (with tie wrap) forming a triangle in cross section.
• Power and signal leads inside the cabinet must be distanced.
Analog or Digital Signals (e.g. reference, feedback signals),
Control Signals (Relays)
These signal leads must be screened cable as specified in Figure B.2.
The individual conductors must be stranded, but twisted pairs are not required.
The screen must be grounded at both ends.
Stranded copper wire
Plastic insulation
Inner plastic sheath
Compact screen of galvanised (tinned) copper or steel braid
Outer plastic jacket
Figure B.2: Specification for screened cable