226 ACS550 User’s Manual
Technical Data
Grounding and Routing
Motor Cable Shielding
Motor cables require shielding using conduit, armored cable or shielded cable.
• Conduit – When using conduit:
– Bridge joints with a ground conductor bonded to the conduit on each side of
the joint.
– Bond conduit run to the drive enclosure.
– Use a separate conduit run for motor cables (also separate input power and
control cables).
– Use a separate conduit run for each drive.
• Armored Cable – When using armored cable:
– Use six-conductor (3 phases and 3 grounds), type MC continuous corrugated
aluminum armor cable with symmetrical grounds.
– Armored motor cable can share a cable tray with input power cables, but not
with control cables.
• Shielded Cable – For shielded cable details, see "Motor Cable Requirements for
CE & C-Tick Compliance" below.
Grounding
See "Ground Connections" in "Input Power Connections" above.
For CE compliant installations and installations where EMC emissions must be
minimized, see "Effective Motor Cable Screens" below.
Drive’s Motor Connection Terminals
The drive’s motor and input power terminals have the same specifications. See
"Drive’s Power Connection Terminals" above.
Motor Cable Requirements for CE & C-Tick Compliance
The requirements in this section apply for CE or C-Tick compliance.
Minimum Requirement (CE & C-Tick)
The motor cable must be a symmetrical three conductor cable with a concentric PE
conductor or a four conductor cable with a concentric shield, however, a symmetrical
constructed PE conductor is always recommended. The following figure shows the
minimum requirement for the motor cable screen (for example, MCMK, NK Cables).
Insulation Jacket
Copper Wire Screen
Helix of Copper Tape
Cable Core
Inner Insulation
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