Rockwell Automation 1336T Wiring and Grounding Guide, (PWM) AC Drives - Manual (Page 133)

Rockwell Automation Publication DRIVES-IN001M-EN-P - March 2014 133
Glossary
Ambient Air Air around any equipment cabinet.
See surrounding air for more detail.
Armored A fixed geometry cable that has a protective sheath of continuous metal.
Capacitive Coupling Current or voltage that is induced on one circuit by another because of their close
physical proximity. For drive installations it is generally seen in two areas:
• Coupling between motor leads of two drives, such that the operating drive
induces voltage onto the motor leads (and thus the motor) of a non-
operating drive.
• Coupling between the conductors or shields of motor leads that creates a
requirement for more current than the motor itself demands.
CIV (Corona Inception Voltage) The amplitude of voltage on a motor or other electrical winding that produces
corona (ionization of air to ozone). CIV is increased by adding phase paper,
placing windings in the proper pattern and reducing or eliminating air bubbles
(voids) in the varnish applied.
Common Mode Core A ferrite bead or core that can be used to pass control, communications or motor
leads through to attenuate high frequency noise. Catalog number/part number
1321-M
xxx.
Common Mode Noise Electrical noise, typically high frequency, that is imposed on the ground grid,
carriers in an electrical system.
Conduit Conductive ferrous electrical metal tubing used to contain and protect individual
wires.
Damp Wet locations per U.S. NEC or local code.
Discrete Individual, hard-wired inputs or outputs, typically used for control of the drive
(start, stop, and so on).
Dry Dry locations per Per NEC Article 100 or local code.
dV/dt The rate of change of voltage over time.
EIA Electronic Industries Alliance
Fill Rates The maximum number of conductors allowed in a conduit, as determined by
local, state or national electrical code.
Fixed Geometry Cable whose construction fixes the physical position of each conductor within
the overall coating, usually with filler material that prevents individual
conductors from moving.