Manual

134 Rockwell Automation Publication DRIVES-IN001M-EN-P - March 2014
Glossary
IGBT Insulated gate bi-polar transistor. The typical power semi conductor device used
in most PWM AC drives today.
mil 0.001 inches
MOV Metal oxide varistor
NEC United States National Electric Code NFPA70
Peak Cable Charging Current The current required to charge capacitance in motor cable. This capacitance has
various components:
• conductor to shield or conduit
• conductor to conductor
• motor stator to motor frame
PVC Polyvinyl chloride (typically thermoplastic)
RC Network An electric circuit composed of resistors and capacitors driven by a voltage or
current source. RC circuits can be used to filter a signal by blocking certain
frequencies and passing others.
RC Snubber Circuit Resistor-capacitor snubber circuit (see RC Network
)
RWR Reflected waver reducer, an RL network mounted at or near the drive, used to
reduce the amplitude and rise time of the reflected wave pulses. Catalog number
1204-RWR2-09-B or 1204-RWR2-09-C.
Shielded Cable containing a foil or braided metal shield surrounding the conductors.
Usually found in multi-conductor cable. Use a shield coverage of at least 75%.
Signal Individual hard wired analog inputs or outputs, typically used to issue reference
commands or process information to or from the drive.
STP Cable Shielded twisted-pair cable.
Surrounding Air Temperature The temperature of the air around the drive. If the drive is free standing or wall
mounted, the surrounding air temperature is room temperature. If the drive is
mounted inside another cabinet, the surrounding air temperature is the interior
temperature of that cabinet.
TIA Telecommunications Industry Association
Ter minato r A resistor–capacitor (RC) network mounted at or near the motor, used to reduce
the amplitude and rise time of the reflected wave pulses.
Catalog number 1204-TFxx.
THHN Thermoplastic high heat-resistant nylon-coated. A U.S. a designation for a
specific insulation material, temperature rating, and condition of use (suitable for
dry and damp locations) for electrical wire and cable.