Rockwell Automation SA3100 AutoMax Distributed Power System User Manual
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Glossary
A-7
linearity: a measurement of how closely a ratio (e.g., output/input) follows a straight
line.
link (fiber-optic): in Distributed Power systems, the fiber-optic cabling which connects
a UDC module to a PMI.
LOCAL (variable): a variable that is not defined in the rack configuration and is
therefore accessible only to the application task in which it is defined.
loop: a control scheme in which a reference input to a device is compared to a
feedback signal from the device for purpose of regulation. Any error is amplified to
affect the input to the device to reduce the error. All other “functions” in the loop can be
viewed as gain functions.
inner loop; a control loop between the major and minor loops.
major loop; also called outer loop: For Distributed Power drive systems, refers to
the application task that provides reference values to the control algorithms in the
PMI. The major loop(s) execute on the UDC module or AutoMax Processor. If they
execute on the UDC module, they are called UDC tasks.
minor loop: synonym for control algorithm. Executes on the PMI.
Manchester encoding: a means by which separate data and clock signals can be
combined into a single, self-synchronizable data stream, suitable for transmission on a
serial channel.
maximum recommended pulling tension (fiber-optic cabling): the maximum load
which can be applied along the axis of a cable without breaking the fibers.
M-contactor: a contactor used to switch power to/from the motor and/or drive.
megohmmeter (megger): a direct-reading instrument, scaled in megohms, for
measuring electric resistance.
microbend loss: attenuation caused by excessive cable bending or manufacturing
flaws.
micron: one-millionth of a meter (10
-6
)
minimum loaded bend radius (fiber-optic cabling): the smallest radius to which a
cable can be bent during installation.
minimum bend radius: the smallest radius that cable can be bent to without
damaging the fiber; usually 10% of the loaded bend radius.
mode (DPS drive control): a PMI operating state.
mode field diameter (fiber-optic cabling): the actual diameter of a single-mode fiber
through which light travels.
motoring: mode of operation wherein the motor is delivering power to a mechanical
load. Motor rotation and torque are both in the same direction.
motor load: the horsepower (speed and torque) required to drive a machine.