Rockwell Automation SA3100 AutoMax Distributed Power System - Manual (Page 50)

A-6 AutoMax Distributed Power System Overview
full-wave rectification: rectifying the positive half-cycle of the AC sine wave and the
negative half-cycle of the AC sine wave (by inversion) so that the output voltage
contains two positive half-sine pulses for each AC input voltage cycle.
gain: ratio of output to input. In Distributed Power systems, gain values are held in
pre-defined Local Tunable variables. Values can be generated by the PMI via self-
tuning commands.
gate: the control element of a power device. When a small positive voltage is applied
to the gate momentarily, a power device will conduct a current.
half-wave rectification: rectification of one-half of the AC input waveform, typically
the positive half. See also full-wave rectification.
horsepower (HP): a measure of the amount of work that a motor can perform in a
given period of time.
1 HP = 0.746 KW = [Torque (lb.-ft.) x Speed (RPM)] / 5250.
IGBT (insulated gate bipolar transistor): a high-frequency switching device controlled
by voltage applied to the gate terminal.
induction motor: An alternating current motor in which the primary winding on one
member (usually the stator) is connected to the power source. A secondary winding
on the other member (usually the rotor) carries the induced current. There is no
physical electrical connection to the secondary winding, its current is induced.
integrator: a device which provides an output which is a summation of inputs over
time.
IR compensation: a circuit used to compensate for the voltage drop across the
resistance of the AC or DC motor circuit and reduce or eliminate the resultant
reduction in speed with loading; also provides a way to improve the speed regulation
characteristics of the motor. Drives that use a tachometer-generator for speed
feedback do not use an IR compensation circuit because the speed regulator, via the
tachometer, will inherently compensate for the loss in speed.
IR drop (motor): the voltage drop equal to the product of the armature current passing
through the motor and the armature resistance of the motor. Expressed in percent of
rated voltage.
jacket: in cabling, a layer of plastic insulation surrounding the wires comprising the
cable.
jog: in drive control, non-maintained, momentary low speed operation of a drive in
order to accomplish a small movement of the driven machine.
LED (light emitting diode): a semiconductor device that produces diffused light. The
LED’s light intensity is proportional to the amount of current flowing through it.
light detector: a fiber-optic component that converts light energy into electrical
energy. Light detectors can be semiconductor photodiodes or phototransistors.
light source: a fiber-optic component that converts electrical energy into light energy.
Light sources can be light emitting diodes (LEDs) or injection laser diodes.