Rockwell Automation SA3100 AutoMax Distributed Power System - Manual (Page 56)

A-12 AutoMax Distributed Power System Overview
UDC task: an application task written in Control Block language that runs on a
UDC (Universal Drive Controller) module. This task usually consists of an outer
control loop and associated logic.
thermal overload relay: an overload relay that functions (trips) in response to the
temperature rise in the sensing element caused by excessive current.
thyristor: device controlling the current through the Power Module. Synonymous with
silicon controlled rectifier in Reliance documentation.
thyristor assembly: an electrical and mechanical assembly of thyristors which
includes additional components such as heat sinks.
tick: for AutoMax Processors, a unit of time ranging from 0.5 milliseconds to 10
milliseconds (in.5 millisecond increments). The programmer assigns a tick rate to the
AutoMax Processor. The Universal Drive Controller operates at a fixed tick rate of 0.5
milliseconds.
tunable (variable): a local variable whose value can be tuned, i.e., changed within
limits, by the operator through the use of the AutoMax Executive software. The value
of a tunable variable cannot be changed by application tasks.
undershoot: the amount that a controlled variable is less than the desired value after
a change of input.
velocity of propagation: the transmission speed of optical energy in a length of fiber-
optic cable compared to the speed of light in free space.
watchdog: a device or routine which continuously verifies that a microprocessor is
running.
W/D (Wiring Diagram): reference drawing, including schematic diagrams, component
locations, rating tables, and replacement parts tables for standard assemblies
included in a drive system.
W/E (Elementary Diagram): schematic diagram showing electrical connections of
electronic and electrical devices in a drive system.
W/F (Flow Diagram): diagram showing the relationship between the drive sections,
motors, regulation schemes, and mechanical components in block format. This
drawing type may also show the network and remote I/O arrangement, as well as any
other communication lines, in a single line diagram format.
W/I (Interconnection Diagram): diagram showing all interconnecting field wiring
between individual assemblies or components provided by Reliance. These diagrams
are provided optionally in place of the special cabling instructions in the elementary
diagrams (W/E).
W/L (Panel Layout Diagram): diagram showing the physical arrangement of the
electrical devices on each control panel, including customer connection terminals with
wire numbers.
W/M (Motor Control Center Diagram): diagram showing the physical location of the
units or compartments within each motor control center and the reference elementary
diagram (W/E) for each unit.