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`Standards World Wide Websiteat http://standards.ieee.
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` controller
`
`conforms to manufacturer’s recommendations.
`ectusat
`(NEC/NESC)
`[86
`ae (electric pipe heating Systems) A devi a
`reed ‘ .aek a system by comparing a signal from a
`soningopal oat emo
`Toler as usedin electric oat ay heeatenioined YalubhGon-
`.
`Pipe heating systems,regulate tem-
`peratures on the system and can be referred to as temperature
`controllers or thermostats. Controller sensors can be mechan-
`ical (bulb, bimetallic) or electrical (thermocouple,resistance-
`temperature detector [RTD] thermistor),
`(2) 'Acdevioesingett
`(PE) 622A-1984r, 622B-1988r
`‘
`p of devices that serves to govern, in
`some predetermined manner,the electric power delivered to
`the apparatus to which itis connected.
`(NEC/NESC)
`[86]
`(3) (packaging machinery) A device or groupofdevicesthat
`serves to control in some predetermined mannerthe apparatus
`to which it is connected.
`(IA) 333-1980w
`(4) The componentof a system that functions as the system
`controller. A controller typically sends program messages to
`and receives response messages from devices.
`?
`(IM) 488.2-1992
`(5) (A) A functional unit in a computer system that controls
`one or more units of the peripheral equipment. Synonym: pe-
`ripheral controlunit. See also: dual-channelcontroller; input-
`output controller. (B) In robotics, a processor that takes as
`input desired and measuredposition; velocity or other perti-
`nent variables and whose output.is a drive signal to a con-
`trolling motoror activator. (C) A device through which one
`can introduce commands to a control system.
`'
`(C) 610.10-1994
`(6) The entity that initiates RamLink transactions. There is
`exactly one controller on each RamLink ringlet.
`(C/MM) 1596.4-1996
`(7) (CAMACsystem) See also: CAMACcrate.
`(8) See also: SBus Controller.
`(BA/C) 1496-1993
`Controller See: SBus Controller.
`controller, automatic (process control) A device that operates
`automatically to regulate a controlled variable in response to
`a command and a feedbacksignal. Note: The term originated
`in process control usage. Feedback elementsandfinal control
`elements may also be part of the device. See also: control
`system, feedback.
`(PE)
`[3]
`controller characteristics (thyristor) The electrical character-
`istics of an ac power controller measured or observed atits
`input or output terminal.
`(IA) 428-1981w
`controller current (thyristor) The current flowing through the
`terminals of the controller.
`(IA) 428-1981w
`controller diagram (electric-power devices) A diagram that
`showstheelectric connections between the parts comprising
`the controller and that shows the external connections.
`(IA)
`[60], 270-1966w
`controller equipment (thyristor) An operative unit for ac
`power control comprising one or more thyristor assemblies
`together with any input or output transformers, filters, other
`switching devices and auxiliaries required by the thyristor ac
`powercontroller to function.
`(IA) 428-1981w
`controller faults (thyristor) A fault condition exists if the con-
`duction cycles of some semiconductors are abnormal.
`(IA) 428-1981w
`controller ON-state interval (thyristor) The time interval in
`which the controller conducts. Note: It is assumed that the
`starting instant of the controller ON-state interval is coinci-
`dent with the starting instant ofthe triggerpulse.
`(IA) 428-1981w
`(thyristor) A transformer
`transformer
`controller power
`within the controller employed to pee isolation or the
`i
`voltage or current, or both.
`transformation of
`2
`(IA) 428-1981
`controller section (thyristor) That part of a controller circuit
`containing the basic control elements necessary for control-
`ling the load voltage.
`(IA), 428-1981
`
`217
`
`controlmode
`
`controller, self-operated(automaticcontrol)Acontroldevice
`_
`in whichall the energy to operatethefinal controllingelement
`is derived from the controlledsystem throughthe prit
`detecting element.
`ee.
`(PEye
`controllers for steel-mill accessorymachinesControllersfor
`_ machinesthat are not used directlyin theprocessingof steel,
`such as pumps, machine tools, etc. See also: electriecon-
`troller.
`(IA) [60]
`controllers for steel-mill auxiliaries Controllers for machines
`that are used directly in the processingofsteel, such as screw-
`downs and manipulators but not cranes and main rolling
`drives. See also: electric controller.
`(IA)
`[60]
`controller, time schedule (process control) A controller in
`which the command(orreference input signal) automatically
`adheres to a pre-determined time schedule. Note: The time
`schedule mechanism may be programmed to switch motors
`or other devices.
`sai
`1otEjie
`piel eee
`controlling element, final That forward controllingelement
`which directly changes the value of the manipulated variable.
`(CS/PE) [3]
`controlling elements The functional componentsof a control-
`ling system. See also: control system, feedback.
`:
`(IM/PE) [120],[3]
`controlling elements, forward The elements in the controlling
`system that change avariable in response to the actuating
`signal. See also: control system, feedback.= t—~tS
`(IM/PE)[120],[3]
`controlling means(of an automatic control system) Consists of
`those elements that are involved in producing a corrective
`action.
`(PE) 94-1970w
`controlling section A length of track consisting of one ormore
`track circuit sections, by means of which the roadwayele-
`ments or the device that governs approach to or movement
`within a block are controlled.
`(EEC/PE)
`[119]
`controlling system (1) (automatic control system without
`feedback) Thatportion of the control system thatmanipulates
`the controlled system.
`|
`(IM/PE) [120], [3]
`(2). (control system feedback) Theportion that compares
`functionsof a directly controlled variable and a command and
`adjusts a manipulated variable as.a function ofthedifference.
`Note: It
`includes the reference input elements; summing
`point; forward and final controlling elements; and feedback
`elements. See also: control system, feedback.
`(IM/PE) [120], [3]
`controlling voltage, composite See: composite controlling
`voltage.
`exingenssm)
`control machine (A) (railroad practice) An assemblage of
`manually operated levers or other devices for the control of
`signals, switches, or other units, without mechanicalinter-
`locking, usually including a track diagram with indication
`lights. See also. car retarder. (B) (railroadpractice) A group
`of levers or equivalent devices used to operate the various
`mechanisms and signals that constitutethe car retarderin-
`stallation. See also: car retarder, centralized traffic-control
`system.
`}
`'
`_(EEC/PE) [119]
`control, manual Those elements in the excitationcontrol sys-
`tem which provide for manual adjustment of the synchronous
`machine terminal voltage by open-loop control. ==
`;
`ddiviaih
`:
`(PE) 421-1972s
`control mechanism (control systems for steam turbine-gen-
`erator units) Includesall systems, devices, and mechanisms
`between a controller and
`the controlled valves.
`peng’
`(PE) 122-1985s
`control metering point (1) (tie line) The location ofthe me-
`tering equipmentthat is used to measurepoweronthetie line
`for the purpose ofcontrol. See also: center ofdistribution;
`power system.
`(PE)
`[54]
`(2) (electric power system) The actual orequivalentlocation
`of power flow measurement on anareatieline, =
`(PE) 94-1991
`control mode(thyristor) The starting instantof the controller
`ON-state interval is periodic, The control mode is defined
`
`
`
`4
`
`