Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 190)

Glossary-3
Constant Horsepower A range of motor operation where motor speed is controlled by field
Range weakening. Motor torque decreases as speed increases. Since horsepower is speed
multiplied by torque (divided by a constant), the value of horsepower developed by
the motor in this range is constant.
Constant Torque Range A speed range in which the motor is capable of delivering a constant torque, subject
to cooling limitations of the motor.
Contact Reversing A method of reversing motor rotation by the use of two separate contactors, one of
which produces rotation in one direction and the other produces rotation in the
opposite direction. The contactors are electrically (and mechanically) interlocked
so that both cannot be energized at the same time.
Continuous Duty A motor that can continue to operate within the insulation temperature limits after it
(CONT) has reached normal operating (equilibrium) temperature.
Controller A unit, such as a programmable controller or relay panel, that controls machine or
process elements.
CSA Canadian Standard Association.
Current Limiting An electronic method of limiting the maximum current available to the motor. This
is adjustable so that the motor’s maximum current can be controlled. It can also b
preset as a protective device to protect both the motor and control from extended
overloads.
Cursor The intensified or blinking element in a video display. A means for indication
where data entry or editing occurs.
Cycle 1. A sequence of operations that is repeated regularly.
2. The time it takes for one sequence of operations to occur.
DC Direct current.
Definite Purpose Motor A definite purpose motor is any motor design, listed and offered in standard ratings
with standard operating characteristics from a mechanical construction for us
under service conditions other than usual or for use on a particular type of
application (NEMA).
“D” Flange This type of motor mounting is used when the motor is to be built as part
(Motor Mounting) of the machine. The mounting holes of the flange are not threaded. The bolts
protrude through the flange from the motor side. Normally “D” flange motors are
supplied without feet since the motor is mounted directly to the driven machine.
DH-485 Link Data Highway 485 link. An Allen-Bradley token-passing baseband link for a local
area network based on the RS-485 standard.
Diagnostic Pertains to the detection and isolation of an error or malfunction.
Diode A device that passes current in one direction, but blocks current in the revers
direction.