Glossary

A feedback device which is used in a brushless servo system to provide information for the amplifier to electronically commutate the motor. The device uses a magnetized wheel and Hall Effect sensors to generate the commutation signals.

Refers to the ability of a controller to respond to an event immediately, without delay. While PLCs are inherently designed for this, PCs can be trickier. To be a hard, real-time controller, a PC-based controller's software must be considered the highest priority task, and made independent of the rest of the PCs task.

A switch that is operated by some part or motion of a power-driven machine or equipment to alter the electric circuit associated with the machine or equipment.

A positive-action mechanical friction device. Normal configuration is such that when the power is removed, the brake is set.

Sometimes called static torque, holding torque specifies the maximum external torque that can be applied to a stopped, energized motor without causing the rotor to rotate. Generally used as a figure of merit when comparing motors.

A reference position for all absolute positioning movements. Usually defined by a home limit switch and/or encoder marker. Normally set at power-up and retained as long as control system is operational.

Locating a unique reference position at power-up for axis calibration.

A Unit of measure of Power. One horsepower is equal to 746 watts. The measurement of Rotary power must take speed and torque into account. Horsepower is a measure of a motor's torque and speed capability. Formula:         HP = Torque (lb-in.) x Speed (RPM)/63,025 HP = Torque (lb-ft.) x Speed (RPM)/5,252 HP = Volts x

A host is a computer that is connected to a network. The term usually refers to a computer that is connected to a TCP/IP network, including the Internet. Each host on such a network has a unique IP address.

The console at which an operator or mechanic interacts with the controller of a packaging machine or line. An HMI, or MMI (man-machine interface) or OI (operator interface), often is a computer display with a PC or industrial computer built into or connected to run specialized HMI software.