Technical information

184
230V FX Series Positioning Drive Reference Manual
Full Load Speed
The speed of a motor operated with rated voltage and full load torque.
Gain
The ratio of system output signal to system input signal. The control loop parameter that determines system
performance characteristics.
Hall-Effect Sensor
Commutation method used in some brushless servo amplifiers to electronically commutate the motor. The
rotor position detection device uses a magnetized wheel and Hall-Effect sensors to generate the
commutation signals.
Holding Torque
Sometimes called static torque, it specifies the maximum external force or torque that can be applied to a
stopped, energized motor without causing the rotor to rotate continuously.
Home Position
A reference position for all absolute positions. Usually defined by a home limit switch and/or encoder
marker. Normally set at powerup and retained for as long as the control system is operational.
hp
Horsepower. One horsepower is equal to 746 watts. Since Power = Torque x Speed, horsepower is a
measure of a motor’s torque and speed capability (e.g., a 1 HP motor will produce 36 lb-in. at 1800 RPM).
Host Computer
A main computer system which is connected to a controller or controllers. The host computer in distributed
control systems is frequently involved with controlling many remote and distributed motion control devices.
It may also be used for off-line tasks such as program preparation, storage and supervisory control and
evaluation.
Hunting
The oscillation of the system about a theoretical steady-state value usually at less than 5 Hz.
Hysteresis
For a system with an analog input, the output tends to maintain it’s current value until the input level
changes past the point that set the current output value. The difference in response of a system to an
increasing input signal versus a decreasing input signal.
IC
Abbreviation for integrated circuit.
I/O
Input/Output. The reception and transmission of information between control devices. In modern control
systems, I/O has two distinct forms: switches, relays, etc., which are in either an on or off state, or analog
signals that are continuous in nature generally depicting values for speed, temperature, flow, etc.
Incremental Motion
A motion control term that is used to describe one step of relative motion for each step command received.
Incremental Motion System
A control system which changes the load position in discrete steps.