Kollmorgen AKD PDMM series, User Manual

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AKD PDMM User Guide | Glossary
Glossary
Term Description
60° & 120°
Hall
Sequences
A method for decoding logic signals produced by Hall effect sensors installed
in an electronically-switched three-phase brushless motor.
Absolute
Encoder
The optical disk of the absolute encoder is designed to produce a digital word
that distinguishes N distinct positions of the shaft. For example, if there are 8
tracks, the encoder is capable of producing 256 distinct positions or an angular
resolution of 1.406 (360/256) degrees.
Absolute
Move
A positioning movement which is referenced to a fixed original position. For
example, if a stage is positioned at +500 mm, an absolute move to +300 mm
would result in a move of 200 mm towards the origin (in the negative direction).
Acceleration
A change in velocity over time. Because velocity is a vector , it can change in
two ways: a change in magnitude and/or a change in direction. In one dimen-
sion, acceleration is the
rate at which something speeds up or slows down.
However, more generally, acceleration is a vector quantity expressing the
change with time of the velocity both in magnitude and in direction.
Accuracy
Accuracy is the distance between the actual position of a mechanical system
and the expected position. It is typically specified in microns or arcsec per
given travel for a deviation of ±
3σ
(sigma).
Actuator
Mechanical device for moving or controlling a mechanism or system. The
actuator is usually a physical mechanism but it can also refer to an artificial
agent/intelligent agent.
In virtual instrumentation actuators and sensors are the hardware com-
plements of virtual instruments. Computer programs of virtual instruments use
actuators to act upon real world objects.
Almirant Almirant is a read only type of screen offered to the end user to control Sinop.
AS Input A safety feature in the drive to prevent servos from being restarted.
ASCII
Short for American Standard Code for Information Interchange. ASCII provides
a one-to-one mapping between alphanumeric characters, and a digital one-byte
word.
Astrolab
Astrolab is a Windows integrated design environment (IDE) containing all the
tools and editors (based on the different IEC 61131 languages) that users need
during the entire life cycle of the machine.
Auxiliary
Encoder Describes the feedback on the load to close the position loop in critical appli-
cations. See Encoder.
Backlash
The backlash is an error in positioning caused by the reversal of travel direc-
tion. It is caused by a clearance between the elements of the mechanical sys-
tem. The backlash also affects the bidirectional repeatability. The backlash
can be compensated by the position controller.
Bandwidth
In computer networking, bandwidth often refers to a data rate measured in
bits/s, for example, network throughput. The reason for the connection of data
rate with the term
bandwidth is that the limit to the data rate of a physical com-
munication link is related to its bandwidth in hertz.
Bandwidth
The frequency at which the small signal response of a servo system begins to
drop off; stage performance is enhanced by increasing servo bandwidth,
although structural resonances typically limit the achievable bandwidth.
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