Danfoss MCO 351, Operating Instructions Manual, Page: 50 / 58

8 Appendix
8.1 Abbreviations and Conventions
Abbreviation Explanation
AC Alternating current
AEO Automatic Energy Optimisation
AWG American Wire Gauge
AMA Automatic Motor Adaptation
°
C Degrees Celsius
DC Direct current
EMC Electromagnetic compatibility
ETR Electronic thermal relay
f
M,N
Nominal motor frequency
FC Frequency converter
HO High overload
IP Ingress protection
I
LIM
Current limit
I
INV
Rated inverter output current
I
M,N
Nominal motor current
I
VLT,MAX
Maximum output current
I
VLT,N
Rated output current supplied by the
frequency converter
LCP Local Control Panel
N.A. Not applicable
NO Normal overload
P
M,N
Nominal motor power
PCB Printed circuit board
PE Protective earth
PELV Protective Extra Low Voltage
PM motor Permanent magnet motor
Regen Regenerative terminals
RPM Revolutions per minute
T
LIM
Torque limit
U
M,N
Nominal motor voltage
Table 8.1 Abbreviations
Conventions
Numbered lists indicate procedures.
Bullet lists indicate other information and description of
illustrations.
Italicised text indicates:
•
Cross-reference
•
Link
•
Footnote
•
Parameter name, parameter group name,
parameter option
8.2 Glossary of Key Terms
Absolute value encoder
This is a special form of encoder, as it indicates not only
the speed and direction of rotation, but also the absolute
physical position. This is communicated via transfer of the
position in parallel form or in the form of a telegram in
serial form. Absolute value encoders also come in 2
versions: Single-turn encoders supply an absolute position
via a specific quantity, or via a freely definable number of
rotations.
AMA
Automatic Motor Adaptation - function in parameter 1-29
Automatic Motor Adaptation (AMA) .
ERPM
The speed is defined in relation to the RPM of the encoder.
To underline this, the term
encoder revolutions per minute is
selected as the unit.
Motor/encoder gear ratio
Since the encoder is not necessarily mounted on the
motor itself, the relationship between the nominal motor
speed in RPM and the nominal encoder speed in ERPM
must be specified.
Incremental encoder
This is an encoder system that picks up the speed and the
direction of rotation and transmits on the appropriate
configuration. The number of tracks, and thus the number
of signals, indicate the properties of the encoder system.
There are single-track systems that deliver a pulse signal
dependent on the speed as well as a fixed direction signal.
Dual-track systems deliver 2 pulse signals that are offset 90
degrees. By evaluating the 2 tracks, the direction signal is
also obtained. As well as the 2 tracks of the dual-track
encoder, 3-track encoders deliver an additional
zero-track ,
which emits a signal when the zeros transit is passed
through.
Illustration 8.1 Incremental Encoder Signals
Appendix Operating Instructions
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8 8