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8 A
nnexes
8.1 Glossar
y
A
Acceleration
The rate of increase of velocity with respect to time
Alarms
Irregular operating situations highlighted by LED or DISPLAY, with subsequent analysis via GUI.
Asynchronous Motor
Motor in which the rotor and the magnetic field turn at different speeds.
B
Base control board
Section of the main control circuit with interface to other internal or external functions and
slots for optional modules.
Brushless Motor
Motor in which the rotor and the magnetic field rotate at the same speed. The rotor is normally
constituted by magnets according to one or more polar couples. The stator is constituted by a
three-phase winding housed in the slots of a magnetic lamination pack.
C
CANopen
CANopen is a communication protocol used in automation systems. The communication
profiles and the basic specifications of the CANopen devices are provided by the CAN in
Automation (CiA) draft standard 301. The motion control is instead specified in CiA402.
Capacity towards ground
The drives and the power supply have a capacitance to ground (the metal case),
composed mainly by the capacitors on the DC bus circuit in order to have a low
impedance connection for high frequency currents of dispersion.
DC bus
Circuit constituted from the rectified and flattened network voltage.
Braking Circuit
Circuit that turns into heat the excess energy regenerated by the motor during the
deceleration phase.
Short Circuit
Connection into electrical conduction between two phases or conductors with different
polarity of an alternating or continuous voltage.
Clock
Timing signal.
Control loops
Set of hardware and firmware circuits that determine the control of the quantities relating to
torque, speed, position on the basis of the values measured by the relative sensors. They
can be closed or open. The closed control loops are based on sensors for the feedback
signals: resolvers and encoders for position and speed loop, Hall effect current sensors for
the current loop. A typical open control loop is related to the control voltage / frequency (V / f)
of an asynchronous motor without speed transducer.
Convection
Free movement of air (not forced) for cooling.
D
DC bus - Intermediate
circuit
It is the power supply for the individual axis modules formed from the rectified grid voltage and
filtered by powerful capacitors..
Disable
Removes the ENABLE signal.
Deceleration
The rate of decrease of velocity with respect to time
Display
Part of the front panel used for the visual signaling of information.
Directive (Machine)
The Machinery Directive is a set of rules defined by the European Union, which serve to
provide the necessary requirements for health and safety relating to the design and
construction of machinery present on the European market. It applies to fixed, mobile,
transportable and hoisting / moving machinery.
DR2020
MAR2-E-191
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