A-26
Application Manual CDA3000
Appendix C Glossary
Driving set Characterized by a fixed frequency and associated
acceleration and deceleration ramps. A driving set
is not the same as a positioning set, which also
includes a value for a position.
Dynamic speed
accuracy
Speed deviation during the startup or braking proc-
ess of a speed change. The greatest deviation very
often occurs in the transient response in settling to
the desired speed.
EMC Electromagnetic Compatibility; limit values laid
down in directive aimed at reducing the interference
emitted by devices and preserving the operating
safety of devices subject to interference.
ENPO ENable POwer; non-software-dependent hardware
enable for the inverter power stage.
Exponent (Latin: exponere = expose)
Power of a mathematical expression positioned to
the top right of it (base). The exponent indicates
how often the base is to be multiplied by itself.
Fast reference
coupling
In Master/-Slave operation the slave drive is control-
led by the master speed-synchronously by way of a
digital reference transfer. The transmission ratio can
be determined by way of a coupling factor.
Field range, Field
weakening range
Speed range above the rated speed of a three-
phase a.c. motor in which the stator voltage remains
constant and only the frequency is changed.
FIXPT16 16-bit raw value divided by 20, to get decimal places
resolution in 0.05 increments
FLOAT32 32-bit number format with floating point. No fixed
number of places (bits) is reserved for the post-dec-
imal places.
FOR F
ield Oriented Regulation, control method in which
the rotor speed and current angle of the rotor are
ascertained with an encoder. The voltage pointers
are placed dependent on the calculated information
to form the torque from the current. Very high
dynamics and smooth running, also safeguarded
against stalling.
Freewheeling
diode
Diode to protect electronic components under
inductive loads. Inductors (such as relay coils) pro-
duce high induced voltages at the moment of shut-
down which attempt to maintain the current flow in
the circuit and result in the destruction of compo-
nents.
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