06/056
2 Technical data
The technical data of the brief instructions and the operating instructions refer to the
reference point of the frequency inverter. The reference point of the frequency in-
verter is defined at the admissible mains voltage and a switchin
g frequency of 2 kHz.
This reference point is to be checked according to the requirements and redefined for
the operating points of the application if need be.
2.1 Requirements
The functionality in the software configurations 160, 260 and 460 described in this
application manual requires a distinct selection of the frequency inverters to be used.
The criteria for the design of the frequency inverter relevant for the applications are
listed below.
Overload reserve
In these applications, in particular with high-quality hoist application, there is the re-
quirement that the frequency inverter provides an increased overload reserve. The
reference points of the frequency inverters and the matchin
g overload for 60 seconds
are described in the matching brief instructions and operating instructions.
Holding moment
The change between the raising and lower operating points is to be done without the
holding brake, with a low speed of lowering being demanded for the positioning. In
addition, an increased holding moment is necessary in order to vent (open) and close
the brake free of wear and tear. In the design of the drive system, the available refer-
ence current of the frequency inverter at a standstill (rotary frequency zero) is to be
taken into account.
Brake transistor
The generator operating point (braking operation) occurring in the applications in
which energy flows back into the frequency inverter leads to a rise in the DC link volt-
age. In order to limit the direct voltage, the frequency inverter adds an external brake
resistor via the brake chopper transistor from a certain ad
justable threshold value.
The latter converts the excess energy into heat. The brake chopper transistor in the
frequency inverter and the external resistor are to be dimensioned according to the
braking energy to be expected.
Absolute figure or incremental speed sensor
The software configurations described in the application manual differ in the controller
structure and the resultant operational behavior. According to the requirements, sen-
sor-less control (configuration 110), sensor-less field-oriented control (confi
guration
410) or field-oriented control with speed sensor (configuration 210) is to be selected.
Thanks to the modular hardware and software, the frequency inverters enable con-
nection of the customary absolute figure or incremental speed sensors.
Warning! This information cannot take every imaginable case of erection, operation
or maintenance into account. If you require further information or if spe-
cific requirements not treated extensively enough in the application man-
ual exist, you can request the necessary information from the local repre-
sentation of the firm of VECTRON Elektronik.
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