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IGBT supply unit (ISU)
An IGBT supply unit used regenerative drive
systems convert three-phase voltage DC
voltage. The thyristor supply unit contains two 6-pulse
thyristor bridges antiparallel connection.
A fully regenerative supply unit with power
factor requires pow compensation.
These two units will located the rear ends of
the drive bus. 12-pulse bridge
configuration can implemented with two thyristor
supply units supplied three-winding transformer.g. The converter can operate both
m otoring and generating odes.
AC800M control unit (optional)
The multidrive concept also includes the control
unit for the AC800M and S800 I/O. The converter hardware compatible
with drive units.
Using DSU+ISU connected parallel solution for
w hen the need for braking pow uch lower than
for motoring power. The voltage
constant and the line current sinusoidal.
Brake unit
In resistor braking henever the voltage the
intermediate circuit frequency converter exceeds a
certain limit, braking chopper connects the circuit to
a braking resistor.
Thyristor supply unit (TSU)
A thyristor supply unit used regenerative drive
systems convert three-phase voltage DC
voltage. Non-standard resistors can used
providing that the specified resistance value not
decreased and that the heat dissipation capacity the
resistor sufficient for the drive application. The control unit
is equipped with communication interfaces, power
supplies and the front-devices necessary for the
automation equipment.2.2009 Product series. The control
perform ance excellent due the ultra-fast control
technology, the same DTC. The unit can
also boost voltage e. pow control gives the sam firm but
gentle perform ance DTC gives otor control. ISU dimensioned for braking
pow and operates continuously, while DSU is
dimensioned for otor power minus ISU power.
Higher power needed, for exam ple, high power
applications here gives ore drive flexibility to
connect drive units the sam bus, for high
overload requirements. has the
ability regenerate back the mains, providing
considerable energy savings with applications
having excessive braking powers.
Harmonic content remains extremely low due DTC
control and LCL filtering.
3AFE68248531 REV 20.
Standard braking resistors are separately available in
their own cabinets. This possibility concerns parallel
connection two diode supply units (DSU+DSU), two
IG supply units (ISU+ISU), DSU and ISU to
the same bus.
The main circuit consists main switch, filter
and converter. hen line voltage low.
This configuration reduces harmonics the supply
network.
Redundancy needed critical processes and also
w hen aintenance intervals are long.
Parallel connected supply units
It possible connect two supply units parallel to
the same bus get higher pow redundancy. The control
also provides near unity power factor
