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Parallel connected supply units
It possible connect two supply units parallel to
the same bus get higher pow redundancy. This possibility concerns parallel
connection two diode supply units (DSU+DSU), two
IG supply units (ISU+ISU), DSU and ISU to
the same bus. 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.
This configuration reduces harmonics the supply
network.
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. The converter can operate both
m otoring and generating odes.2009 Product series. The control
also provides near unity power factor.
Redundancy needed critical processes and also
w hen aintenance intervals are long. hen line voltage low.
Using DSU+ISU connected parallel solution for
w hen the need for braking pow uch lower than
for motoring power.2.
Standard braking resistors are separately available in
their own cabinets.
These two units will located the rear ends of
the drive bus. The voltage
constant and the line current sinusoidal.
AC800M control unit (optional)
The multidrive concept also includes the control
unit for the AC800M and S800 I/O.IGBT supply unit (ISU)
An IGBT supply unit used regenerative drive
systems convert three-phase voltage DC
voltage. The unit can
also boost voltage e.g. ISU dimensioned for braking
pow and operates continuously, while DSU is
dimensioned for otor power minus ISU power. The converter hardware compatible
with drive units.
The main circuit consists main switch, filter
and converter.
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.
A fully regenerative supply unit with power
factor requires pow compensation.
3AFE68248531 REV 20. The thyristor supply unit contains two 6-pulse
thyristor bridges antiparallel connection. has the
ability regenerate back the mains, providing
considerable energy savings with applications
having excessive braking powers. The control unit
is equipped with communication interfaces, power
supplies and the front-devices necessary for the
automation equipment. 12-pulse bridge
configuration can implemented with two thyristor
supply units supplied three-winding transformer.
Thyristor supply unit (TSU)
A thyristor supply unit used regenerative drive
systems convert three-phase voltage DC
voltage. pow control gives the sam firm but
gentle perform ance DTC gives otor control. The control
perform ance excellent due the ultra-fast control
technology, the same DTC.
Harmonic content remains extremely low due DTC
control and LCL filtering
