The unit
can also boost motor voltage when line voltage low. The control also provides near
unity power factor. the active mode the IGBTs are con
trolled keep the voltage constant and the line
current sinusoidal.
Standard braking resistors are separately available in
their own cabinets.
■
IGBT Supply Unit (ISU)
An IGBT Supply Unit used regenerative drive
systems convert three-phase voltage DC
voltage.
The main circuit consists main switch, filter and
a converter. 12-pulse bridge
configuration can implemented with two thyristor
supply units supplied three-winding transformer.3.
This configuration reduces harmonics the supply
network.
A fully regenerative IGBT Supply Unit with power
factor requires power compensation.
Harmonic content remains extremely low due DTC
control and LCL filtering. The control unit is
equipped with communication interfaces, power
supplies and the front-devices necessary for the
automation equipment.
AC800M Control Unit (Optional)
The Multidrive concept also includes the control unit
for the AC800M and S800 I/O. power control gives the same firm but
gentle performance DTC gives motor control.2004. The Thyristor Supply Unit contains two
6-pulse thyristor bridges antiparallel connection.. It
has the ability regenerate back the mains, provid
ing considerable energy savings with applications
having excessive braking powers. The control performance excel
lent due the ultra-fast control technology, the same
as DTC. The converter hardware compatible with
drive units. 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.
Dynamic Braking Unit (DBU)
In resistor braking whenever the voltage the inter
mediate 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. the passive mode the converter operates
as the rectifier.
3AFE 68248531 REV 31
