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ABB DSMB-02C 3AFE64666606 inverter power unit

From: | Author:Wang | Time :2024-12-03 | 170 visit: | Share:

ABB DSMB-02C 3AFE64666606 inverter power unit

Independent of the power supply scheme, the drive
provides an internal back-up supply for 100 ms.
This safety feature enables the control system to
shut down the drive in a controlled manner if the
auxiliary power fails.
Optionally the drive can be equipped with an addi tional battery. The battery supports 15 minutes
ride-through operation of the control system.
—
The power feed for the auxiliary
supply must be protected with a
suitable circuit protection rated
for the inrush current. For infor mation, see utility consumption
list of the drive.
For information on the configuration of
the auxiliary power interface in the drive,

see the wiring diagrams.
This section describes the main design features and introduces the

major power electronics components of a typical ACS2000.
1. Transformer
2. COU - control unit
3. TEU - terminal unit for line and motor cables
(behind a bolted partition)
4. EMC filter or sine filter
(depends on motor application)
5. Fan unit
6. INU - inverter unit
7. DC link
8. DFE - diode front end
CMC - common mode choke
(only present if external transformer is used)


2.3.1 DFE - Diode front end

The diode front end of the drive consists of two
identical phase modules. Each phase module
houses a 12-pulse diode rectifier bridge which add
up to a network friendly 24-pulse system. The DFE
rectifies the AC line voltage of the supply network
and connects its output to the minus, and plus side
of the DC link. The DFE allows two-quadrant operation of the drive.
2.3.2 DC link
The DC link consists of the DC capacitor, the
charging unit and the grounding switch.
DC link capacitor
The numbers of capacitors (1) present depend on
the power rating of the drive.
Charging unit
Charging
The unit charges the DC link capacitor and the
phase capacitors before the MCB is closed and the
drive is connected to the main power supply. Thus,
excessive inrush currents are prevented.
The charging unit is fed from the auxiliary power
supply and charges the DC link and the phase
capacitors to 90% of the steady state voltages.
The charging sequence is started by pressing the

SUPPLY ON push-button on the control compartment door. After the
charging sequence has finished, the charging unit is disconnected from the

medium voltage circuit, the MCB is closed and the
DC link reaches its nominal level.
Stand-by mode
When the DC link has been charged, it is possible to
keep the drive in this state to facilitate a more
rapid start-up procedure. The losses during standby mode are approx. 1% of the nominal power and
are caused from small losses in the INU and the
auxiliaries.
Discharging
Discharging is initiated by pressing the SUPPLY
OFF pushbutton on the control compartment door.
The energy stored in the DC link is dissipated in the
resistors of the power part of the drive. When the
DC link voltage has decreased below a quarter of
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