Charging Circuit; Discharging The Power Modules - ABB ACS580MV Hardware Manual

32 Function and hardware description
Each power module integrates in one single housing a
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6 pulse diode rectifier bridge
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DC circuit
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inverter IGBTs
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gate driver electronics.
The active 3-phase unit is designed as a self-commutated, multi-level voltage source
inverter. As a result of the multi-level topology, the drive produces an optimum number of
switching levels - e.g. 21 level for 6 kV, 33 level for 10 kV, phase to phase.
The resulting waveforms permit the use of standard motors.
1 Output current
2 Output voltage
Output current and voltage waveforms for 10 kV, 50 Hz

Charging circuit

The DC link capacitor is charged via the charging resistor R1 when the MCB is closed and
the drive is connected to the main power supply. Thus, excessive inrush currents are
prevented.
The charging sequence is started by pressing the SUPPLY ON pushbutton on the control
compartment door. After the charging sequence has finished, the charging resistor is
bypassed and the DC link will reach its nominal level. The drive then is in status Stopped.
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.

Discharging the power modules

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. For safety reasons, the cabinet doors are locked for 15 minutes
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1