Introduction
Mono Power Unit BUM 62 T 11
Baumüller Nürnberg GmbH 5.99009.03
2 INTRODUCTION
The power units designated BUM 62 T are used for the upper power range.
Supply part (converter)
The supply part (mains side) for the generation of the DC link voltage is an uncontrolled diode bridge.
To reduce the peak making current (deburdening during switch-on), the DC link capacitors are charged
via a charge resistor which is bridged by a thyristor after switching-on.
If the typical motor power of the converter on the motor side (see electrical data) is not fully used, e.g.,
because the power of the connected motor is smaller, the performance of the supply current controller
can be used for the connection of other power modules of the BUS 6 series.
The total of all motor powers occurring at the same time must not be higher than the typical motor power.
Starting current load relief
If precautions are not taken, the DC link capacitors produce inadmissibly-large charging current surges
from the mains. In order to avoid these surges, the starting current is limited by a load relief device.
To this purpose, a resistance is integrated into the charging circuit. The resistance limits the charging
current (with the exception of temporary mains failure) and is bypassed once the DC link is charged.
The cycle time for connect the unit in circuit again is ≥3 min.
If using an additional external capacitor at the DC (external capacity ≥ 500 µF) the cycle time is
increased
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