Baumuller BUG 2, Technical Description And Operations Manual

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Technical Data General
6
BUG 3/2/20 Basic Feed Unit
5.96064.02
Baumüller Nürnberg GmbH
2.1.1 Description of Function
Intermediate Circuit
The intermediate circuit, which supplies the connected servo units, is fed from the mains via an exter-
nal matching transformer and the uncontrolled bridge rectifier.
Starting Current Limitation Device
If no measures were taken, the intermediate circuit capacitors would lead to inadmissibly high charg-
ing current surges when you switch on the mains current. Mains transformers of up to 5 kVA automati-
cally reduce the charging current surge to a non-dangerous level. In the case of large transformers,
you must install a starting current limitation device on the input side.
This device is shunted out after the start-up stage.
Power Supply
The internal switching power supply generates the supply voltages for the connected servo units from
the intermediate circuit or from an external auxiliary voltage.
In addition, permanent monitoring is carried out of the temperature, the intermediate circuit voltage,
the supply voltages and the ballast function. In the case of inadmissible values, the system issues a
message that is further-processed appropriately.
The system indicates these messages to you directly by means of LEDs.
Ballast
When the drive is operating in regenerative mode, it feeds back to the intermediate circuit and raises
its voltage. If this voltage exceeds an impermissibly high value, the integrated ballast transistor
switches the ballast resistor (which can be external if desired) to the intermediate circuit and removes
the excess energy.