AC analog units

Rapid replacement if needed

The BAUMOTRONIC converter system is of modular structure and comprises the following units:

  • the BUG basic feed unit
  • the BUS servo power unit

The BUG 2/3/20 named basis feed units are mains-side power converters for feeding the BUS 3/21/20 drive amplifiers. They have a ballast circuit to dissipate the drive's breaking energy. They are available with internal ballast resistor or, as E version with a connector for external resistors.

Intermediate Circuit
The intermediate circuit, which supplies the connected servo units, is fed from the mains via an external 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 charging current surges when you switch on the mains current. Mains transformers of up to 5 kVA automatically 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

AC units analog

Features

Basic feed unit BUG

  • basic unit BUG 3–10.5kW
  • basic unit BUG 2–18kW
  • basic unit BUG 20–36kW
  • Connection using a pre-transformer of 400 V/230 V 3∼
  • Servo power units' current supplied from the intermediate circuit
  • Switching power supply with wide voltage range continues to be ready-for-use while the intermediate circuit is charged
  • Ballast circuit with high peak power integrated in the basic feed unit

Servo power unit BUS

  • BUS 3 for motors with nominal current up to 15A
  • BUS 21 for motors with nominal current up to 30A
  • BUS 20 for motors with nominal current up to 160A
  • Servo power units are attachable to the basic unit
  • kurz- und erdschlussfest
  • customer and drive-specific optimisations, saved together in exchangable operation data memory