DRIVES AND FREQUENCY CONVERTERS
DC-EXX control and excitation system for DC machines of excavator motor-generator sets
Country: Japan · Model: DC-EXX
A control and excitation system for motor-generator sets of mining excavators and draglines, developed on more than 50 years of experience. It feeds the fields of DC generators and motors from two 600 V DC buses. It is used when modernizing control systems in the mining industry.
- Application
- control of MG sets (synchronous motor + DC generators) of mining excavators and draglines
- DC converter
- 440 V AC, 3 phases → 600 V DC, 340 A
- Exciters
- IGBT choppers; input 300 or 600 V DC; output 150, 300 and 600 A
- Field protection
- static switches, protective crowbars, absorbing chopper
Technical specifications
| Application | control of MG sets (synchronous motor + DC generators) of mining excavators and draglines |
|---|---|
| DC converter | 440 V AC, 3 phases → 600 V DC, 340 A |
| Exciters | IGBT choppers; input 300 or 600 V DC; output 150, 300 and 600 A |
| Field protection | static switches, protective crowbars, absorbing chopper |
| Control | high-speed PLC, Profibus, operator and maintenance HMI |
| Components | film capacitors, wide temperature range |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
Medium voltage from the mine cable feeds the synchronous motors of the MG sets and an auxiliary transformer, and each synchronous motor turns several DC generators on a common shaft. Diode converters form two common 600 V DC buses, one for the generator fields and one for the motor fields. Individual IGBT exciters in a chopper circuit supply filtered regulated current to the excitation windings, and a high-speed drive controller passes operator commands to the microprocessor exciters. The power factor at the dragline input is maintained by the synchronous motor exciters. Static switches in the excitation circuits protect the fields and perform a controlled emergency stop, and a supervisory PLC controls the excavator and is linked to the operator and maintenance panels.
How to choose
The modules are selected by voltage and current. The DC converter has a 440 V AC input, a 600 V DC output and 340 A, with a soft bus charge circuit and a built-in absorbing chopper. The exciter accepts 300 or 600 V DC at the input and delivers 150, 300 or 600 A, and the voltage is matched to the excitation winding. Commands arrive over Profibus. If the excavator drive is built on thyristor converters, look at the TMdrive-DC / DCe2.
Request a price and lead time
DC-EXX control and excitation system for DC machines of excavator motor-generator sets. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
For which machines is the DC-EXX system intended?
For mining excavators and draglines with motor-generator sets, where several DC generators and motors work in hoist, swing, drag and propel.
What are the parameters of the DC converter in the system?
Input 440 V AC, output 600 V DC, 340 A, with a soft bus charge circuit and a built-in absorbing chopper.
What currents do the exciters deliver?
150, 300 or 600 A at an input of 300 or 600 V DC. Commands arrive from the drive controller over Profibus.
How are the generator and motor fields protected?
By static switches in the excitation circuits, which protect the fields and give a controlled emergency stop, as well as crowbars and an absorbing chopper.
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