ALSTOM ALSPA series frequency converter

Programming standard: IEC 61131-3, core language is Function Block Diagram (FBD), also supports ladder diagrams, structured text, etc. This significantly reduces the programming barrier between PLC and transmission.

Control structure: Built on a universal functional block library, the same algorithm library can be used for low and medium voltage drives.

Programming tools: A unified engineering software environment that eliminates the need to switch tools between different product lines.

Human Machine Interface: A universal HMI system, including Drive Data Manager ™ Keyboard, PC visualization software, or central programming console.

Communication interface: Supports all mainstream fieldbuses, including WorldFIP, Profibus, Interbus, Ethernet, etc.

3.2 Flexible Expansion and Diagnostic Capability

PEC controllers offer optional enhancement features:

Enhanced processors (Pentium class or DSP) are used for complex control algorithms such as model predictive control or high-speed signal processing.

Scalable user I/O points.

Fieldbus option module.

In terms of diagnosis, due to the complete integration of the entire controller family, the diagnostic function has been significantly enhanced:

History: Extremely powerful and flexible event recording, supporting post fault analysis. The data can be exported to a common file format (such as CSV) for third-party tools (such as MATLAB, Excel) to analyze.

Status monitoring: Comprehensive alarm, trip, and user-defined event monitoring.

Remote diagnosis/remote maintenance: supports remote access through modems or Ethernet, reducing on-site service time.

Diagnostic data can be viewed or extracted using any of the following tools:

Drive Data Manager ™ Keyboard (handheld terminal)

PC based visualization software package

Central programming console for large-scale systems

Key points for selection and configuration of low-voltage AC transmission

Although the document does not list specific low-voltage series models (such as the previous ALSPA MV3000, VD4000, etc.), typical characteristics of low-voltage transmission can be extracted from the technical description:

4.1 Power coverage and voltage level

Low voltage transmission covers 0.25kVA to 5MVA. For loads exceeding 500kW, multi module parallel connection or high output current design is usually adopted. The input voltage is generally 380-480V or 690V, 50/60Hz.

4.2 Control mode

Low voltage transmission support based on PEC platform:

V/f control (for multi motor parallel connection or fan pump type)

Speed sensorless vector control (for high dynamic response)

Closed loop vector control with encoder (for positioning and constant torque load)

4.3 Typical Applications

The applications listed in the document include: cement mills, crushers, compressors, conveyors, cranes, extruders, mixers, fans, pumps, machine tools, marine propulsion, metal rolling mills, mine hoists, paper machines, presses, process production lines, dynamometers, test benches, wind tunnels, and wind turbines.

For system integrators, ALSTOM also offers low-voltage drive modules, inverters, and rectifiers (up to 3.6MW) for easy integration into custom cabinets.

Medium voltage AC transmission: direct output without transformer

Medium voltage transmission is a major highlight of the ALSPA series. Traditional medium voltage frequency converters often require input transformers and output boost transformers, while some medium voltage solutions from ALSTOM can directly output up to 10kV voltage without the need for output transformers, significantly reducing system losses and footprint.

5.1 Technical Topology

Medium voltage transmission usually adopts unit series multilevel (such as perfect harmonic free) or neutral point clamped three-level topology. ALSTOM has extensive engineering experience in this field, particularly in the control of synchronous motors and wound rotor motors.

5.2 Performance advantages

High input power factor, no need for separate reactive power compensation device.

Output sine wave voltage without additional stress on motor insulation, allowing the use of ordinary medium voltage motors.

It can achieve energy feedback (four quadrant operation) and is used for loading mine hoists or centrifuges.

5.3 Selection considerations

When choosing medium voltage transmission, users should pay special attention to:

Motor type: induction motor, synchronous motor, or wound rotor motor. Synchronous motors require excitation control units, and ALSTOM provides complete excitation system integration.

Overload capacity: usually 110% continuous, 150% per minute.

Environmental conditions: The medium voltage transmission cabinet is usually IP42 or IP54, and heat dissipation (water cooling or forced air cooling) needs to be considered.

DC drive and special power supply

Although AC transmission has become mainstream, DC transmission still holds an irreplaceable position in some high overload, large inertia loads, or old renovation projects.

6.1 DC drive specifications

ALSPA DC transmission covers 7.5kW to 25MW, with standard products below 750kW and engineering customization above. Adopting 6-pulse, 12 pulse, or 24 pulse rectification, with optional harmonic filters. Suitable for: