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Variable Frequency Drive Unit
Industrial IP54 VFD units for precise speed control of feeder belt, collection conveyor, mixer, and pump motors in the AVL-WMM plant.
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At a glance
| Control method | V/f and sensorless vector (switchable) |
|---|---|
| Input voltage | 380–415 V AC, 3-phase, 50/60 Hz (±10%) |
| Output frequency range | 0–400 Hz (typically operated 5–60 Hz in WMM service) |
| Power range available | 2.2, 4, 5.5, 7.5, 11, 15, 22, 30, 37 kW |
| Overload rating | 150% of rated current for 60 seconds |
| Enclosure rating | IP54 standard / IP55 washdown option |
| EMC filter | Built-in Class C2 |
| Communication | Modbus RTU RS485 standard; PROFIBUS / CANopen optional |
Overview
Variable frequency drive (VFD) units are used throughout the AVL-WMM plant to control the speed of AC induction motors on the aggregate feeder belts, collection conveyor, water pump, and in some configurations the mixer shafts. By varying the output frequency and voltage supplied to the motor — typically from 5 to 60 Hz — the VFD allows the plant PLC to set the precise belt speed, pump flow, or conveyor rate required for the active mix design and to adjust these in real time as production rate changes.
Each VFD in an AVL-WMM plant is an IP54-rated industrial unit mounted in a ventilated control cabinet. The drives are sized to match the motor rating at each position: from 2.2 kW on small feeder belts to 37 kW or above on mixer and main conveyor drives. Avelta supplies replacement drives to the OEM-equivalent specification for each motor position, pre-programmed with motor parameters where the customer's original configuration data is available.
Function
VFD control is the mechanism by which the plant PLC delivers the proportioning accuracy required by the WMM mix design. On the feeder belts, even a 1% speed error from a faulty drive translates directly into an aggregate grading deviation in the output mix. On the water pump, the VFD controls delivery pressure within the closed-loop moisture control loop. VFD failure from overheating, insulation breakdown, transient over-voltage, or DC-bus capacitor ageing causes an immediate drive fault and belt or pump stop — halting production until a replacement is fitted. Keeping one spare drive per power rating on site is standard practice for continuous-production WMM plants.
Construction & quality
Industrial IGBT-based PWM inverter. Power section: 6-pulse diode rectifier bridge, film-capacitor DC bus, IGBT output stage. Control board: 32-bit DSP with V/f and sensorless closed-loop vector control modes. Enclosure: IP54 powder-coated steel, DIN-rail or panel-mount versions available. Cooling: integral heat sink with speed-regulated fan. EMC filter: built-in Class C2 (standard). Protection functions: over-voltage, under-voltage, over-current, over-temperature, short-circuit, ground fault, motor phase loss. Communications: Modbus RTU RS485 standard; PROFIBUS or CANopen on request.
When to replace
- Recurring over-temperature fault despite clean cabinet air filters and adequate ventilation
- Drive output frequency drifting at a fixed set-point, indicating a control board or encoder fault
- DC bus capacitors showing bulging or electrolyte odour on annual visual inspection
- IGBT fault code appearing on the display, indicating an output stage failure
- Drive trip not clearing after reset with no motor-side fault identified, indicating an internal board failure
Compatibility & fitment
Available in 2.2 to 37 kW ratings to cover all motor positions in AVL-WMM plants from 100 to 400 TPH; Avelta identifies the required power rating, voltage class, and communication protocol from the plant's electrical motor schedule.
Why buy from Avelta
Avelta VFDs are supplied pre-programmed with motor-specific parameters derived from the plant's original commissioning data where available, reducing site setup to a parameter verification check rather than a full motor auto-tune sequence.
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