VVVF TRACTION
Controllers for a traction machine driven by a frequency inverter — VVVF, variable voltage and variable frequency — with vector control, smooth starts and stops, and ±1 cm levelling accuracy whatever the car is carrying.
The frequency inverter switches IGBT transistors to build a three-phase supply that varies in voltage and frequency. With that it regulates motor speed while holding torque constant at low speed too, which is exactly what a two-speed controller cannot do: where there used to be a perceptible step on entering the floor level, there is now a ramp.
Control is vector-based: the regulation loop closes on the current the motor draws, and out of that come smooth starts, speed changes and stops, with ±1 cm levelling accuracy regardless of car load. For the passenger that is less noise and less vibration on every trip; for the building, an elevator that does not announce its own controller.
The consequences are mechanical and electrical at once. It extends the life of motor, gearbox and brake, because the shock of starting and braking disappears; it improves the power factor; and it cuts inrush current from five times to twice rated current, with the energy saving that follows and with less demand on the building's supply — which in refurbishment is often the real limit of the project.
Across the Codelift range the reference inverter is the FUJI Lift-2, from 4 kW (10 A) to 41 kW (91 A), covering everything from a home lift to a bank in a commercial building. On the BP-408 platform, control and inverter talk over DCP on RS-485: the speed reference travels on the bus instead of through on/off contacts, which cuts the wiring between the two units and allows a finer travel profile, with acceleration and braking set by parameter.
The main board is programmed as universal, down-collective or full-collective control, and the group algorithm adapts without an additional controller sitting above it. Inverter rating, machine type, number of floors and rated speed are fixed against the specific installation: the machine's nameplate and the number of floors are enough to close the sizing.
ORIÓN control with FUJI Lift-2 inverter and vector control: smooth starts and stops with ±1 cm levelling accuracy regardless of load.
WHEN THIS ONEA geared traction machine driven by the FUJI Lift-2, inside the ORIÓN serial architecture. The configuration with the most detailed data sheet in the catalogue.
Configuration with frequency inverter and gearbox for traction lifts, with speed regulation and precision levelling.
WHEN THIS ONEThe same speed regulation in the MOVILIFT family, when what is wanted is a closed, pre-wired cabinet with no further configuration depth.
BP-408 assembly with frequency inverter for geared machines, including terminal strip and emergency station.
WHEN THIS ONEAn assembly on a mounting plate with DCP over RS-485 between control and inverter: less wiring between units and a travel profile adjustable by parameter.
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