How does the OTIS OVF20 inverter control elevator movement?
The OVF20 uses a variable voltage and variable frequency (VVVF) system to regulate motor operation.
🔧 How It Works
AC to DC: Incoming 380V or 220V AC power is rectified into DC.
DC to AC: The inverter converts DC into variable-frequency AC to control motor speed.
MCBII Board: Receives speed commands and feedback signals, coordinating inverter operation.
PDB Board: Controls the power transistors under MCBII commands.
PVT Sensor: Provides actual elevator speed feedback for comparison with the set speed.
⚙️ Protection & Braking
The system monitors output current and activates protection when current exceeds the set limit. A braking resistor is also used during operation.
💡 Key Takeaway
The OVF20 combines power conversion, speed feedback, and current protection to control elevator movement.
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