Elevator Automatic Voltage Regulator AVR | 60kVA AVR
Automatic Voltage Regulator (AVR) is a critical safeguard for elevator systems, especially in regions with unstable power grids. A 60kVA AVR is typically sized to support high-traffic commercial elevators or groups of smaller lifts, ensuring that sensitive electronics and heavy-duty motors receive a constant, regulated voltage.
Why a 60kVA AVR is Essential for Elevators
Elevator controllers and inverters (VFDs) are highly sensitive to voltage fluctuations. Without regulation, power surges or sags can lead to:
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VFD Faults: Sudden trips (like over-voltage or under-voltage errors) that trap passengers.
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PCB Damage: Expensive control boards can burn out due to “dirty” power.
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Motor Overheating: Inconsistent voltage forces the traction motor to draw more current, shortening its lifespan.
Technical Specifications:
| Specification | Details |
|---|---|
| Current Type | AC |
| Phase | 3 Phase |
| Input Voltage Range | 304 – 456V AC |
| Input Frequency | 50Hz / 60Hz |
| Output Voltage | 380V / 400V / 415V ±3% |
| Output Frequency | 50Hz / 60Hz |
| Efficiency (AC-AC) | >95% |
| Protection (Under Voltage) | 318 ±7V |
| Protection (Over Voltage) | 426 ±7V |
| Protection (Bypass) | Yes (Manual / Auto Optional) |
| Acoustic (Noise Level) | <50 dB |
| Humidity | 20% ~ 90% |
| Operating Temperature | -5°C ~ 45°C |
Key Features for the Elevator Industry
1. High Instantaneous Overload Capacity
Elevators require a high “starting current” when the motor first moves the cabin. A quality 60kVA AVR can handle momentary loads up to 200% or 300% for a few seconds without tripping.
2. Contactless vs. Servo Motor Type
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Servo Motor (Carbon Brush): Common and cost-effective, but requires maintenance (brush replacement) and has a slower response time.
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Static/Contactless (SCR/IGBT): Uses solid-state switching. It is much faster, silent, and maintenance-free—ideal for modern high-speed elevators.
3. Bypass Function
Most industrial AVRs include a manual or automatic Bypass Switch. This allows the elevator to run directly from the mains power if the AVR requires maintenance, ensuring the lift remains operational.
Installation and Maintenance Tips
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Cooling: Ensure the AVR is installed in a well-ventilated machine room. 60kVA units generate heat during the regulation process.
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Phase Monitoring: Modern units feature an LCD screen. Regularly check the display to ensure the input phases are balanced.
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Sizing Logic: For a standard elevator with a 15kW to 22kW motor, a 60kVA AVR provides a healthy safety margin, allowing the unit to run cool and handle peaks comfortably.
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