SAKO Automatic Voltage Regulator for Elevator

SAKO Automatic Voltage Regulator for Elevator

SAKO is a prominent brand in the power electronics industry, widely used for protecting elevator systems in regions with unstable electrical grids. For elevator applications, SAKO primarily offers two categories of Automatic Voltage Regulators (AVR): the TNS Series (standard passenger lifts) and the SBW Series (heavy-duty industrial/high-capacity lifts).

SAKO TNS Series (15kVA – 60kVA)

The TNS series is the most common choice for standard passenger elevators. It uses Three-Phase Servo Motor technology to provide high-precision voltage stabilization.

• Technology: High-speed servo motor with a carbon brush and copper compensation transformer.

• Precision: Delivers a stable output of 380V/400V ±3%, which is ideal for sensitive VFDs (Variable Frequency Drives).

Key Features for Lifts:

• Phase-Balance System: Automatically balances the three phases, preventing motor overheating due to unbalanced voltage.
• Protection Suite: Includes over-voltage, under-voltage, and over-current protection with automatic trip functions.
• Bypass Switch: Allows the elevator to run on raw mains power during maintenance without disconnecting the wiring.

SAKO SBW Series (50kVA – 2000kVA)

The SBW series is a High-Power Compensated stabilizer designed for heavy-duty freight elevators, large commercial lift groups, or high-rise buildings.

• Technology: Column-type compensation using a robust industrial-grade transformer.

• Capacity: Usually starts at 50kVA, making it the “workhorse” for large installations.

Key Features for Lifts:

• • Extreme Overload Capacity: Can handle the massive inrush current (up to 200% for short periods) required by heavy-duty traction motors.

  • Rugged Durability: Designed for 24/7 continuous operation in harsh machine room environments.

  • No Waveform Distortion: Pure sine wave output ensures the elevator’s digital communication and sensors remain interference-free.

SAKO Technical Parameter Overview

SAKO Automatic Voltage Regulator Selection Guide for Elevators:

Small/Home Lifts (TNS-10kVA to 15kVA)

If you are protecting a villa lift with a small motor (3.7kW – 5.5kW), a SAKO TNS-15kVA is the most cost-effective and reliable choice.

Standard Passenger Lifts (TNS-30kVA to 45kVA)

For a standard 8-to-10-person lift (7.5kW – 11kW motor), a 30kVA or 45kVA TNS unit provides the necessary buffer for peak starting loads.

Freight/Large Groups (SBW-60kVA+)

For cargo lifts or multiple elevators sharing a single power source, the SBW series is required to handle the high amperage and potential for simultaneous motor starts.