Elevator VFD Selection Guide 2026: How to Choose the Right Drive for Passenger & Freight Lifts

1. Why Elevators Need Specialized VFDs

Unlike standard industrial VFDs, elevator drives must handle unique challenges:

• Safety-critical operation: Passenger safety depends on precise control
• Comfort requirements: Smooth acceleration/deceleration prevents nausea
• High starting torque: 150-200% torque needed for heavy loads
• Regenerative energy: Must handle power flow in both directions
• Emergency functions: 48V rescue power, fire mode, earthquake operation

Using a general-purpose VFD for elevator applications risks passenger discomfort, premature motor failure, and regulatory non-compliance. Specialized elevator VFDs like the AnyHz FST-820 series include S-curve profiling, pre-torque compensation, and EN81-20 compliant safety logic.

2. Types of Elevator VFDs

2.1 Door Drive VFDs (FST-100 Series)

Door drives control the car door and landing door mechanisms. Key requirements:

• Smooth S-curve motion for passenger comfort
• Obstacle detection and anti-pinch protection
• Dual motor support (AC asynchronous + PM synchronous)
• Door width self-learning function

Power range: 200W-750W | Voltage: Single-phase 220V | Recommended: FST-100-0R4S2 (400W) for standard doors

2.2 Standard Elevator VFDs (FST-820 Series)

The main elevator drive controls the traction motor. Features include:

• 4-segment independent S-curve acceleration
• Pre-torque compensation (200% at 0Hz)
• 48V emergency rescue (ARD function)
• Multi-encoder interface (UVW, ABZ, Sin/Cos)

Power range: 3.7kW-30kW | Voltage: 3-phase 380V | Recommended: FST-820-11GT4 (11kW) for 15-person passenger elevator

2.3 Group Control Elevator VFDs (FST-860 Series)

For multi-elevator systems (2-8 cars), group control VFDs provide:

• Intelligent dispatching algorithms
• Traffic pattern learning
• Energy-efficient scheduling
• Centralized monitoring

Power range: 5.5kW-15kW | Recommended: FST-860-15GT4 for 4-elevator group

2.4 High-Speed Elevator VFDs (FST-880 Series)

For skyscraper applications requiring speeds >4m/s:

• Enhanced S-curve algorithms for high-speed comfort
• Advanced vibration suppression
• Precise leveling (±2mm accuracy)

Power range: 11kW-75kW | Recommended: FST-880-22GT4 for 6m/s high-speed elevator

3. Key Selection Criteria

3.1 Motor Type Compatibility

3.2 Voltage & Power Selection

Input voltage must match building supply:

• Single-phase 220V: Home elevators (FST-820-3R7S2, 3.7kW max)
• Three-phase 380V: Standard commercial elevators (3.7kW-30kW)
• Three-phase 690V: Heavy freight elevators (custom)

3.3 Safety Standards Compliance

Elevator VFDs must comply with regional standards:

• EN 81-20/50: European standard for elevator safety
• GB 7588: Chinese national standard
• ASME A17.1: North American standard
• ISO 8100: International standard

AnyHz FST-820 series includes built-in EN 81-20 compliant safety circuits: overspeed protection, door zone detection, forced deceleration, and emergency rescue.

3.4 Encoder Selection

4. Power Calculation & Sizing

4.1 Basic Power Formula

4.2 Quick Selection Table

4.3 Overload Considerations

Elevator VFDs must handle dynamic overload conditions:

• Starting overload: 150-200% for 1-3 seconds
• Emergency stop: 200% braking torque
• Unbalanced load: 100% counterweight mismatch

Always size the VFD with 20-30% power margin above calculated motor power.

5. Application-Specific Selection Guide

5.1 Residential Buildings (Apartments & Villas)

Requirements: Quiet operation, smooth ride, emergency rescue

Recommended configuration:

• Door drive: FST-100-0R4S2 (400W)
• Main drive: FST-820-5R5GT4 (5.5kW) for 8-person, 1.0m/s
• Encoder: ABZ incremental (1024 ppr)
• Options: 48V ARD battery, voice announcer

5.2 Commercial Buildings (Offices & Hotels)

Requirements: High duty cycle, group control, energy efficiency

Recommended configuration:

• Door drive: FST-100-0R4S2
• Main drive: FST-820-15GT4 (15kW) for 21-person, 2.5m/s
• Group control: FST-860-15GT4 for 4-elevator bank
• Encoder: Sin/Cos for high precision

5.3 Hospitals & Medical Facilities

Requirements: Ultra-smooth operation, emergency power, high reliability

Recommended configuration:

• Door drive: FST-100-0R4S2 with extended open time
• Main drive: FST-820-11GT4 (11kW) for bed elevator
• Encoder: SSI absolute (safety-rated)
• Options: UPS backup, fireman's switch, earthquake operation

5.4 Freight & Industrial Elevators

Requirements: High torque, rugged construction, long life

• Door drive: FST-100-0R7S2 (750W) for heavy doors
• Main drive: FST-820-22GT4 (22kW) for 2000kg load
• Encoder: UVW for PM motor (high efficiency)
• Options: Reinforced cabinet, vibration dampers

5.5 High-Speed & Skyscraper Elevators

Requirements: >4m/s speed, advanced vibration control, precise leveling

• Main drive: FST-880-30GT4 (30kW) for 6m/s speed
• Encoder: Sin/Cos 1Vpp (high resolution)
• Options: Active vibration damping, pressure compensation

6. Installation & Commissioning Tips

6.1 Wiring Best Practices

• Separate power and control cables: Minimum 100mm spacing
• Shielded motor cables: Mandatory for runs >50m
• Grounding: Single-point ground to avoid ground loops
• Brake resistor: Install in ventilated area, maintain clearance

6.2 Parameter Setup Sequence

1. Motor parameters: Enter nameplate data (voltage, current, frequency, speed)
2. Encoder setup: Select type (UVW/ABZ/SinCos) and pulses per revolution
3. Mechanical parameters: Gear ratio, sheave diameter, rope ratio
4. S-curve tuning: Set acceleration, deceleration, and jerk rates
5. Pre-torque calibration: Run load weighing self-learning
6. Safety tests: Overspeed, emergency stop, ARD function

6.3 S-Curve Optimization

For optimal ride comfort:

• Acceleration jerk: 0.8-1.2 m/s³ (standard), 0.5-0.8 m/s³ (hospital)
• Deceleration jerk: 1.0-1.5 m/s³
• Leveling speed: 0.1-0.3 m/s
• Door open delay: 2-3 seconds after leveling

7. Common Mistakes to Avoid

8. Elevator VFD Selection Checklist