KEB COMBIVERT F5 elevator dedicated frequency converter

The official reference manual for KEB COMBIVERT F5 elevator specific frequency converter is aimed at 230V/480V, 0.2~250hp models, focusing on elevator safety control. It clarifies the strong safety regulations that require a 5-minute power outage and voltage drop to a safe value before operation. The system explains installation wiring, STO safe torque shutdown, multi type encoder adaptation, LCD panel operation, startup debugging, motor/encoder/inertia self-learning, speed curve, pre torque anti slip, and fault diagnosis throughout the entire process. It supports induction motor/permanent magnet synchronous motor, V/F/vector/FOC closed-loop control, built-in overcurrent, overvoltage, overload, brake transistor monitoring and other elevator specific protections, meeting EN81, UL508C, IEC61800 elevator safety standards. It is an elevator debugging tool. The core basis for maintenance.

Safety regulations (mandatory)

Operational Security

After power failure, wait for ≥ 5 minutes to confirm that the DC bus is not powered before operation

Only professional electrical personnel are responsible for installation, debugging, and maintenance

It is strictly prohibited to connect capacitors/surge absorbers on the output side

safety function

STO safety torque shutdown: compliant with IEC61800-5-2, SIL3/PLE

Brake transistor monitoring: K1/K2 normally closed contacts, power cut off due to fault

Motor overheat protection: supports PTC/KTY84 temperature sensor

Technical specifications

Key parameters of the project

Voltage level 230V (180~260V), 480V (305~528V)

Power range 230V: 7.5~100hp; 480V：7.5~250hp

Output frequency 0~599Hz, carrier frequency 1~16kHz

Overload capacity 150%/1min, low-speed current limiting protection

Safety certification EN81, UL508C, IEC61800, EN61000

Environmental temperature operation * * -10~45 ℃, storage -25~70 ℃**

Installation and wiring

Mechanical Installation

Vertical installation, with a distance of ≥ 10cm between the top and bottom, and ≥ 5cm between the left and right sides**

If the altitude is greater than 1000m, the capacity needs to be reduced by 1% every 100m**

Main circuit wiring

Power supply: L1/L2/L3; Motor: U/V/W (reverse connection strictly prohibited)

Braking: PA/PB connected to braking resistor, following the minimum resistance value

Grounding: 480V ＜ 10 Ω, 230V ＜ 100 Ω, high-frequency shielding grounding

Encoder wiring

Support: TTL, EnDat, Sin/Cos, SSI, Hiperface, UVW

Cable: Shielded twisted pair, kept away from power lines * * ≥ 20cm**

Power supply: 5V/15V/24V optional, maximum load 300mA

Operation panel and permissions

LCD operation

Shortcut keys: F1 (recent), F2 (diagnostic), F3 (parameters), F4 (language)

Display: speed, current, bus voltage, fault information

Password permission

Basic (11): Read only

User (27): Basic Parameters

Adjuster (119): Advanced Debugging

OEM (479): All parameters

KEB: Manufacturer Permissions

Startup debugging process (core)

Basic Settings (US Group)

US02: Units (Imperial/Metric)

US03: Motor type (induction/PM)

US04: Control type (digital/binary/analog/serial)

US06: Rated speed

Motor parameters (LM group)

Input according to the motor nameplate: power, speed, current, voltage, frequency

PM motor requires additional input torque and automatically calculates the number of poles

Encoder parameters (LE group)

LE02: Pulse Count (PPR)

LE03: AB phase commutation

LE06: Magnetic pole position (PM motor)

Mechanical parameters (LN group)

The diameter of the pulley, reduction ratio, and winding ratio determine the conversion of elevator speed

Self learning (LL group)

LL01: Self learning of motor parameters

LL05: SPI Static Magnetic Pole Learning (PM Motor, No Displacement)

LL06: Encoder pole learning (requires slight displacement)

LL10: System Inertia Learning (Optimizing Comfort)

Core control function

Control mode (LC01)

0: V/F open-loop

1: Vector open-loop

2: FOC closed-loop+internal pre torque

3: Analog pre torque (connected to weighing)

4: Digital pre torque

5: Predictive synthesis pre torque (optimal for anti slip vehicle)

Speed curve (LS group)

Leveling speed, maintenance speed, high speed, acceleration and deceleration, Jerk curve

Support preset curves in three levels: soft, medium, and hard

Pre torque (anti slip vehicle)

Establish torque before opening the brake to eliminate starting the rolling car

No need for weighing sensors, adaptive load

Protection and malfunction

Complete protection

Overcurrent (E.OC), Overvoltage (E.OV), Overload (E.OL)

Overheating, undervoltage, phase loss, grounding fault

Encoder malfunction, brake transistor malfunction, brake feedback malfunction

Fault handling

Fault records with timestamp, supporting data recording

Reset: Panel F4 reset, some faults need to be confirmed by LE01

Key questions and answers

Question 1: What are the two learning requirements for PM permanent magnet synchronous motors? What are the consequences of failure?

The answer must be completed:

Motor parameter self-learning (LL01): Obtaining motor resistance and inductance

Magnetic pole position learning (LL05 SPI or LL06): determining encoder and rotor phase

Consequences of Failure:

Motor shaking, abnormal noise, and runaway

Excessive output current triggers overcurrent protection

The elevator slides and experiences significant vibrations during operation, making it unable to function properly

Question 2: How does the F5 frequency converter achieve elevator startup without slipping? What are the core settings?

Answer core solution: Closed loop FOC+predictive pre torque (LC01=5) Key settings:

LC01=5 (synthetic pre torque)

Complete Inertia Learning (LL10)

Adjust the brake timing (LT01~LT03)

Optimize pre torque gain (LC05/LC10)

Principle: The driver automatically calculates the load torque and outputs the corresponding torque before opening the brake, completely eliminating rolling.

Question 3: What are the three most common causes and troubleshooting steps for E.OC overcurrent faults?

Common reasons for answers:

Motor wire reverse/short circuit/grounding

Motor parameter error or incomplete self-learning

Acceleration too fast, encoder abnormal, brake not open

Troubleshooting steps:

Check the U/V/W wiring and confirm that there is no short circuit or grounding

Check the motor nameplate parameters and re execute LL01 motor learning

Extend acceleration time (LS20), check encoder signal and brake feedback