KEB F5 Elevator Driver Complete Guide

Solution: Increase deceleration time, check the wiring of the braking resistor, and test the braking transistor (see Section 12.1).

E. OL/E.OL2 (overload)

E. OL: Time dependent overload (see section 2.9), 150% trip per minute.

E. OL2: Low speed overload (when the current exceeds 1.4 times the rated value below 3Hz). Excessive current in permanent magnet motors is often caused by incorrect pole position of the encoder or incorrect motor data. Can check if LE06 deviates by more than 2000 counts after learning.

E.OS（Overspeed）

The internal speed limit is 110% of the contracted speed. Trigger reason: Mechanical data (LN) error leading to incorrect speed conversion; Insufficient maximum torque limit (LC30 too low); Encoder A/B is reversed (LE03); The pole position of the permanent magnet motor is incorrect. Need to confirm by comparing DG03 (instruction speed) and DG07 (actual speed).

Serial Command Speed Error / Speed Selection Error

In serial or analog speed control mode, if no valid speed command is received within LT03+20 seconds, it will be triggered. Not effective during maintenance operation. Solution: Check the communication or wiring of the controller to ensure that the speed command is given in a timely manner.

ESD/ETS Input Failure

When the input is configured as Emergency Deceleration (ESD) or Emergency Terminal Deceleration (ETS), if the input is not at a high level during startup, a fault is reported. Ensure that the safety circuit signal is normal.

Preventive maintenance and component replacement cycle

F5 drives are designed to have a long lifespan, but some components may age over time. Based on manual recommendations:

Typical failure phenomena of component standard replacement cycle

The cooling fan operates automatically with temperature control, but it is recommended to overheat (EOH), make noise, and not turn for 10 years

The main circuit electrolytic capacitor has a large voltage ripple and overvoltage/undervoltage false alarm after 10 years (normal environment)

Abnormal parameter storage and EEPROM failure of electrolytic capacitors on the control board after 10 years

Relay inspection results show that the contacts are stuck or unable to engage

Long term storage capacitor activation: If stored for more than 1 year after power failure, the capacitor needs to be aged before powering on. Specific steps are described in section 2.2.11: For drives stored for 1-2 years, power on for 1 hour without modulation; For storage for 2-3 years, an adjustable power supply should be used to slowly increase the voltage (held in stages according to the voltage level). If stored for more than 3 years, double the processing time for each additional year, or consider replacing the capacitor.

Insulation test: According to EN60204-1, a 500VDC megohmmeter is allowed, but all input terminals (L1, L2, L3), DC terminals (++, PA+, PB, -), and output terminals (U, V, W) must be short circuited together, and all 24V control signals must be grounded. Do not use AC voltage to test insulation, otherwise it may damage semiconductors and capacitors.

Advanced features and optimization suggestions

Inertial learning and FFTC: To achieve optimal ride comfort, LL10 inertia learning can be performed under balanced car conditions. The driver will automatically calculate the total inertia of the system (LC41) and activate feedforward torque control (FFTC). After learning, LC02 speed gain optimization can be used to adjust the response from soft to hard.

Pre torque adjustment:

When there is no weighing device, use closed-loop synthesis pre torque (LC01=5). The initial setting is to manually adjust LC10 (recommended 500~2000) and LC11 using closed-loop FOC (LC01=2), and then switch to synthesis mode after the rolling reduction. The drive will remember 90% of the load from the previous cycle as the pre torque for the next cycle.

When there is a weighing device, use closed-loop simulation pre torque (LC01=3) to calibrate the pre torque at no-load and full load through LA15 (gain) and LA17 (offset).

Maintenance operation and unexpected movement: During maintenance operation, the maintenance speed input (function 32) should be kept high, otherwise the driver may falsely report "enable premature removal". Unexpected movement detection is automatically disabled during maintenance operations.

Firmware version compatibility: v3.34 keyboard and control card v4.3 and above are compatible, and can upload parameters of v3.21 and above versions. The old version keyboard cannot download v3.34 configuration.