Arkel KM-20 DC Door Control Board for 24V Automatic Elevator Doors

The Arkel KM-20 DC Door Control Board is an advanced intelligent controller developed for 24V DC telescopic elevator door systems. Designed for modern automatic lift doors, the KM-20 combines high-resolution encoder technology, intelligent motion algorithms, and 4-region motor control to deliver smooth, reliable, and highly precise door operation.

Unlike traditional elevator door controllers that rely on mechanical limit switches, the Arkel KM-20 uses encoder-based position monitoring to automatically detect door travel limits. This significantly reduces maintenance requirements while improving positioning accuracy, passenger comfort, and long-term operational reliability.

Key Features of Arkel KM-20 Door Controller

• 24V DC geared motor support up to 200W motor power
• 4-region intelligent motor control for smooth acceleration and deceleration
• S-curve motion algorithm for quiet and comfortable door travel
• Encoder-based operation without mechanical limit switches
• Automatic door width learning during setup
• Integrated obstruction detection and anti-pinch safety protection
• Nudging mode support with buzzer warning
• Compatible with fire lift applications
• Battery backup operation for emergency evacuation scenarios
• Built-in 2-digit 7-segment display and keypad
• Optional KM-20 external keypad support for advanced configuration

Technical Specifications

Advanced Encoder-Based Door Control

The KM-20 uses a high-resolution dual-channel encoder system to continuously monitor door position and movement speed. This eliminates the need for conventional open-close limit switches and enables highly accurate motion control.

Its intelligent software automatically learns the door travel distance during setup, simplifying installation and improving long-term reliability. The integrated S-curve acceleration and deceleration technology minimizes vibration, noise, and mechanical stress on door components.

Enhanced Passenger Safety

Passenger safety is one of the most important advantages of the Arkel KM-20 DC. The controller continuously monitors motor load and photocell inputs to detect obstructions or excessive closing force.

If an object or passenger blocks the door during closing, the system instantly triggers re-opening to prevent squeezing or injury. The controller also supports Nudging Mode, which slowly closes the doors with audible warning when the photocell beam remains interrupted for an extended period.

Emergency Battery Operation

In the event of a mains power failure, the KM-20 can operate using 2x 12V backup batteries or an external 24V DC emergency supply. This allows the elevator doors to open automatically during emergency evacuation procedures and helps prevent passenger entrapment.

The integrated smart battery management system includes over-discharge protection and sleep mode functionality to protect battery lifespan.

Flexible Integration with Elevator Controllers

The Arkel KM-20 is designed for seamless integration with elevator mainboards and lift control systems. It provides relay outputs for:

• Door fully open signal
• Door fully closed signal
• Obstruction / photocell detection
• Open and close commands
• Slow speed and high-speed signals

Its compatibility with fire lift applications and advanced programmable parameters make it suitable for both modernization projects and new elevator installations.