Belimo NKQX24-MFT Actuator

The Belimo NKQX24-MFT Actuator is a high-speed, electronic fail-safe damper actuator engineered for precise modulating control in commercial HVACR systems. Delivering 54 in-lb of torque, this direct-coupled actuator features Multi-Function Technology (MFT), allowing for a customizable 2-10 VDC control signal or 4-20 mA input via a 500 Ohm resistor. Built with a brushless DC motor and managed by an Application Specific Integrated Circuit (ASIC), the unit provides digital rotation sensing and electronic overload protection to ensure reliable field performance without the need for mechanical limit switches. With a rapid 4-second running time and a configurable fail-safe position (0-100%), this 24VAC/DC HVAC actuator is ideal for applications requiring immediate response and advanced bridging capabilities during brief power interruptions. The NEMA 2 rated housing supports direct mounting on shafts up to 1.05 inches, providing a versatile solution for modulating damper control.

• Fast-Acting Performance: Features a standard 4-second motor runtime and electronic fail-safe return for critical applications.
• Multi-Function Technology: Fully programmable parameters for control signal, running time, and position feedback using Belimo MFT tools.
• Brushless DC Motor: Maintenance-free operation with integrated overload protection across the entire 95-degree rotation range.
• Adjustable Fail-Safe: Capacitor-driven technology allows the technician to set a specific fail-safe position in 10% increments.
• Simplified Installation: Universal shaft clamp and manual override button streamline actuator replacement and commissioning.

How do I configure the NKQX24-MFT for 4-20 mA control?
To utilize a 4-20 mA signal, you must install a 500 Ohm resistor (typically ZG-R01) across the input. The actuator converts the current to a 2-10 VDC internal signal for modulation.

What is the purpose of the bridging time setting?
The bridging time allows the actuator to remain in its last commanded position during short power flickers (up to 5 seconds) to prevent unnecessary cycling and wear on the damper seals.

Does this actuator require an external limit switch?
No. The Belimo NKQX24-MFT is electronically protected from overload. It senses a stall condition at the end of the stroke and automatically stops, protecting the gear train and motor.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.