NKQB24-SR | Damper Actuator | 54 in-lb | Electronic FS | 24V | Modulating | Belimo
Overview
Details for NKQB24-SR
Application
For fail-safe, proportional control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifi cations. The actuator is mounted directly to a damper shaft up to 1.05” in diameter by means of its universal clamp. A crank arm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft. The actuator operates in response to a 2 to 10 VDC or, with the addition of a 500 resistor, a 4 to 20 mA control input from an electronic controller or positioner. A 2 to 10 VDC feedback signal is provided for position indication. Not to be used for a master-slave application.
Operation
The NKQ..24-SR actuator provides 95° of rotation and a visual indicator shows the position of the actuator. When reaching the damper or actuator end position the actuator automatically stops. The gear can be manually disengaged by pressing the black button located on the actuator cover. The NKQ..24-SR actuators use a brushless DC motor, which is controlled by an Application Specifi c Integrated Circuit (ASIC). The ASIC monitors and controls the actuators rotation and provides a digital rotation sensing (DRS) function to prevent damage to the actuator in a stall condition. Power consumption is reduced in a holding mode. The actuator is electronically protected against overload. The anti-rotation strap supplied with the actuator will prevent lateral movement. Add-on auxiliary switches or feedback potentiometers are easily fastened directly onto the actuator body for signaling and switching functions.
Fail-Safe Indication
LED status indicator lights sequence:
Yellow off / Green on: operation ok, no faults
Yellow off / Green blinking: fail-safe mechanism is active
Yellow on / Green off: fault is detected
Yellow off / Green off: not in operation / capacitors charging
Yellow on / Green on: adaption running
Specifications
- Actuator Type
- Electrical fail-safe
- Angle of Rotation
- 95
- Control Type
- DC 2...10 V
- Degree of Protection
- IP54 NEMA 2 UL Enclosure Type 2
- Direction of Rotation (Fail-Safe)
- Reversible with switch
- Electrical Connection
- cable
- Manual Override
- External push button
- Power Consumption (Holding)
- 3 W
- Power Consumption (Running)
- 11 W
- Running Time (Fail-safe)
- <4 s
- Running Time (Motor)
- 4 s / 90B0
- Safety Function
- YES
- Torque
- 54 in-lb [6 Nm]
- Voltage AC/DC
- AC/DC 24 V