800-543-9038
USA
866-805-7089
CANADA
203-791-8396
LATIN AMERICA
165
M40024 - 05/10 - Subject to change.
© Belimo
Aircontrols (USA),
Inc.
NKQX24-MFT
Proportional Control, Fail-Safe, Operation, Direct Coupled, 24V, Multi-Function Technology
®
Technical Data
NKQX24-MFT
Power supply
24VAC ±20% 50/60Hz
24VDC ±10%
Power consumption
11W (3W)
Transformer sizing
22VA (class 2 power source)
Electrical connection
18 GA plenum rated cable
½" conduit connector
protected NEMA 2 (IP54)
3 ft [1m] 10 ft [3m] 16 ft [5m]
Overload protection
electronic throughout 0 to 95 rotation
Operation range Y
2 to 10 VDC, 4 to 20mA (default), variable VDC
Input impedance
100k
Ω
(0.1 mA), 500
Ω
Feedback output U
2 to 10VDC, 0.5mA max, VDC variable
Angle of rotation
max. 95°, adjustable with mechanical stop
electronically variable
Torque
54 in-lb [6 Nm]
Direction of rotation
reversible with
switch
Fail-safe position
adjustable with dial or tool 0 to 100% in 10%
increments
Position indication
refl ective visual indicator (snap-on)
Manual override
external push button
Running Time
normal operation
fail-safe
4 seconds (default), variable 4 to 16 seconds
4 seconds
Humidity
5 to 95% RH non-condensing (EN 60730-1)
Ambient temperature
-22°F to +122°F [-30°C to +50°C]
Storage temperature
-40°F to +176°F [-40°C to +80°C]
Housing
NEMA2, IP54, UL enclosure type 2
Housing material
UL94-5VA
Agency list
cULus acc. to UL 60730-1A/-2-14
CAN/CSA E60730-1:02
CE acc. to 2004/108/EEC and 2006/95/EC
Noise level
60dB(A)
Servicing
maintenance free
Quality standard
ISO 9001
Weight
2.40 lbs [1.1 kg]
Torque min. 54 in-lb for control damper surfaces up to 12 sq ft.
Application
For proportional modulation of dampers in HVAC systems.
The NKQX24-MFT provides electrical power off operation for reliable fail-safe
application.
The actuator is mounted directly to a damper shaft up to 1.05“ in diameter by a
universal clamp. A crank arm and several mounting brackets are available for
applications where actuator cannot be direct coupled to the damper shaft.
The default parameters for 2 to 10 VDC applications of the NKQX24-MFT
actuator are assigned during manufacturing. If necessary, custom versions
of the actuator can be ordered. The parameters can be changed by: pre set
or custom confi gurations provided by Belimo or on-site using the PC-Tool
software.
Operation
The actuator is electronically protected against overload. The anti-rotation
strap supplied with the actuator will prevent lateral movement.
The NKQX24-MFT 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 button located on the actuator cover.
The NKQX24-MFT actuator uses 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.
Add-on auxiliary switches or feedback potentiometers are easily fastened
directly onto the actuator body for signaling and switching functions.
When combining signal and power cable together, see important
electrical installation diagram on page 164.
Dimensions (inches [mm])
5.47” [139]
6.30” [160]
1.18”
[30]
1.61”
[41]
2.05”
[52]
3.15”
[80]
3.86”
[98]
D
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