800-543-9038
USA
866-805-7089
CANADA
203-791-8396
LATIN AMERICA / CARIBBEAN
65
AFB24-MFT95, AFX24-MFT95
Proportional, Spring Return, 24 V, for Use with Honeywell
®
Electronic Series 90 or a 0 to 135
Ω
Input
• Torque min. 180 in-lb
• Control fixed, 0 to 135
Ω
input, or Honeywell series 90 (fixed)
• Feedback 2 to 10 VDC (DEFAULT)
Application
For proportional modulation of dampers and control valves in HVAC systems. The
AFB24-MFT95, AFX24-MFT95 provides mechanical spring return operation for reliable
fail-safe application.
Default/Configuration
Default parameters for 0 to 135
Ω
Input applications of the AFB24-MFT95 and AFX24-
MFT95 actuator are assigned during manufacturing. If required, custom versions of the
actuator can be ordered. However the control input cannot be modified via MFT PC
tool software. The parameters noted in the Technical Data table are variable.
These parameters can be changed by three means:
• Pre-set configurations from Belimo
• Custom configurations from Belimo
•
Configurations set by the customer using the MFT PC tool (version 3.4 or higher)
software application.
Operation
The AFB24-MFT95, AFX24-MFT95 actuator provides 95° of rotation and is provided
with a graduated position indicator showing 0° to 95°. The actuator will synchronize
the 0° mechanical stop or the physical damper or valve mechanical stop and use this
point for its zero position during normal control operations. A unique manual override
allows the setting of any actuator position within its 95° of rotation with no power
applied.This mechanism can be released physically by the use of a crank supplied
with the actuator. When power is applied the manual override is released and the
actuator drives toward the fail-safe position.
The actuator uses a brushless DC motor which is controlled by an Application Specific
Integrated Circuit (ASIC) and a microprocessor. The microprocessor provides the
intelligence to the ASIC to provide a constant rotation rate and to know the actuator’s
exact position. The ASIC monitors and controls the brushless DC motor’s rotation and
provides a Digital Rotation Sensing (DRS) function to prevent damage to the actuator
in a stall condition. The position feedback signal is generated without the need for
mechanical feedback potentiometers using DRS. The actuator may be stalled
anywhere in its normal rotation without the need of mechanical end switches.
The AFB24-MFT95, AFX24-MFT95 is mounted directly to control shafts up to 1.05"
diameter by means of its universal clamp and anti-rotation bracket. A crank arm and
several mounting brackets are available for damper applications where the actuator
cannot be direct coupled to the damper shaft. The spring return system provides
minimum specified torque to the application during a power interruption. The AFB24-
MFT95, AFX24-MFT95 actuator is shipped at +5° (5° from full fail-safe) to provide
automatic compression against damper gaskets for tight shut-off.
Technical Data
AFB24-MFT95, AFX24-MFT95
Power supply
24 VAC, +/- 20%, 50/60 Hz
24 VDC, +20% / -10%
Power
consumption
running 7.5 W
holding 3 W
Transformer sizing
10 VA (Class 2 power source)
Electrical connection
AFB24-MFT95
3 ft, 18 GA plenum cable,
with 1/2” conduit connector
AFX24-MFT95
3 ft [1m], 18 GA plenum cable,
with or without 1/2” conduit connector
Overload protection
electronic throughout 0 to 95° rotation
Operating range Y
0 to 135
Ω
Honeywell Electronic Series 90,
0 to 135
Ω
input
Feedback output U*
2 to 10 VDC, 0.5 mA max
Torque
minimum 180 in-lb (20 Nm)
Direction
of rotation*
spring reversible with cw/ccw mounting
motor reversible with built-in switch
Mechanical
angle of rotation*
95° (adjustable with mechanical end stop, 35° to 95°)
Running time
spring <20 seconds @ -4°F to 122°F [-20° C to 50° C];
<60 seconds @ -22°F [-30° C]
motor*
150 seconds (default), variable (70 to 220 seconds)
Angle of Rotation
adaptation
off (default)
Position indication
visual indicator, 0° to 95°
(0° is spring return position)
Manual override
5 mm hex crank (
³⁄₁₆
" Allen), supplied
Humidity
max. 95% RH, non-condensing
Ambient temperature
-22 to 122° F (-30 to 50° C)
Storage temperature
-40 to 176° F (-40 to 80° C)
Housing
NEMA 2, IP54, Enclosure Type 2
Housing material
zinc coated metal and plastic casing
Noise level
≤
40dB(A) motor @ 150 seconds, run time dependent
≤
62dB(A) spring return
Agency listings
†
cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-
1:02, CE acc. to 2004/108/EC & 2006/95/EC
Quality standard
ISO 9001
Servicing
maintenance free
Weight
4.6 lbs. (1.9 kg)
* Variable when configured with MFT options
† Rated Impulse Voltage 800V, Type of action 1.AA (1.AA.B for -S version), Control Pollution Degree 3.
Programmed for 70 seconds motor run time. At 150 sec motor run time, transformer sizing is 8.5 VA
and power consumption is 6 W running / 3 W holding.
Dimensions
(Inches [mm])
A
FBNFBDim
K7-2
(supplied)
1/2"
Centered
(Default)
3/4"
Centered
(Field
Selectable)
1.05" Centered
(Field Selectable)
N40103 - 09/11 - Subject to change.
© Belimo
Aircontrols (USA),
Inc
.
