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33
EFB24-MFT, EFB24-MFT-S, EFX24-MFT, EFX24-MFT-S
Proportional, Spring Return, Direct Coupled, 24V, Multi-Function Technology
®
Technical Data
EFB24-MFT, EFB24-MFT-S,
EFX24-MFT, EFX24-MFT-S
Power supply
24 VAC, +/- 20%, 50/60 Hz
24 VDC, +20% / -10%
Power
running 9.5 W
consumption
holding 4.5 W
Transformer sizing
16 VA
Electrical connection
EFB24-MFT
EFB24-MFT-S
3 ft, 18 GA appliance cable, 1/2" conduit connector
-S models:
two 3 ft, 18 gauge appliance cables with
1/2” conduit connectors
EFX24-MFT
EFX24-MFT-S
3 ft [1m], 10 ft [3m] or 16 ft [5m] 18 GA appliance or
plenum cables, with or without 1/2” conduit connector
-S models:
two 3 ft [1m], 10 ft [3m] or
16 ft [5m] appliance cables with or without 1/2” conduit
connectors
Overload protection
electronic throughout 0 to 95° rotation
Operating range Y*
2 to 10 VDC, 4 to 20 mA (default)
variable (VDC, PWM, floating point, on/off)
Input impedance
100 k
Ω
for 2 to 10 VDC (0.1 mA)
500
Ω
for 4 to 20 mA
1500
Ω
for PWM, floating point and on/off control
Feedback output U*
2 to 10 VDC, 0.5 mA max (default)
Torque
270 in-lb [30 Nm] minimum
Direction of
spring reversible with cw/ccw mounting
rotation*
motor reversible with built-in switch
Mechanical
angle of rotation*
max. 95° (adjustable with mechanical end stop, 35° to
95°)
Running time
spring <20 sec @ -4°F to 122°F [-20° C to 50° C];
<60 sec @ -22°F [-30° C]
motor* 150 seconds (default), variable (60 to 150 seconds)
Angle of Rotation
adaptation
off (default)
Override control*
min position = 0%
mid. position = 50%
max. position = 100%
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 Type2
Housing material
aluminum diecast and plastic casing
Noise level
≤
45.3dB(A) motor @ 150 seconds, run time dependent
≤
71.4dB(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
9.82 lbs [4.45 kg], 10.14 lbs [4.6 kg] with switches
* 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 60 sec motor run time. At 150 sec motor run time, transformer sizing
is 12 VA and power consumption is 7 W running / 4.5 W holding.
i
EFB24-MFT-S, EFX24-MFT-S
Auxiliary switches
2 x SPDT 3A (0.5A) @ 250 VAC, UL approved
one set at +10°, one adjustable 10° to 85°
• Torque min. 270 in-lb for control of air dampers
• Control 2 to 10 VDC (Default)
• Feedback 2 to 10 VDC (Default)
Application
For proportional modulation of dampers in HVAC systems. The EFB24-MFT, EFX24-
MFT provides mechanical spring return operation for reliable fail-safe application.
Default/Configuration
Default parameters for 2 to 10 VDC applications of the EFB24-MFT, EFX24-MFT
actuator are assigned during manufacturing. If required, custom versions of the
actuator can be ordered. The parameters noted in the Technical Data table are
variable.
These parameters can be changed by three means:
• Pre-set or custom configurations from Belimo
•
Configurations set by the customer using the MFT PC tool (version 3.4 or higher)
software application.
•
Handheld ZTH-GEN
Operation
The EFB24-MFT, EFX24-MFT 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 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 EFB24-MFT, EFX24-MFT 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 EFB24-MFT, EFX24-MFT
actuator is shipped at +5° (5° from full fail-safe) to provide automatic compression
against damper gaskets for tight shut-off.
NOTE: Please see documentation on Multi-Function Technology.
Dimensions
(Inches [mm])
4.74 [120.5]
3.15 [80]
1.06 [27]
0.19 [4.85]
0.53 [13.5]
5.43 [138]
4.41 [112]
0.59 [15]
2.76 [70]
1.38 [35]
0.52 [13.3]
7.40 [188]
1.97 [50]
0.20 [5.2]
5.63 [143]
0.33 [8.3]
2.13 [54]
2.44 [62]
11.32 [287.5]
13.09 [332.5]
1.95 [49.5]
1.77 [45]
K9-2
(supplied)
1/2"
(Field Selectable)
3/4"
Centered
(Default)
1.05" Centered
(Field Selectable)
EF_NEMA2_dim
s
Installation Note:
Use flexible metal conduit. Push the UL listed conduit fitting device
over the actuator's cable to butt against the enclosure. Screw in conduit connector.
Jacket the actuators input wiring with UL listed flexible conduit. Properly terminate the
conduit in a suitable junction box.
N40103 - 09/11 - Subject to change.
© Belimo
Aircontrols (USA),
Inc
.
