Hach sc200, Руководство пользователя

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800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA
3
06/10 - Sub
ject to chan
g
e.
© Belimo
Aircontrols
(USA
), Inc.
AFB24-SR, AFB24-SR-S, AFX24-SR, AFX24-SR-S
Proportional, Spring Return, 24 V, for 2 to 10 VDC or 4 to 20 mA Control Signal
Torque min. 180 in-lb, for control of air dampers
Application
For proportional modulation of dampers in HVAC systems. Actuator sizing should be
done in accordance with the damper manufacturer’s specifications.
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
Ω
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 AFB and AFX series actuators provide true spring return operation for reliable fail-
safe application and positive close-off on air tight dampers. The spring return system
provides constant torque to the damper with, and without, power applied to the
actuator.
The AFB and AFX series provides 95° of rotation and is provided with a graduated
position indicator showing 0° to 95°.
The AFB24-SR and AFX24-SR 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 fail-safe position. The ASIC monitors and controls
the brushless DC motor’s rotation and provides a digital rotation sensing function to
prevent damage to the actuator in a stall condition. The actuator may be stalled
anywhere in its normal rotation without the need of mechanical end switches.
The AFB24-SR-S and AFX24-SR-S versions are provided with two built-in auxiliary
switches. These SPDT switches provide safety interfacing or signaling, for example, for
fan start-up. The switching function at the fail-safe position is fixed at +10°, the other
switch function is adjustable b10° to +90°. The AFB24-SR, AFB24-SR-S,
AFX24-SR and AFX24-SR-S actuator is shipped at +5° (5° from full fail-safe) to
provide automatic compression against damper gaskets for tight shut-off.
ATTENTION:
AFB24-SR(-S) and AFX24-SR(-S) cannot be tandem mounted on the
same damper or valve shaft. Only On/Off and MFT AF models can be used for tandem
mount applications.
Dimensions (Inches [mm])
K7-2 (supplied)
1/2" Centered
(Default)
3/4" Centered
(Field Selectable)
1.05" Centered
(Field Selectable)
W
AFBNFBDim
Technical Data AFB24-SR, AFB24-SR-S,
AFX24-SR, AFX24-SR-S
Power supply 24 VAC ±20%, 50/60 Hz
24 VDC +20% / -10%
Power consumption running 5.5 W
holding 3 W
Transformer sizing 8.5 VA (class 2 power source)
Electrical connection
AFB... 3 ft, 18 GA appliance cable, 1/2" conduit
connector
-S models: two 3 ft, 18 gauge appliance cables
with 1/2” conduit connectors
AFX...
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 20mA
Input impedance 100 k
Ω
for 2 to 10 VDC (0.1 mA)
500
Ω
for 4 to 20 mA
Feedback output U 2 to 10 VDC (max. 0.5 mA)
Torque 180 in-lb [20 Nm] minimum
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 95 seconds
Position indication visual indicator, 0° to 95°
(0° is full spring return position)
Manual override 5 mm hex crank (
³⁄₁₆
" Allen), supplied
Humidity max. 95% RH non-condensing
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 Nema 2, IP54, Enclosure Type2
Housing material zinc coated metal and plastic casing
Agency listings
†
cULus acc. to UL60730-1A/-2-14, CAN/CSA
E60730-1:02, CE acc. to 2004/108/EC &
2006/95/EC
Noise level
≤
40dB(A) motor @ 95 seconds
≤
62dB(A) spring return
Servicing maintenance free
Quality standard ISO 9001
Weight 4.6 lbs (2.1 kg); 4.9 lbs (2.25 kg) with switches
† Rated Impulse Voltage 800V, Type of action 1.AA (1.AA.B for -S version), Control Pollution Degree 3.
AFB24-SR-S, AFX24-SR-S
Auxiliary switches 2 x SPDT 3A (0.5A) @ 250 VAC, UL approved
one set at +10°, one adjustable 10° to 90°
AFB24-SR, A