GKB24-SR, GKX24-SR
Proportional Control, Fail-Safe, Operation, Direct Coupled, 24V, for 2 to 10 VDC and 4 to 20mA
Torque min. 360 in-lb for control damper surfaces up to 90 sq ft.
Application
For proportional modulation of dampers in HVAC systems.
The GKB24-SR and GKX24-SR provide 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 actuator operates in response to a 2 to 10 VDC, or with the addition of
a 500 Ω resistor, a 4 to 20mA control input from an electronic controller or
positioner. A 2 to 10 VDC feedback signal is provided for position indication or
master-slave applications.
Operation
The actuator is electronically protected against overload. The anti-rotation
strap supplied with the actuator will prevent lateral movement.
Fail-safe position
Position indication
Manual override
Running time
normal operation
fail-safe
Humidity
Ambient temperature
Storage temperature
Housing
Housing material
Agency list
Noise level
Servicing
Quality standard
Weight
D313
reversible with
switch
adjustable with dial or tool 0 to 100% in 10%
increments
reflective visual indicator (snap-on)
external push button
7.05” [179]
150 seconds (default), variable 90 to 150 seconds
35 seconds
5 to 95% RH non-condensing (EN 60730-1)
-22°F to +122°F [-30°C to +50°C]
-40°F to +176°F [-40°C to +80°C]
NEMA2, IP54, UL enclosure type 2
UL94-5VA
cULus acc. to UL 60730-1A/-2-14
CAN/CSA E60730-1:02
CE acc. to 2004/108/EEC and 2006/95/EC
< 45dB(A)
maintenance free
ISO 9001
3.85 lbs [1.75 kg]
800-543-9038 USA
153
Dimensions (inches [mm])
866-805-7089 CANADA
1.58” [40]
6.73” [171]
1.42” [36]
203-791-8396 LATIN AMERICA
M40024 - 05/10 - Subject to change. © Belimo Aircontrols (USA), Inc.
Torque
Direction of rotation
Add-on auxiliary switches or feedback potentiometers are easily fastened
directly onto the actuator body for signaling and switching functions.
2.36” [60]
Overload protection
Operation range Y
Input impedance
Feedback output U
Angle of rotation
The GKB24-SR and GKX24-SR actuators use a brushless DC motor, which
is controlled by an Application Specific 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.
4.57” [116]
Power consumption
Transformer sizing
Electrical connection
GKB24-SR, GKX24-SR
24VAC ±20% 50/60Hz
24VDC ±10%
12W (3W)
21VA (class 2 power source)
18 GA plenum rated cable
½" conduit connector
protected NEMA 2 (IP54)
3 ft [1m] 10 ft [3m] 16 ft [5m]
electronic throughout 0 to 95 rotation
2 to 10 VDC, 4 to 20mA (default)
100kΩ (0.1 mA), 500Ω
2 to 10VDC, 0.5mA max, VDC variable
max. 95°, adjustable with mechanical stop
electronically variable
360 in-lb [40 Nm]
3.43” [87]
Technical Data
Power supply
The GKB24-SR and GKX24-SR provide 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.
GKB24-SR, GKX24-SR
Proportional Control, Fail-Safe, Operation, Direct Coupled, 24V, for 2 to 10 VDC and 4 to 20mA
Accessories
K-GM20
ZG-102
ZG-GMA
ZG-JSA (-1,2,3)
ZS-100
ZS-150
ZS-260
ZS-300 (-1) (-5)
Tool-07
PS-100
S1A, S2A
P370
P…A
Wiring Diagrams
¾" [20mm] Shaft Clamp
Multiple Actuator Mounting Bracket
Crank arm Adaptor Kit
Jackshaft Adaptors for Hollow Jackshafts
Weather Shield - Steel
Weather Shield - Polycarbonate
Explosion Proof Housing
NEMA 4X Housing
13 mm Wrench
Actuator Power Supply Simulator
Auxiliary Switch(es)
Shaft Mount Auxiliary Switch
Feedback Potentiometers
1
Provide overload protection and disconnect as required.
2
CAUTION
N Equipment Damage!
3
Actuators may also be powered by 24 VDC.
Actuators may be connected in parallel if not mechanically mounted
to the same shaft. Power consumption and input impedance must be
observed.
Meets UL requirements without the need of an electrical ground
connection.
The ZG-R01 500 Ω resistor may be used.
Note: When using GKB24-SR and GKX24-SR actuators, only use accessories listed
on this page.
WARNING
G Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it
may be necessary to work with live electrical components. Have a qualified
licensed electrician or other individual who has been properly trained in
handling live electrical components perform these tasks. Failure to follow all
electrical safety precautions when exposed to live electrical components could
result in death or serious injury.
Typical Specification
W399_08
Proportional control damper actuators shall be electronic direct-coupled type,
which require no crank arm and linkage and be capable of direct mounting to
shaft up to 1.05" diameter. Actuators must provide proportional damper control
response to a 2 to 10 VDC or, with the addition of a 500Ω resistor, a 4 to 20 mA
control input from an electronic controller or positioner. Actuators shall have
brushless DC motor technology and be protected from overload at all angles
of rotation. Actuators shall have reversing switch and manual override on the
cover. Run time shall be constant and independent of torque. Actuators shall
be cULus listed, have a 5-year warranty, and be manufactured under ISO 9001
International Quality Control Standards. Actuators shall be as manufactured by
Belimo.
Electrical Installation
T
–
~
Wiring diagram
+
Note
!
• Connect via safety isolation transformer.
• Parallel connection of other actuators possible.
Note performance data for supply.
1
2
3
DC 2 ... 10 V
5
VDC/4-20 mA
Cable lengths
C
~
T
Y
U
L2
Ltot
Note
When several actuators are connected in parallel,
the maximum cable length must be divided by the
number of actuators.
L1
1
2
3
5
A
N
L
AC
C 230 V
C
T
AC 24 V
Y
U
L1
Note
There are no special restrictions on installation if
the supply and data cable are routed separately.
1
Cable colors:
1 = black
2 = red
3 = white
5 = orange
=
=
=
=
=
3
5
A
Cross section
L2
/
0.75 mm2
1.00 mm2
1.50 mm2
2.50 mm2
T
A
C
L1
L2
Ltot
2
Actuator
Control unit
Belimo connecting cable, 1 m (4 x 0.75 mm2)
Customer cable
Maximum cable length
800-543-9038 USA
~
M40024 - 05/10 - Subject to change. © Belimo Aircontrols (USA), Inc.
DC 0 ... 10 V
Y
U
Max. cable length
Ltott = L1 + L2
AC
DC
<30 m
<5 m
<40 m
<8 m
<70 m
<12 m
<100 m
<20 m
Example for DC
1 m (L 1) + 4 m (L 2)
1 m (L 1) + 7 m (L 2)
1 m (L 1) + 11 m (L 2)
1 m (L 1) + 19 m (L 2)
A = Actuator
C = Control unit
L1 = Belimo connecting cable, 1 m (4 x 0.75 mm
m2)
866-805-7089 CANADA
203-791-8396 LATIN AMERICA
154