AbsolutAire NMCB24-SR User Manual
184
J20741 - Subject to change. © Belimo Aircontrols (USA), Inc.
NMCB24-SR
Proportional Control, Non-Spring Return, Direct Coupled, 24V, for 2 to 10 VDC and 4 to 20 mA
Technical Data NMCB24-SR
Power Supply 24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
Power Consumption 2.5 W (0.4 W)
Transformer Sizing 5 VA (Class 2 power source)
Electrical Connection 3 ft, 18 GA plenum rated cable
1/2” conduit connector
Overload Protection electronic throughout 0 to 95° rotation
Operating Range Y 2 to 10 VDC, 4 to 20 mA
Input Impedance 100 kΩ (0.1 mA), 500Ω
Feedback Output U 2 to 10 VDC (max 0.5 mA)
Angle of Rotation max. 95°, adjust. with mechanical stop
Torque 90 in-lb [10 Nm]
Direction of Rotation
reversible with switch. Actuator will move:
=CCW with decreasing control signal (10➞2V)
=CW with decreasing control signal (10➞2V)
Position Indication reflective visual Indicator (snap-on)
Manual Override external push button
Running Time 45 seconds, constant independent of load
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 NEMA 2/IP54
Housing Material UL94-5VA
Agency Listings† cULus acc. to UL 60730-1A/-2-14,
CAN/CSA E60730-1, CSA C22.2
No. 24-93, CE acc. to 89/336/EEC
Noise Level <45dB(A)
Servicing maintenance free
Quality Standard ISO 9001
Weight 1.7 lbs [0.75 Kg]
†Rated Impulse Voltage 800V, Type of action 1,
Control Pollution Degree 3.
Torque min. 90 in-lb for control of damper
surfaces up to 22 sq ft.
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, 1/2” self centered
default. A crankarm 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 500Ω 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 or masterslave applications.
Operation
The actuator is not provided with and does not require any
limit switches, but is electronically protected against overload.
The anti-rotation strap supplied with the actuator will prevent
lateral movement.
The NM series provides 95° of rotation and a visual indicator
indicates position of the actuator. When reaching the damper
or actuator end position, the actuator automatically stops. The
gears can be manually disengaged with a button on the actuator cover.
The NMCB24-SR… actuators use a sensorless Brushless DC
motor, which is controlled by an Application Specific
Integrated Circuit (ASIC). The ASIC monitors and controls the
actuator’s rotation and provides a digital rotation sensing
(DRS) function to prevent damage to the actuator in a stall
condition.Power consumption is reduced in holding mode.
Add on auxiliary switches or feedback potentiometers are
easily fastened directly onto the actuator body for signaling
and switching functions
Dimensions
(All numbers in brackets are in millimeters.)
2.36” [60]
3.15” [80]
4.88” [124]
3.66” [93]
3.9” [99]
0.98”
[25]
2.42” [61.4]
2” [50.8]
1/2” to 1.05” [12.7 to 26.67]
2/5” to 1.05” [10 to 26.67]
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185
J20741 - Subject to change. © Belimo Aircontrols (USA), Inc.
NM
NMCB24-SR
Proportional Control, Non-Spring Return, Direct Coupled, 24V, for 2 to 10 VDC and 4 to 20 mA
NMCB24-SR - Typical Specification:
Proportional control damper actuators shall be electronic
direct-coupled type, which require no crankarm and linkage
and be capable of direct mounting to a shaft up to 1.05”
diameter. Actuators must provide proportional damper control in 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. A 2 to 10 VDC feedback signal
shall be provided for position indication. 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.
Accessories
K-NA Reversible Clamp
ZG-100 Universal Mounting Bracket
ZG-101 Universal Mounting Bracket
ZG-103 Universal Mounting Bracket
ZG-104 Universal Mounting Bracket
ZG-NMA Crankarm Adaptor Kit
AV8-25 Universal Shaft Extension
ZG-NMSA-1 Shaft Adaptor
ZS-T Terminal Cover for NEMA 2/IP54
ZS-100 Weather Shield - Steel
ZS-150 Weather Shield - Polycarbonate
Tool-06 8 mm & 10 mm Wrench
S1A, S2A Auxiliary Switch (es)
P370 Shaft Mount Auxiliary Switch
P…A Feedback Potentiometers
SGA24 Min positioners in NEMA 4 housing
SGF24 Min positioners for flush panel mounting
PTA-250 Pulse Width Modulation Interface
IRM-100 Input Rescaling Module
ADS-100 Analog to Digital Switch
ZG-R01 Resistor for 4 to 20 mA Conversion
NSV24 US Battery Back-Up Module
ZG-X40 Transformer
Note: When using NMCB24-SR… actuators, only use acces-
sories listed on this page.
Wiring Diagram
W261
2 to 10 VDC and 4 to 20 mA control of NMCB24-SR
®
1
24 V AC Transformer
Line
Volts
Control Signal
2 to 10 VDC
2 to 10 VDC
Feedback Signal
(–)
(+)
(–)
(+)
2
Blk (1) Common
Red (2) Hot +
Wht (3) Y Input, 2 to 10V
Org (5) U Output, 2 to 10V
1 0
–
3
24 V AC Transformer
1
Line
Volts
2
Blk (1) Common
Red (2) Hot +
Ω
4 to 20 mA
Control Signal
(–)
(+)
500Ω
Wht (3) Y Input, 2 to 10V
4
Org (5) U Output, 2 to 10V
5
To other
actuators
1 0
Notes:
Provide overload protection and disconnect as required.
1
Actuators may be connected in parallel. Power
2
consumption and input impedance must be observed.
Actuator may also be powered by 24 VDC.
3
The ZG-R01 500Ω resistor converts the 4 to 20 mA
4
control signal to 2 to 10 VDC, up to 2 actuators may
be connected in parallel.
5
Only connect common to neg. (–) leg of control circuits.
–
3
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