Belimo GM24 US - User Manual

GM24-SR US
Proportional damper actuator, non-spring return, direct coupled,
24 V for 2 to 10 VDC and 4 to 20 mA control signal.
G20492-IG-Subject to change. © Belimo Aircontrols (USA), Inc.
®
Torque min. 266 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 mounts directly to the damper operating shaft
with a universal V-bolt clamp assembly.
Operation
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 master-
slave applications.
The anti-rotation strap supplied with the actuator will prevent lat-
eral movement of the actuator. The angle of rotation is mechan-
ically limited to 95°. When reaching the damper or actuator end
position, the motor stops automatically. The gears can be man-
ually disengaged by simply pressing down the spring loaded but-
ton on the actuator cover. When this button is pressed down,
the damper blades can be adjusted by hand. The position of the
actuator is indicated by means of a scale reading 0 to 1.
The GM uses a brushless DC motor which is controlled by an
Application Specific Integrated Circuit (ASIC). The ASIC moni-
tors and controls the actuator’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 nor-
mal rotation without the need of mechanical end switches.
Dimensions
[All numbers in brackets are in millimeters.]
Technical Data GM24-SR US
Power supply 24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
Power consumption running: 3 W; holding: 2W
Transformer sizing 7 VA (class 2 power source)
Electrical connection 3 ft, 18 GA appliance 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, 0.5 mA max
Angle of rotation mechanically limited to 95°
Torque min 266 in-lb [30 Nm]
Direction of rotation reversible with switch A/B
A = CW with an increase in voltage
B = CCW with an increase in voltage
Position indication 0 to 1 and reversible indicator
Running time 135 sec. independent of load
Humidity 5 to 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 type 2
Housing rating UL94V-0 (flammability rating)
Agency listings UL 873 listed, CSA C22.2 No.24 certified, CE
Noise level max. 45 dB (A)
Servicing maintenance free
Quality standard ISO 9001
Weight 4.2 lbs (1.9 kg.)
LISTED
94D5
TEMP. IND &
REG. EQUIP.
U
L

104
2.12"
[54]
1.02" [26]
3.15"
[80]
4.88"
[124]
1.18" [30]
8.43" [214]
9.49" [241]
15/32" to 3/4" [12 to 20]
3/8" to 5/8" [9.5 to 16]
D012
©

Summary

GM24-SR US Product Overview

Technical Specifications Summary

Key electrical, performance, and physical data including power, torque, operating range, and certifications.

Application and Mounting Details

Purpose of the actuator, damper compatibility, and direct mounting via clamp assembly.

Operational Features and Control

Control signal inputs, feedback output, rotation limits, manual override, and brushless DC motor operation.

Accessories and Wiring

Available Accessories

List of optional accessories for the GM24-SR US actuator, including scaling modules and mounting brackets.

Wiring Diagrams

Illustrations showing connections for 0-10 VDC and 4-20 mA control signals, including feedback outputs.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

The GM24-SR US is a proportional damper actuator designed for modulating dampers in HVAC systems. It is a non-spring return, direct-coupled actuator that operates on 24 V and accepts a 2 to 10 VDC or 4 to 20 mA control signal.

Function Description:

The actuator modulates dampers in response to a control input from an electronic controller or positioner. It provides a 2 to 10 VDC feedback signal for position indication or master-slave applications. The GM24-SR US utilizes a brushless DC motor controlled by an Application Specific Integrated Circuit (ASIC). This ASIC monitors and controls the actuator's rotation, providing a digital rotation sensing function that prevents damage in a stall condition. The actuator can be stalled anywhere in its normal rotation without the need for mechanical end switches.

Important Technical Specifications:

• Power Supply: 24 VAC ± 20% 50/60 Hz or 24 VDC ± 10%.
• Power Consumption: Running: 3 W; Holding: 2 W.
• Transformer Sizing: 7 VA (class 2 power source).
• Torque: Minimum 266 in-lb [30 Nm].
• Control Signal: 2 to 10 VDC or 4 to 20 mA (with 500Ω resistor).
• Feedback Output: 2 to 10 VDC, 0.5 mA max.
• Angle of Rotation: Mechanically limited to 95°.
• Running Time: 135 seconds, independent of load.
• Ambient Temperature: -22°F to +122°F [-30°C to +50°C].
• Storage Temperature: -40°F to +176°F [-40°C to +80°C].
• Humidity: 5 to 95% RH, non-condensing.
• Noise Level: Max. 45 dB (A).
• Weight: 4.2 lbs (1.9 kg).
• Electrical Connection: 3 ft, 18 GA appliance cable with a 1/2" conduit connector.
• Housing Rating: NEMA type 2, UL94V-0 (flammability rating).
• Agency Listings: UL 873 listed, CSA C22.2 No.24 certified, CE.
• Overload Protection: Electronic throughout 0 to 95° rotation.

Usage Features:

• Mounting: The actuator mounts directly to the damper operating shaft using a universal V-bolt clamp assembly. An anti-rotation strap is supplied to prevent lateral movement.
• Control Input: Operates with a 2 to 10 VDC input. For 4 to 20 mA control, a 500Ω resistor (ZG-R01) is required to convert the signal to 2 to 10 VDC.
• Position Indication: A scale reading from 0 to 1 indicates the actuator's position. A 2 to 10 VDC feedback signal is also provided.
• Manual Override: The gears can be manually disengaged by pressing a spring-loaded button on the actuator cover, allowing for manual adjustment of damper blades.
• Direction of Rotation: Reversible with a switch (A/B). Position A results in CW rotation with an increase in voltage, while position B results in CCW rotation with an increase in voltage.
• Parallel Connection: Multiple actuators can be connected in parallel. For 0 to 10 VDC control, power consumption and input impedance must be observed. For 4 to 20 mA control, up to 4 actuators can be wired in parallel with one 500Ω resistor, though a +2% shift of control signal may be required.
• Compatibility: Designed for proportional modulation of dampers in HVAC systems. Actuator sizing should adhere to the damper manufacturer's specifications.

Maintenance Features:

• Maintenance-Free: The device is designed to be maintenance-free.
• Warranty: Comes with a 5-year warranty.
• Overload Protection: Electronic overload protection is built-in, covering the entire 0 to 95° rotation range, preventing damage to the actuator.

Belimo GM24 US Specifications