9238

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DC Fan

9238

DC Fan

9238

, 92x92x38mm

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General Specification

Frame: Thermal Plastic, UL 94V-0
Impeller: ThermalPlastic, UL 94V-0
Lead Wires: UL Type （+） Red，（-）Black
Operation Temperature: -10℃~70℃, 35%~85%RH
Storage Temperature: -40℃~80℃, 35%~85%RH
Motor Protection: Impedance Protected, Reverse Polarity Protected

Function Description

The “Auto Restart” function of a DC fan allows the fan to automatically resume operation after a power interruption or when certain abnormal conditions are resolved. This feature ensures the uninterrupted operation of the fan without the need for manual intervention, enhancing the reliability and convenience of the equipment it serves.

Working Principle

When a power failure occurs, the fan stops rotating. The auto restart circuitry inside the fan detects the power loss and continuously monitors the power status. Once the power is restored, the circuitry transmits a signal to the fan’s motor to initiate its operation again. In some cases, if the fan encounters problems like overheating or abnormal load that cause it to stop, the auto restart function may also be activated. The fan will attempt to restart after a certain period or when the conditions return to normal, depending on the specific design of the fan.

Advantages

Enhanced Reliability: It guarantees that the cooling system keeps working, preventing equipment overheating and potential damage. This is particularly vital in critical applications where continuous operation is of utmost importance.
Reduced Downtime: With the automatic restart feature, there is no need to wait for manual intervention to restart the fan. This significantly shortens the equipment’s downtime and improves overall productivity.
Low Maintenance: The auto restart function minimizes the need for human monitoring and manual restart operations, reducing maintenance costs and efforts.

Function Description

The FG (Frequency Generator) function of a DC fan is a vital feature that offers real – time information about the fan’s rotational speed. It produces a frequency output signal that is directly proportional to the actual rotational speed of the fan. By measuring this frequency signal, users can accurately monitor the fan’s operating state and ensure it functions within the expected range. This function is of great significance in applications where precise control and monitoring of the fan’s performance are essential.

Working Principle

There is a built – in FG circuit inside the DC fan. As the fan rotates, the FG circuit uses a sensor, like a Hall – effect sensor, to detect the movement of the fan blades. For every full rotation of the fan blades, the FG circuit generates a fixed number of electrical pulses. The frequency of these pulses is directly related to the fan’s rotational speed. A higher rotational speed leads to a higher frequency of the output signal, and a lower rotational speed results in a lower frequency. The generated frequency signal can be easily measured and processed by external control systems or monitoring devices.

Advantages

Precise Monitoring: The FG function enables users to precisely monitor the fan’s rotational speed, which is crucial for maintaining the optimal operating conditions of the equipment. By knowing the exact speed of the fan, users can detect any abnormal changes in performance, such as a decrease in speed caused by mechanical failure or increased load.
Early Fault Detection: Thanks to the real – time speed monitoring provided by the FG function, potential faults in the fan or the equipment it cools can be detected at an early stage. For instance, if the fan speed drops significantly, it may indicate issues like bearing wear or a blocked air passage. Early detection allows for timely maintenance and prevents further damage to the equipment.
System Integration and Control: The frequency output signal from the FG function can be easily integrated into various control systems. This enables intelligent control of the fan’s speed based on the actual operating conditions of the equipment, such as adjusting the fan speed according to the system’s temperature. It helps in achieving better energy efficiency and system performance.

Function Description

The RD (Rotation Detection) function of a DC fan is dedicated to detecting the rotation status of the fan. It gives clear information about whether the fan is rotating smoothly or has come to a halt. This function plays a crucial role in guaranteeing the proper operation of the cooling system and preventing potential damage to the equipment caused by fan malfunctions. By constantly monitoring the rotation of the fan, the RD function can promptly identify any abnormalities and facilitate the implementation of appropriate countermeasures.

Working Principle

The RD function commonly employs sensors, such as Hall – effect sensors or optical sensors. A Hall – effect sensor works by detecting the magnetic field variations generated by the rotation of the fan’s rotor. As the rotor spins, the magnetic field lines passing through the sensor change, prompting the sensor to generate corresponding electrical signals. These signals are then processed by the fan’s control circuit to determine the fan’s rotation status. In the case of an optical sensor, it operates by detecting the interruption or reflection of light triggered by the rotation of the fan blades. The control circuit analyzes the received light signals to ascertain whether the fan is in rotation.

Advantages

Fault Detection: The RD function can swiftly detect if the fan stops rotating due to factors like motor failure, blade blockage, or power problems. This early detection helps prevent overheating of the equipment being cooled by the fan, reducing the risk of component damage and system malfunctions.
System Reliability: By continuously monitoring the fan’s rotation, the RD function improves the overall reliability of the system. It enables proactive maintenance as operators can be notified when the fan shows signs of abnormal rotation. This facilitates the scheduling of timely repairs or replacements, minimizing unexpected downtime.
Safety Enhancement: In some applications, such as in industrial machinery or data centers, the proper functioning of cooling fans is vital for safety. The RD function ensures that the cooling system operates as expected, preventing potential fire hazards or other safety risks associated with overheating.

Our company’s DC fans have an IP54 rating.

Function Description

The IP (Ingress Protection) rating of our company’s DC fans is a standardized system. It precisely defines the fans’ ability to resist the intrusion of solid particles and liquids. This rating provides crucial information regarding the fans’ protection levels against dust, dirt, water splashes, and other external contaminants. With an IP54 rating, our DC fans are well – equipped to handle a certain degree of environmental challenges. It helps our customers select the most suitable fans for their specific application scenarios, ensuring reliable operation and long – term stable performance.

Rating Criteria

The IP rating is composed of two digits. The first digit indicates the level of protection against solid particle ingress, ranging from 0 (no protection) to 6 (complete protection against dust ingress). In the case of our IP54 fans, the “5” as the first digit means that the fans are effectively protected against the ingress of dust in quantities that could interfere with normal operation. The second digit represents the level of protection against liquid ingress, ranging from 0 (no protection) to 8 (protected against long – term immersion in water under specific conditions). The “4” in our IP54 rating shows that the fans can withstand water splashes from any direction, providing reliable protection in environments with occasional water splashing.

Functions and Advantages

Adaptability to Diverse Environments: Our IP54 – rated DC fans are highly adaptable and can be used in a wide range of environments. They are suitable for both indoor and outdoor applications where there may be some dust and occasional water splashes, such as in certain industrial settings, outdoor electrical enclosures, and some machinery equipment. This adaptability significantly expands the application scope of our DC fans.
Improved Durability: The IP54 protection effectively prevents dust and water from penetrating into the internal components of the fans. This greatly reduces the risk of corrosion, short – circuits, and mechanical wear caused by contaminants. As a result, the service life of our fans is extended, and maintenance costs are significantly reduced.
Reliable Performance: Thanks to the IP54 protection, our DC fans can maintain stable performance over time. By shielding the fans from external contaminants, the IP rating ensures that the fans can operate properly under various conditions. This is particularly important in critical applications where the stable operation of the fans is crucial for the overall functionality of the equipment.

Function Description

The PWM (Pulse Width Modulation) function in DC fans is an advanced speed – control mechanism. It empowers users to regulate the rotational speed of the fan by altering the width of electrical pulses. This feature offers great flexibility in controlling the air flow volume and heat dissipation capacity, enabling the fan to adapt to diverse operating conditions. Instead of operating at a constant speed all the time, the fan can be adjusted according to the actual needs of the system, making it more energy – efficient and effective in heat dissipation.

Working Principle

The PWM function operates by sending a series of square – wave electrical pulses to the fan motor. The duty cycle of these pulses, which is the ratio of the time the pulse is at a high (on) level to the total time of one pulse cycle, determines the average voltage applied to the motor. When the duty cycle is increased, the average voltage supplied to the motor goes up, causing the fan to rotate faster. Conversely, when the duty cycle is decreased, the average voltage drops, and the fan rotates more slowly. By continuously adjusting the duty cycle of the PWM signal, the fan’s rotational speed can be precisely controlled within a wide range.

Advantages

Energy Efficiency: The PWM function allows the fan to run at the minimum speed necessary to meet the cooling requirements of the system. This reduces unnecessary power consumption, particularly when the system doesn’t require full – speed cooling. As a result, it helps save energy and cut down operating costs.
Quiet Operation: In cases where less cooling is needed, the fan can operate at a lower speed thanks to the PWM control. This significantly reduces the noise generated by the fan, creating a quieter working environment. It is especially beneficial for applications like data centers, where noise reduction is a crucial consideration.
Extended Fan Lifespan: By adjusting the fan speed based on the actual cooling demands, the PWM function lessens the wear and tear on the fan components. Running the fan at a lower speed for longer periods when possible helps extend its service life and reduce the frequency of maintenance and replacement.

Application Scenarios

PWM – controlled DC fans are extensively used in various fields. In computer systems, they can adjust the fan speed according to the CPU temperature, ensuring efficient cooling while minimizing noise and power consumption. In industrial equipment such as servers, power supplies, and telecommunications devices, the PWM function helps maintain optimal operating temperatures under different load conditions. They are also commonly used in automotive electronics, where they can adapt to the changing heat dissipation requirements of the vehicle’s electrical systems.

P&Q Curve(At rated voltage)

Technical Parameters

Listed Model	Bearing System	Rated Voltage	Operation Voltage	Rated Current	Input Power	Rated Speed	Max Air Flow		Max Static Pressure		Noise Level	Weight
Listed Model	Bearing System	VDC	VDC	A	Watt	RPM	CFM	m³/min	mmH₂O	inchH₂O	dBA	g
X9238D12UB	Ball	12	7.0~13.8	1.5	18	6800	137.1	3.9	32.3	1.28	59	190
X9238D12HB	Ball	12	7.0~13.8	1	12	5500	111	3.15	26.1	1.03	52	190
X9238D12MB	Ball	12	7.0~13.8	0.6	7.2	4200	84.9	2.4	20	0.79	43	190
X9238D12LB	Ball	12	7.0~13.8	0.4	4.8	3500	72.15	2.05	16.99	0.67	38	190
X9238D24UB	Ball	24	14.0~27.6	0.8	19.2	6800	137.1	3.9	32.3	1.28	59	190
X9238D24HB	Ball	24	14.0~27.6	0.6	14.4	5500	111	3.15	26.1	1.03	52	190
X9238D24MB	Ball	24	14.0~27.6	0.5	12	4200	84.9	2.4	20	0.79	43	190
X9238D24LB	Ball	24	14.0~27.6	0.4	9.6	3500	72.15	2.05	16.99	0.67	38	190
X9238D48UB	Ball	48	28.0~56.0	0.4	19.2	6800	137.1	3.9	32.3	1.28	59	190
X9238D48HB	Ball	48	28.0~56.0	0.3	14.4	5500	111	3.15	26.1	1.03	52	190
X9238D48MB	Ball	48	28.0~56.0	0.25	12	4200	84.9	2.4	20	0.79	43	190
X9238D48LB	Ball	48	28.0~56.0	0.15	7.2	3500	72.15	2.05	16.99	0.67	38	190

Notes:

All readings are typical values at rated voltage. Specifications subjected to change without prior notice. If you need to speed or voltage function not on the list, Please contact us.