How to Select a DC 24V Axial Fan | PWM/FG/RD Industrial Cooling Fan Guide
DC 24V axial fans are widely used in automation equipment, power supplies, communication equipment, energy storage, electrical control systems and other industrial equipment using 24V DC power. Deqing Jiefeng Electrical Co., Ltd. supplies DC axial fans in multiple sizes, allowing selection according to mounting space, airflow/static pressure, noise and control/signal functions.
1. Why Is DC 24V Common in Industrial Equipment?
24V DC is widely used in industrial control and automation systems. A DC 24V fan can match an existing low-voltage DC power system and can make speed control and operating-status monitoring easier to implement. The final voltage choice must still follow the equipment's electrical design.
2. Common Sizes of DC 24V Axial Fans
JIEFENGFAN DC axial fan size classes include 4010, 4020, 4028, 5010, 6025, 7025, 8025, 9225, 9238, 12025, 12038, 15038, 17251, 18060, 20060, 22580, 25489 and 28080. First confirm the mounting dimensions, then select the exact model according to airflow/static-pressure and functional requirements.
3. What Do PWM, FG and RD Mean?
PWM Speed Control
PWM is used to control fan speed. The equipment can adjust speed according to temperature or load, helping balance cooling performance, noise and energy use. Exact PWM electrical characteristics and control logic must be confirmed from the specific product specification.
FG Speed Feedback
FG typically outputs pulse signals related to fan speed, allowing the control system to determine whether the fan is running and to monitor rotational speed. Pulse format, pulse-to-speed relationship and interface characteristics must be confirmed for the specific model.
RD Running / Alarm Signal
RD is commonly used as a running-status or abnormal-status output. Definitions and output logic can vary by product, so always confirm the specification before connecting RD to a PLC or controller.
4. What Else Matters Besides 24V?
- Rated current and power: confirm power-supply capacity
- Starting and running conditions: avoid insufficient supply capacity during startup
- Airflow and static pressure: match the equipment cooling demand and airflow resistance
- Speed and noise: balance cooling performance and acoustic requirements
- Positive/negative polarity and wiring definitions: avoid reverse polarity or signal wiring errors
- PWM, FG and RD interfaces: confirm signal levels and control logic
- Locked-rotor protection, waterproofing or other functions: confirm according to the application
- Operating temperature, service life and bearing type: match long-term operating requirements
5. DC 24V vs. DC 12V / DC 48V: How to Choose
The voltage should first match the equipment's existing power supply. Different voltage versions are not directly interchangeable. Even when the frame and product family are similar, 12V, 24V and 48V models differ in current, winding design and electrical characteristics. Reconfirm power capacity, wiring and control interfaces before changing voltage.
6. What to Consider When Using a DC 24V Fan in a Control Cabinet
Control cabinets typically contain heat-generating components such as power supplies, PLCs and drives. Estimate the total heat load and allowable temperature rise before deciding the intake/exhaust arrangement. If the intake uses a filter, account for filter resistance and airflow reduction as dust accumulates. If fan-failure monitoring is required, consider a model with FG or RD functions.
7. Information to Provide When Purchasing a DC 24V Fan
- Mounting dimensions and hole pattern
- DC 24V supply and available power capacity
- Target airflow/static pressure or equipment heat load
- Operating temperature and exposure to dust/moisture
- Allowable noise
- Whether PWM speed control is required
- Whether FG speed feedback or RD status output is required
- Lead-wire length, terminal and wiring requirements
- Project quantity and customization requirements
8. About JIEFENGFAN DC Axial Fans
JIEFENGFAN DC axial fans cover small and industrial size classes for different installation spaces and cooling requirements. For a DC 24V project, first filter by size, then compare airflow, static pressure, speed, noise, current/power and PWM/FG/RD functions to determine the exact model.
Frequently Asked Questions (FAQ)
Can a DC 24V fan be connected to DC 12V?
It is not recommended. Use the fan at its rated voltage. A voltage mismatch can cause failure to start, insufficient performance or other abnormal operation.
Can every DC 24V fan use PWM speed control?
No. PWM support depends on the specific model and must be specified when ordering.
Are FG and RD the same signal?
No. FG is typically used for speed pulse feedback, while RD is typically used for running/abnormal status output. The final definitions must follow the specific model specification.
Are 12038 and 17251 sizes available in DC 24V?
JIEFENGFAN DC axial fan ranges include common 12038 and 17251 size classes. Confirm the specific 24V model, performance and available functions in the relevant product series.
Can a 24V fan be selected by airflow alone?
No. Static pressure, equipment resistance, dimensions, noise, power supply and control functions must also be considered.