R1G225-AF11-52: Precision 48V DC Cooling
The R1G225-AF11-52 is a high-efficiency centrifugal fan designed for DC-powered applications, particularly in the telecommunications and railway sectors. This 225mm backward-curved motorized impeller operates on a nominal 48 VDC supply (range 36-57 VDC), making it the standard for -48V telecom rectifiers and battery cooling systems. Powered by ebm-papst’s GreenTech EC motor, it offers infinite speed control via a 0-10 VDC or PWM signal input, allowing for precise thermal management that adapts to the real-time load of the equipment.
Technical Specifications
- Impeller Diameter: 225 mm.
- Nominal Voltage: 48 VDC.
- Motor Type: M1G074-BF (EC Motor).
- Blade Material: PA plastic (Glass-fiber reinforced).
- Control Interface: 0-10V / PWM.
- Protection: Reverse polarity and locked-rotor protection.
Field Engineering & Integration
Lifecycle State: Active. Diagnosis: If the fan fails to start, first verify the 0-10V control voltage. Unlike AC fans, if the control wire (usually yellow or white) is disconnected or at 0V, the fan may stop or run at minimum speed depending on the firmware. Also, check the DC bus for stability; spikes above 60V can trigger over-voltage protection. Installation Advice: The inlet ring positioning is critical. A gap >2mm between the inlet nozzle and the impeller will cause a 20% drop in pressure capabilities. Compatibility: Perfectly suited for Siemens SITOP DC power systems. The tachometer output allows for integration into SNMP-based monitoring systems for remote alarm handling in unmanned shelters.
| Metric | Performance Data |
|---|---|
| Nominal Speed | 2600 – 2700 RPM |
| Airflow | 1100 – 1200 m³/h |
| Power Input | 95 – 110 W |
| Operating Temp | -25°C to +60°C |
Why 48V DC?
48V DC is the global standard for telecom uptime. Using a native DC fan like the R1G225 eliminates the need for failure-prone inverters, increasing overall system reliability.
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