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BL-A400C-EC-F05(B1) is a 400 mm EC backward-curved centrifugal fan powered by a 230 VAC single-phase EC motor. It supports 0–10 V / PWM speed control, RS485 Modbus RTU and tachometer feedback.
| Model No. | BL-A400C-EC-F05(B1) | Fan Type | EC Backward Curved Centrifugal Fan |
| Nominal Voltage | 230 VAC | Voltage Range | 184–276 VAC |
| Phase | Single phase (1~) | Frequency | 50/60 Hz |
| Nominal Speed | 1600 ±5% RPM | Max. Input Power | 500 W |
| Max. Input Current | 2.3 A | Sound Level | 70 dB(A) |
| Ambient Temperature | -25°C to +60°C | Storage Temperature | -40°C to +80°C |
| Overall Dimensions | 400 × 400 × 158 mm | Mode of Operation | S1 |
| Impeller Material | Plastic | Bearing | Ball bearing |
| Number of Blades | 5 | Direction of Rotation | Clockwise, viewed toward rotor |
| Airflow Direction | All around | Protection Class | IP44 |
| Insulation Class | F | Operating Humidity | 5–90% RH |
| Speed Control | 0–10 V / PWM | Communication | RS485 Modbus RTU |
| Signal Output | Tachometer, 5 pulses/revolution | Motor Protection | Locked-rotor, thermal, high/low-voltage and overcurrent protection; soft start |
| Certification | CCC, CE, RoHS | Data Method | Free air |
| 1 | Ventilation equipment requiring a 400 mm EC backward-curved fan | 2 | Air-handling systems within the specified electrical and environmental limits |
| 3 | Equipment cooling with controllable airflow | 4 | Installations using 0–10 V or PWM speed control |
| 5 | Systems requiring RS485 Modbus RTU communication | 6 | Applications requiring tachometer feedback |
Air performance was measured according to AMCA 210 / GB 1236 installation category A. Values apply under the specified measuring conditions and may vary with installation. For deviations from the standard configuration, verify the parameters on the installed unit.
Overall dimensions: 400 × 400 × 158 mm. Dimensional values are shown in millimetres.
| Line | Terminal | Designation | Colour | Function |
|---|---|---|---|---|
| Power Line | PE | PE | Green/Yellow | Protective earth |
| U1 | L | Brown | Live wire | |
| U2 | N | Blue | Neutral wire | |
| Control Line | U3 | RSA | Brown | RS485 Modbus RSA |
| U4 | RSB | Gray | RS485 Modbus RSB | |
| U5 | Speed Control | Yellow | 0–10 V / PWM control input | |
| U6 | Signal Feedback | White | Tachometer output, 5 pulses/revolution | |
| U7 | +10 V | Red | External +10 VDC output | |
| U8 | GND | Blue | Control ground |
Speed Setting
 |
1. Full Speed Short yellow VSP to red +10 VDC. The fan runs at full speed. |
 |
2. Voltage Control 0–10 VDC Apply 0–10 VDC between yellow VSP and blue GND. Above 1.0 VDC: fan starts; below 0.5 VDC: fan stops. |
 |
3. PWM Control PWM frequency: 1–10 kHz. Duty above 10%: fan starts; duty below 5%: fan stops; duty at or above 10% controls speed. |
 |
4. Potentiometer Control Use a 10 kΩ potentiometer between red +10 V, yellow VSP and blue GND. |
Wiring Label
Signal Feedback
The fan provides a tachometer speed-output signal. The pull-up resistor is connected by the customer. Vfg = 3–30 VDC and R ≥ 1000 × Vfg Ω.
Speed Calculation
n = 60f/a, where n is fan speed, a is the number of pulses per revolution, and f is the signal-output waveform frequency. This model provides 5 pulses per revolution.
Note
Connect the power and control lines strictly according to the wiring diagram.
Do not connect signal wires directly to an incompatible external DC power supply.
Verify the speed-control input voltage before start-up and do not touch the impeller or rotor after energising.
The fan may take several seconds to start after power-on.
The motor must not be operated without the impeller or load.
Store the product in a clean, well-ventilated location within the specified storage conditions.
BL-A400C-EC-F05(B1) Product Specification.pdf
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