Ⅰ. Safety Precautions
Never touch the air inlet while the blower is running.
Secure the blower before operation to prevent vibration.
Keep away from water/corrosive substances – ensure no liquids or gases enter the air inlet.
Operating temperature: -20°C to 60°C (performance degrades beyond this range).
Ⅱ. Key Components
| Label | Component | Function |
|---|---|---|
| A | Switching Power Supply | Provides DC power |
| B | Power Cable | Connects to power supply (+V/-V) |
| C | Driver | Controls motor operation |
| D | Blower Unit | Main airflow generator |
| E | Control Wires | For speed/enable functions |
Ⅲ. Operation Steps
Step 1: Power Connection
Connect power cable (B) to switching power supply (A):
Red wire → +V terminal
Black wire → -V terminal
⚠️ Reverse polarity will damage the blower!
Step 2: Speed Control (Choose ONE Method)
| Method | Action |
|---|---|
| Potentiometer (Default) | Rotate knob (g) clockwise → Speed increases. |
| Analog Voltage (0-5V) | ① Cut potentiometer (g). ② Apply 0-5V between gray (e) and black (d) wires → Higher voltage = Faster speed. |
| PWM Signal | ① Cut potentiometer (g). ② Input 5V PWM (2-50kHz) to gray (e)-black (d) → Higher duty cycle = Faster speed. |
Step 3: Enable/Disable
Connect purple wire (c) to black wire (d): Blower STOPS.
Disconnect purple wire: Blower RUNS.
Step 4: Rotation Direction Check
Blades must rotate counterclockwise (viewed from air outlet).
⚠️ Reverse rotation may cause damage!
Ⅳ. Advanced Functions
Speed Feedback (White F6 Wire):
Pulse output: 1Hz = 60 RPM (WS7040 model) or 1Hz = 30 RPM (other models).
Overheat Protection:
Optional thermal sensor (C1) triggers shutdown if internal temperature exceeds limit.
Ⅴ. Critical Notes
Environment: Install in dry, ventilated areas.
Do NOT disassemble blades – Loss of dynamic balance will occur.
Power Requirements:
Voltage must match blower rating (e.g., 12V/24V).
Power supply current > Blower's max operating current (check specs).
Ⅵ. Troubleshooting (LED Indicators)
| LED State | Meaning |
|---|---|
| LED1 OFF | Driver/power failure |
| LED1 flashes 2x + pause | Low input voltage |
| LED1 flashes 3x + pause | High input voltage |
| LED2 OFF | Motor running |
| LED2 blinking evenly | Motor standby |
| LED1 & LED2 both ON | Driver overheating |
| LED2 slow flashes 4x + pause | Fan jammed (blocked) |
Full error codes: See Section 7 of manual.
Ⅶ. Warranty & Support
1-year warranty from purchase date.
Void if:
Product label/shell damaged.
User disassembly/modification.
Misuse (e.g., reverse rotation, wrong voltage).
Required for service: Original warranty card with customer/product details filled.
Pro Tip: Always refer to the model-specific datasheet for electrical specs. Contact Ningbo Donglai support if LED error codes persist.
Certifications: ISO9001, ROHS, SVHC, CE, SGS (Section 6).
