12V PC CPU 4 Wire Fan Temperature Control PWM Speed Control Module with Alarm and Buzzer & Sensor Features Supports all 12V 4A fans, synchronous rectifier output, high efficiency. No additional heat sink required even under high current operation. Multiple fans can be used in parallel (total current not exceeding 5A). Supports automatic temperature control and manual speed control. Temperature control with four selectable temperature zones for flexible setup, suitable for various applications. Compatible with three-wire fans with stall warning monitoring function. Channels: 1. Temperature control 2. Manual control 3. High-temperature alarm 4. Automatic temperature control with PWM speed regulation Specifications Operating voltage: DC 12V Circuit load capacity: Maximum output current per channel 4A, bus current up to 9A Output range: - Channel 1: 20%–100% or 40%–100% (TFL = ON) - Channels 2 and 3: 10%–100% Note: The above ranges apply to PWM signal only; actual fan performance may vary depending on fan type. Temperature probe specifications: 50K B = 3950 Thermostat temperature zone accuracy: Depends on probe, typically ±3–5% Stall alarm trigger speed: 700–800 RPM Function Setting Switches TFL (Switch 1): Sets minimum PWM for temperature control channel. When ON, FAN1 minimum PWM is 40%; when OFF, minimum PWM is 20%. TP1 TP2 (Switches 2,3): Set temperature thresholds for fan speed control (used with temperature probe): - OFF OFF: Start cooling at 35°C, full speed at 45°C - ON OFF: Start cooling at 40°C, full speed at 55°C - OFF ON: Start cooling at 50°C, full speed at 70°C - ON ON: Start cooling at 60°C, full speed at 90°C When temperature is below the start threshold, fan runs at minimum speed. When temperature exceeds full speed threshold, fan runs at maximum speed. BF1 BF2 (Switches 4,5): Stall detection alarm switches for FAN1 and FAN2. When a connected fan stops, the controller activates ble and visual alarm (using buzzer). Alarm clears automatically when fan resumes operation. If both BF1 and BF2 are enabled, alarm triggers if either FAN1 or FAN2 stops. Package Included 1 x WS16 DC 12V 4A PWM PC CPU Fan Temperature Control Regulator 1 x Temperature Probe 1 x Buzzer