SmartFan®Fusion-4 Manual
OPERATION
SMARTFAN FUSION DC FAN SPEED CONTROL AND ALARM OPERATION
Remote Sensor Selection (J12)
When configured to operate with a remote external temperature sensor, choose a compatible SmartFan Sensor shown in the SmartFan Catalog or at www.controlres.com/sensors.htm. Control temperature is set through the I2C bus.
Board-Mounted Temperature Sensor
In this configuration, fan voltage is proportional to the temperature at the sensor that is soldered to the Fusion-4. Control temperature is set through the I2C bus.
Fan Tachometer Setting
Since fan tachometer circuits are designed with one, two or even more pulse outputs per revolution, settings are listed in pulses per minute (PPM) rather than revolutions per minute (RPM). Given the fan’s speed under load (W) and the number of pulses per revolution (N), use the following formula to select the trigger speed (WA):
WA = W x N x 0.3
For example, a 3300-RPM fan with two pulses per revolution would have a trigger speed of
WA = 3300 RPM x 2PPR x 0.3 = 1980 PPM.
Since the 2000 PPM trigger is closest, set tachometer speed to 2000 PPM.
The alarm trigger accuracy is +/- 10%.
The Fusion-4 default factory setting is 2000 PPM.
Led Output Status Operation (J13)
LED outputs at J13 pins labeled 1, 2 and 3 are provided as follows:
LED1 is energized for any fault condition.
LED2 is energized when no fault is present.
LED3 is energized when the Fusion is powered.
Two leaded and three leaded (common cathode) bi-colored LEDs can also be used.
Alarm Logic (J13)
A single isolated Alarm output is provided on J13. The output is low resistance when there is no alarm and open during any alarm condition. The output is current limited to 100mA with an open voltage of 230 VAC/VDC.
Fan Voltage in any Alarm Condition
During the presence of any alarm condition, the full 24VDC voltage is applied to the fans.
Speed Override Input (J12 – Pin 4)
A logic level input is located on J12 that allows the user to command the fans to full speed when a ground level is applied. If this input is set to 3.3 VDC or open then the speed is set by its normal operating mode. Refer to Figure 1 for wiring details.
ADDITIONAL MANUAL PAGESOperation/Installation Manual
Use the links below for addtional manual pages or for a complete manual or click on the Operation/Installation Manual PDF link above.
