SmartFan®Cirrus-6
PWM Fan Speed Control and Alarm for 4-wire Fans
SmartFan Cirrus-6 PWM Fan Speed Control
SmartFan Cirrus-6 PWM Fan Speed Control and Alarm for 4-wire FansOperation/Installation Manual
SmartFan Cirrus-6 is a PWM fan speed control and alarm that offers an off-the-shelf cooling solution for 4-wire fans and blowers. Cirrus-6 can control and monitor tach pulses from up to six 12, 24, or 48 VDC 4-wire fans. The PWM fan speed control and alarm accepts fan speed control commands (including on/off) and provides individual pass/fail fan status via an I2C interface.
The I2C interface also provides temperature readings from an on-board thermistor and EEPROM storage. The Cirrus-6 can be configured for PWM fan speed control based on temperature or analog control signal (PWM, 5.0 VDC). Configuration of the Cirrus-6 PWM fan speed control and alarm is settable via I2C inteface or options can be set at the factory to your specifications.
I2C Design Tips: Check out our review of the advantages of using I2C communication for PWM fan speed control in telecom cooling applications.
In addition to the standard line of SmartFan controls and alarms, Control Resources also provides custom control design and manufacturing services to provide you with the optimum cooling solution for your OEM PWM fan speed control applications.
Features / Options – SmartFan Cirrus-6 PWM Fan Speed Control and Alarm for 4-wire Fans
- Power feed options:
- Single
- Dual diode OR’d (positive, negative, both, none)
- Controls fans with open collector or 0-12 VDC control signal requirements:
- PWM fan speed control based on:
- I2C interface (single or dual)
- Temperature at an on-board or remote thermistor
- Analog control signal (PWM, 5.0 VDC)
- Single or dual I2C interface capability:
- Set PWM fan speed control based on temperature or I2C commands
- Write fan speed commands (including on/off)
- Read pass/fail status for each fan
- Read temperature readings from an on-board thermistor
- Allow access to EEPROM storage
- Monitors open collector or voltage source tach pulses from the fans and provides pass/fail status for each fan through the I2C interface, LED and CMOS outputs
- Compatible with SmartFan Multi SD for telecom 10-75 VDC dual feed buck regulator applications
- Optional individual fan fusing
- Sensors
Specifications – SmartFan Cirrus-6 PWM Fan Speed Control and Alarm for 4-wire Fans
- Power source: 10 to 60 VDC, single or dual feed
- Current Rating: 6 Amps @ 60°C or less
- Power source is fused with reverse polarity protection
- Fans: Up to six 12, 24, or 48 VDC 4-wire fans
- On-board 3.3 / 5.0 VDC isolated power for I2C and control signal interfaces
- Storage temperature: -40°C to 125°C
- Operating temperature: -20°C to 60°C
- Temperature accuracy and hysteresis: 2°C
- Weight: 1.9 oz (54 grams)
- RoHS (6/6) compliant
Cirrus-6 dimensions: 
Part Numbering – SmartFan Cirrus-6 PWM Fan Speed Control and Alarm for 4-wire Fans
| Part Number | Fan Control Signal |
| 4WR6C00-F 4WR6V00-F H125-F |
Open Collector PWM 0-12 VDC PWM Hardware Pack |
When used in the temperature or transducer (5.0 VDC) control mode, a sensor (sold separately) is required.
Choose an air, surface or liquid temperature sensor or humidity sensor from the CRI catalog or via your own transducer.
Manual Pages – SmartFan Cirrus-6 PWM Fan Speed Control and Alarm for 4-wire FansOperation/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.
