SmartFan® Cirrus-9 PWM Fan Speed Control

  • PWM Fan Speed based on I2C, Thermistor, or Analog Signal

  •    Controls up to 9 “4-wire” Fans at up to 15 Amps
  •    Redundant Power Inputs up to 76 VDC
  •    Factory Customization for Orders as Low as 50 Pieces
Operation / Installation PDF

Cirrus-9 Datasheet

The SmartFan Cirrus-9 fan control was specifically designed to meet the demanding requirements of many telecommunications fan tray specifications. It can control up to 9 “4-wire” (12, 24 or 48VDC) fans based on dual I2C communications, temperature sensing or assorted analog control inputs. Other features include redundant power inputs of up to 76 VDC (when used with the SmartFan Storm power regulator), optional individual fan fusing and assorted alarm outputs all in a slim 1.5″ (38mm) width board. Contact CRI to learn how the Cirrus-9 can be customized for your application or to ask about custom fan control design and complete fan tray assembly services.

I2C Design Tips: Check out the advantages of using I2C communication for PWM fan speed control in telecom cooling applications.

Specifications Features / Selectable Options
  • » Power source: 10 to 60 VDC, up to 76V using Storm DC power regulator
  • » Single or dual power feeds
  • » Current Rating: 15 Amps @ 60°C or less
  • » Fans: Up to nine 12, 24, or 48 VDC 4-wire fans
  • » Compatible with open collector PWM fans (model # 4WR9C00-F) or 0-12VDC PWM fans (model # 4WR9V00-F)
  • » 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: 4.6 oz (130 grams)
  • » RoHS (6/6) compliant
  • » Power feed options:
    • – Single
    • – Dual Active OR’d (positive and negative)
  • » Power source is fused with reverse polarity protection
  • » PWM fan speed control based on:
  • » 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)
    • – Report pass/fail status for each fan
    • – Report 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 Storm and Multi SD for 20 – 76 VDC dual feed buck regulator applications
  • » Optional individual fan fusing

Cirrus-9 PWM Fan Control Dimensions

 For CAD drawings, use the links in Additional Information below.

Cirrus-9 PWM Fan Control Part Numbers

Part No. Description
4WR9C00-F Open Collector PWM Fan Control Signal
4WR9V00-F 0-12 VDC PWM Fan Control Signal
H128-F Hardware Pack (Connectors, Terminals, Mounting)


Additional Information

» Cirrus-9 Operation / Installation Datasheet (PDF)
» Cirrus-9 IGS CAD drawing (.igs)
» SmartFan Price List (PDF)
» Click here for Questions or Comments

To talk to an Engineer or Service Representative, call (978) 486-4160 (9:00 AM – 5:00 PM EST)

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Initially designed for our own engineering lab, CRI also offers versatile, low cost test equipment for test benches, laboratories, field work and repair facilities.