SmartFan®Multi SR

I2C Fan Speed Control and Alarm for Telecom Cooling

 telecom cooling fan speed control smartfan multi srSmartFan Multi SR big4

SmartFan Multi SR I2C Fan Speed Control for Telecom Cooling

SmartFan Multi SR I2C Fan Speed Control and Alarm for Telecom CoolingOperation/Installation Manual telecom cooling fan speed control smartfan multi srpdf download

SmartFan Multi SR is a fan speed control and alarm that offers an off-the-shelf solution for telecom cooling applications. Multi SR accepts and diode ORs dual power feeds in the range from 36 to 75 VDC. Multi SR fan speed control can control to up to six 24 or 48 VDC fans and operates at a high frequency to achieve maximum power efficiency at minimum size. Fan speed control can be based on temperature, control signal (PWM, DC) or I2C bus.
Fan speed control is varied using a common mode buck/boost fan speed control circuit. Multi SR monitors tach pulses from the fans and provides fan failure alarm outputs to drive LED, logic and audible alarms. Communication of telecom cooling system status is provided via an I2C bus. Multi SR’s fan speed control and alarm parameters can be modified via on-board jumpers and FLASH microcontroller programming.
I2C Design Tips: Check out our article describing advantages of using I2C Communication for Fan Speed Control in Telecom Cooling Applications. The article includes I2C fan speed control protocol and operation examples found in many of our standard SmartFan fan speed control products.
In addition to the standard line of SmartFan fan speed control and alarm products, Control Resources also provides custom fan speed control design and manufacturing services to provide you with the optimum telecom cooling solution for your OEM fan speed control applications.

Product Features – SmartFan Multi SR I2C Fan Speed Control and Alarm for Telecom Cooling

  • Accepts and diode ORs dual power feeds in the range from 36 to 75 VDC
  • Maximum fan current is 4.0 Amps (still air) and 5.0 Amps (200 ft/min air stream) at 55°C
  • Includes soft start and current limiting at start up
  • Supplies voltage to up to six 24 VDC or 48 VDC fans
  • When used with 48 VDC fans, a boost circuit is included that provides voltages greater than the supply voltage when the supply voltage drops below 48 VDC
  • Monitors open collector or voltage source tach pulses from the fans and provides OR’d outputs to drive LED, logic and audible alarms
  • Additional alarm outputs are provided for multiple failure conditions, over temperature conditions, sensor failure, microcontroller failure and loss of power to the Multi SR
  • Provides communication of cooling system status via an I2C bus
  • Narrow 1.50″ width of the board allows for mounting in fan trays as thin as 1U (1.75″) high
  • Agency approvals  telecom cooling fan speed control smartfan multi srul recog4

Selectable Options – SmartFan Multi SR I2C Fan Speed Control and Alarm for Telecom Cooling

  • Jumpers allow user selectable settings of: - Control Temperature - Fan Alarm Trigger Speed - 24 or 48 VDC Operation - Isolated On-Board Power for I2C
  • Accepts temperature (thermistor) inputs from up to three OR’d sensors and provides proportional fan speed control to the fans
  • Fan speed control can also be based on accepting control signals (PWM, DC) or via an I2C bus
  • Sensors
 telecom cooling fan speed control smartfan multi srSmartFan Multi SR dimdw4

Part Numbering System – SmartFan Multi SR I2C Fan Speed Control and Alarm for Telecom Cooling

Part No1 Supply Voltage Range Maximum Watts to Fans2 Number of Fans Number of Temperature Sensors Speed Control Method Isolated 3.3/5.0 VDC Power
200 Ft/Min Still Air
052S4401T06-F 36 to 75 VDC 240 Watts/5.0 Amps 192 Watts/5.0 Amps 6 1 Remote Temperature Based None Supplied
052S4401T16-F Supplied On-Board
H117-F Hardware Pack

1. Part numbers above are RoHS 6/6 compliant. For additional part number options, see table 1 in the Multi-SR Installation & Operation Manual in PDF. 2. Air temperature of 55°C or less.

Stock Product 052S4401T16-F

Manual Pages – SmartFan Multi SR I2C Fan Speed Control for Telecom CoolingOperation/Installation Manual telecom cooling fan speed control smartfan multi srpdf download

Use the links below for addtional manual pages or for a complete manual click on the Operation/Installation Manual PDF link above.
Back to top

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