SmartFan Stratus: A Variable Frequency Drive That Provides Precise Variable Speed Control of Single- and Three-Phase Fans, Motors and Pumps

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SmartFan Stratus operates from a 115 or 230 VAC single-phase power supply. Output power is 3 Amps for three-phase motors and 4 Amps for single-phase motors. Motor speed can be based on several control inputs including control signal (4-20mA, 2-10VDC), Temperature (thermistor), 0-18 VDC transducer, or Modbus communication link.

SmartFan Stratus is an economical, yet highly versatile variable frequency drive that provides precise variable speed control of single- and three-phase fans, motors and pumps. Typical VFDs are compatible with more motors, can control to lower speeds, have a more linear control curve and are more energy efficient at reduced speeds than a TRIAC (voltage) based control. This microprocessor based VFD is ideal for applications including environmental control (temperature, humidity, pressure, flow), clean room pressurization, equipment cooling, exhaust ventilation and heating/air conditioning systems. On-board programming allows the setting of many parameters providing maximum flexibility. Special and custom configurations are available.

Benefits of using SmartFan Stratus include acoustical noise reduction, environmental (humidity, temperature or pressure) regulation, greater product reliability, increased fan life, improved safety and energy savings.


Selectable voltage-frequency curve, preset linear and fully programmable

Programmable acceleration and deceleration rates

On-board status LED indicates over current or over temperature condition

Isolated control inputs

Programmable temperature control mode options include:

-One or two remote, OR’d temperature sensors

-Four full speed temperature settings

-Two control temperature slopes

Programmable fan/motor turn off at idle

Agency approvals pending


Input Power: 115 & 230 VAC ±10%, 47-64 Hz, Single Phase

Output Power:

-3 Amp load rated for three-phase output

-4 Amp load rated for single-phase output

Fixed 20 kHz PWM rate

0 to 400 Hz output frequency

Overload current protection

Controls fan/motor speed based on:

-4-20 mA control signal

-2-10 VDC control signal

-Remote temperature sensor (thermistor)

-0-18 VDC transducer (powered from Stratus)

-ModBus communication link

Dual control option (i.e. temperature and humidity)

Storage Temperature: -40°C to 125°C

Ambient Operating Temperature: -20°C to 40°C

About Control Resources: Control Resources has been a leading provider of off-the-shelf and custom electronic controls and alarms since 1984. Control Resources can offer AC Fan and Motor Controls, DC Fan and Motor Controls, Temperature Alarms, Fan Alarms, Fan Trays and Thermal Analysis Services. With in-house ISO 9001 design and manufacturing capabilities, CRI is the One-Stop-Shop for your fan and motor control needs.

For additional information contact:

Jim Quirk at 978-486-4160 X-207


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Jim Quirk
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