SmartFan^® Stratus

Variable Frequency AC Fan Speed Control drive

Fig. 1: Stratus Variable Frequency AC Fan Speed Control Model 240F400

Fig. 2: Stratus Variable Frequency AC Fan Speed Control Model with Cover
Model 240F400E

	Stratus Variable Frequency AC Fan Speed Control for Motors, Fans and Pumps

The SmartFan Stratus variable frequency AC Fan Speed Control drive is an economical, yet highly versatile drive that provides precise variable speed control of single- and three-phase AC motors for fans, motors and pumps. A typical VFD drive is compatible with more motors, can control to lower speeds, has a more linear control curve and is more energy efficient at reduced speeds than a TRIAC (voltage) based control. This microprocessor based VFD drive 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 variable speed control configurations are available.

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

CAUTION: SmartFan AC motor speed controls are designed for OEM (Original Equipment Manufacturers) and are not intended for end-user or after-market applications. SmartFan AC motor speed controls should only be used with compatible induction motors: Permanent Split Capacitor (PSC) or Shaded Pole. All AC motors must be approved by the motor manufacturer or thoroughly validated prior to use. Attempting to control a fan or motor that is not compatible could cause excessive heating and/or permanent damage to the motor.

The use of Inverter duty grade motors is highly recommended when using a VFD. To avoid bearing pitting and insulation breakdown on motors that are not inverter grade, the use of a LC filter connected to the output of the VFD is required.

Control Comparison & Motor Efficiency
See technical article on how the Stratus AC motor speed control
compares to other controller technologies.

	Stratus Variable Frequency AC Fan Speed Control Product Features

Selectable voltage-frequency curve, preset linear and fully programmable
Programmable acceleration and deceleration rates
On-board status/fault LEDs and remote alarm signal indicate loss of control signal, over temperature or over current conditions
Isolated control inputs
Programmable temperature control mode options:

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

	Stratus Variable Frequency AC Fan Speed Control Selectable Options

Input Power: 115 & 230 VAC ±10%
47-64 Hz
Single Phase
Output Power: 1 kW load rated for three-phase output
800 Watts load rated for single-phase @ 240 VAC
400 Watts load rated for single-phase @ 120 VAC
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

OEM AC Fan Speed Control - SmartFan Stratus

	Stratus Variable Frequency AC Fan Speed Control Part Numbers

Nimbus

Control Mode

Enclosure

240F400

240F402

240F400E

240F402E

240F411

0-10VDC, 0-20mA, Remote Temperature Sensor, Remote Transducer, MODBUS

MODBUS Only (50 piece minimum order)

0-10VDC, 0-20mA, Remote Temperature Sensor, Remote Transducer, MODBUS

MODBUS Only (50 piece minimum order)

Stratus for higher torque requirements (taller capacitors make unit 4" tall)

Yes

Not Available

When used in the temperature or remote transducer control mode, a sensor (sold separately) is required.
Choose an air, surface or liquid temperature sensor from the CRI catalog or via your own transducer.

For MODBUS communications support, try the following links: