AHR 2014 - New York
Booth #759
Jan 21 - Jan 23

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790-ECM(VmA) Series
Electronic Fan Speed Controls

The 790-VmA Series Electronic Fan Speed Controller is designed to provide proportional speed control of new, energy efficient ECM (brushless dc) motors for variable air volume applications. The 790-ECM Series is line voltage independent and requires only a 24 VAC power source.

Motor speed control is accomplished via a pulse width modulated signal from the 790-ECM which drives the ECM motor through it's dedicated control signal input.

The controller modulates the output single pulse width to regulate RPM as determined by a 2–10VDC or 4–20mA DC input signal provided by the customer. The optional 266 PI Interface can also be used to provide a desired setpoint of operation and drive the control as needed.

The 790-VmA Series Controller provides independent “maximum” and “minimum” speed limit adjustments. Also included, a separate continuous minimum speed or “drop out” function at minimum input.

Application

The variable speed controller is used for adjustment of motor RPM within a limited range of operating temperatures that assure adequate operation of the motor. The controller is designed for air moving applications using squirrel cage or propeller type fans. It may be suitable for other, non air-moving, direct drive motor applications.

 

Features and Benefits

     Multi-voltage applications.

     Minimum/Maximum speed adjustments.

     Motor cut-out adjustment.

 

790-ECM Product Data Pressure & Flow Control Application Notes 
Fan Speed Control System
 

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