Heatcraft Refrigeration Products none E Series Motors with Integrated Variable Speed

E Series Motors with Integrated Variable Speed

E Series units use an EC motor/fan blade combination to provide variable speed condenser control. .All components required to run the motor at variable speeds are built into the motor..

Warning! When connecting the unit to the supply power, dangerous voltages occur. .Do not open the motor within the first 5 minutes after disconnection of all phases..

Be sure that the unit is isolated.

Warning! Dangerous external voltages can be present at terminal KL2 even with the unit turned off..

Warning! With a control voltage fed in or a set speed value being saved, the motor will restart automatically after a power failure..

Speed Adjustment Characteristics

The EC motor varies it’s speed linearly based on a 0-10V input signal. .At 10VDC, the motor runs at full speed. .At 0VDC, the motor turns off. .A chart of the speed control curve is shown below..

The input control signal can be supplied from any controller that outputs a 0-10 VDC signal. .For units with a control signal supplied from a rack control or other external controller, the unit is provided with a terminal board for control signal wiring. . Units with factory installed proportional pressure controls require no installation wiring..

External Control Signal

Contact control manufacturer for setup of external controller to provide 0-10 VDC control signal. .Wire the control signal to terminal board in unit control box. .See Diagram #3 for typical external signal control wiring..

Proportional Pressure Control

Units with factory installed proportional pressure controls use a PI controller to vary the motor speed in order to maintain a constant desired head pressure. .The PI controller has five user adjustable features:

•Head Pressure Setpoint

•Minimum Output

•Throttling range

•Integration constant

•Reverse acting or direct acting mode of operation

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