GE ECM™ Motor Application The EVO/ECM-ACU+ control allows industry standard 0-10Vdc controllers to adjust and monitor General Electric’s ECM 2.3 Motor. These are fractional horsepower air moving motors featuring an internal microprocessor. The design provides exceptional efficiency, performance and motor life. The motor may be factory configured to provide constant mass airflow or constant torque. The EVO/ECM-ACU+ allows remote adjustment of the output from 0% to 100% of the programmed control range. A lamp on the control continuously flashes out the flow index (percent of the programmed control range), so instruments are not required to read the value. The "P" version provides ON/OFF control by switching the motor's "GO" control when the input signal drops below the 2 volt (4 mA) operating point. Specifications Power NEC Class II Only 24 Vac ± 20% 50/60 Hz 2 W, 4 VA + 1VA/Motor Control Signal "O" Version
0-10 Vdc = 1% to 100% "P" Version 2-10Vdc = 0-100% 4-20mA = 0-100% ON/OFF Control Between 1 & 2 Vdc (2 & 4 mA)
RPM Signal 0-10 Vdc, 10 mA max. 0 to 2,000 ACU+64% Outputs Go & VSpd 24 Vdc @ 20 mA Vspd Supports ECM Autoswitch Function Thermal Stability >0.01%/oF Operating 0oF to 130 oF (-18oC to 55oC) Environment 10-80% rh Connections 1/4 Tabs, Terminal Strip Or Combination
EVO/ECM-ACU+-OR-C
Ordering EVO/ECM-ACU+-“ab”-“c”-„d“ “a” Insert “P” for on/off control via control signal Insert “O” for no on/off control “b” Insert “S” for lamp on component side Insert “R” for lamp on reverse “c” Add MP for control mounted to a metal plate. “d” Add C for contractor wired version (shown) Standard version (no C) has all push on tabs for connections. Operation The green lamp continuously indicates the flow index. After a pause, the lamp flashes out the tens digit, then the units digit of a number (percent) between 1 and 99. Two extra long flashes indicate a flow index of 0%. Long flashes represent the tens digit, and short flashes represent the units digit. A
shorts. The lamp flashes the signal that was present when the flash sequence started. Mounting Mount the control inside a metal control cabinet or enclosure. Fasten the control mounting posts to a earthed metal surface. Mount the control with clearance for the 24Vac power wires and control cable connector. Mount the control so the signal lamps are visible. Use the “R” version to mount the lamp through the enclosure wall. The control’s motor cable connector is small so it may be carefully pulled through an empty 3/4” conduit. Wiring Power the EVO/ECM-ACU+ controller with a 24Vac NEC Class II USA power source. Observe all code requirements and follow all safety practices regarding low voltage power supplies and circuits to insure a safe, reliable installation. Earth one side of the power source. Connect the neutral connection to the earthed side of the 24 Vac Class II power source. Some applications may require an isolated power supply or alternative earthing scheme. Follow code requirements and observe all safety practices concerning unearthed low voltage circuits. Connect the 24Vac 50/60Hz connection to the hot side of the 24 Vac Class II power source. When applying the "O" version, you may interrupt this connection as a means to stop the ECM Motor
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Many automation controllers will power the control directly from an on/off output. The signal input is single-ended, so power neutral and signal common are internally connected. Connect the 0-10 Vdc control signal to the Signal connection. Connect the control signal common to the Neutral connection. The input presents a 21K ohm load to the signal source. Include this resistance when calculating a dropping resistor for 4-20 Ma operation. A 511 ohm 1% resistor or precision 512.82 ohm resistor provides a 500 ohm dropping resistance. Connect to the motor using an EVO/ECM-CBL motor control cable.
