DESCRIPTION
EVO/
™
ECM-Modbus
The EVO/ECM-Modbus RTU (Remote Terminal Unit)
allows an industrial or building automation system to
monitor and control Electronically Commutated
Motors (ECM) over an industry standard Modbus
RTU serial data link. Each RTU connects to four ECM
Motors.
ECM motors are fractional horsepower blower motors featuring an internal microprocessor to
provide exceptional efficiency, performance, and motor life. The motor may be programmed for
constant airflow or constant torque.
Modbus is an industry standard communications protocol allowing connection to most industrial
and building automation systems.
The EVO/ECM-Modbus RTU allows the automation system to control each motor's output and
on/off; monitor each motor's RPM and control status; and set default values used during power
up and communications interruptions.
A four-conductor low voltage control cable connects each motor to the RTU. Low voltage on/off
control is provided over the control cable by direct connection to the motor. External relays or
starters are not required for ECM Motors.
The EVO/ECM-Modbus RTU allows adjustment of the motor output from 0% to 100% of the
programmed control range. The ECM motor sends a signal from its commutator circuit to the RTU.
The RTU translates this signal to a 0-1500 RPM value.
During operation, the automation system may dynamically change motor outputs, and turn
motors on and off to meet current operating needs. Should communications from the
automation system fail, the EVO/ECM-Modbus RTU can be set to hold the last commanded values
from the automation system or revert to defaults stored in the RTU's non-volatile memory.
Defaults are invoked on power up. Defaults are overridden when communication is established,
and dynamic values sent to the RTU.
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