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Sequence of Operation
Nameplate Voltage line voltage is connected to the High Voltage POWER
terminals of the motor at all times. This voltage powers the micro-
processor and the controls that drive the motor; however, the motor will only
operate when there is demand on the Low Voltage Signal connections.
24VAC operation – When using 24VAC, the motor will turn on and off at the
speed selected with a 24VAC input. Multiple low voltage inputs can be sent
to the motor at the same time (if needed) due to the hierarchy built into the
control. Simply stated, multiple terminals can be energized at the same time.
The motor will always operate at the highest speed tap (terminals 1-5) that is
energized. There is no need to isolate one demand input from another.
18VDC operation – When using 18VDC, the motor will turn on and off at the
speed selected with a 18VDC input. Multiple low voltage inputs can be sent
to the motor at the same time (if needed) due to the hierarchy built into the
control. Simply stated, multiple terminals can be energized at the same time.
The motor will always operate at the highest speed tap (terminals 1, 3 or 5)
that is energized. There is no need to isolate one demand input from another.
Variable Speed Torque Control operation – When using a PWM controller
the motor will operate at the selected setting anytime there is a PWM signal
present on terminal 1.
Rotation Sensing
The first time the Evergreen CM is powered up and receives a signal on
one of the “Low Voltage Control Inputs”, it will perform its Rotation Sensing
process. With this feature the motor will automatically determine the proper
operating direction of the blower wheel by running the motor for several
seconds in each direction.
Do not turn off the “High Voltage Power” or the “Low Voltage Control Inputs”
to the motor until the motor continues to run in one direction. During Rotation
Sensing, the motor will run in both directions, up to four times if necessary, to
determine the proper operating direction. If the proper direction cannot be
determined after the forth sequence, the motor will operate in the default
direction of counter clock-wise (CCW).
Once the motor continues to run in one direction, Rotation Sensing is com-
plete and the feature is locked out. The motor will continue to start and run in
this direction without performing Rotation Sensing even if the “High Voltage
Power” is disconnected.
If the final operating direction of the motor is not the proper direction for the
blower wheel, refer to the “Troubleshooting Guidelines” on page 14; “Wrong
Rotation”.
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