35
ECM motor control methods
There are three main control methods to control the speed
of electronically commutated motor (ECM) for desirable air-
flow for a given application.
3-discrete speed input, potentiometer field speed
adjustment — This method uses the ECM with potenti-
ometer field adjustment. The relay board will have three
main circuits for HI, MEDIUM, and LOW speed. Each of
these speeds can be adjusted by potentiometer to any value
in the motor’s operating range. This will allow the custom-
ization of air flow on each speed of the fan coil unit to bet-
ter suit any requirements.
4-discrete speed input, potentiometer field speed
adjustment, solid state (only with 24-v controls by
other option) — This is the same as 3-discrete speed in-
put but with additional fourth speed. All 4 speeds can be
adjusted by potentiometer to any value in the motor’s
operating range.
Control method no. 3 — ECM variable speed (only
with 24-v controls by other option) — This method
requires 0 to 10-v signal for fan speed. It has no predeter-
mined fan speeds and will ramp the motor fan speed ac-
cording to the controller used on the fan coil unit. All ECM
motor packages use a constant torque operating mode. An
ETO request is required for pricing and availability of con-
stant airflow operation.
L2
LOW
MED
HIGH
VR1
VR2
VR3
K1
K2
K3
LOW
MED
HIGH
COM
C1
C2
C3
CR1
Com
Flo4
Flo3Flo2
Flo1
FloCom
Neutral
24Vac
EVO/ECM
Status
Flo3Flo2
Flo1
Flo4
Flo0
45pd-51
+5V
3-DISCRETE SPEED INPUT
4-DISCRETE SPEED INPUT
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