© 2006
GE ECM
by Regal-Beloit
- 34 -
Indoor Blower Motors
v0.2
PWM (Pulse Width Modulation) Mode
(Premium ECM Model 2.3)
This form of communication or signal is best suited for commercial systems although
some OEM’s have, and are currently using it in residential applications. This is
suitable for full variable speed control of the motor by use of an external PWM
signal.
PWM simply uses two signals, a start/stop signal and a PWM signal.
-
In simple terms the start/stop does exactly what it says, it provides the motor
with the information of when to turn on and when to turn off. However, it also
gives the value that will be used for the percentage of airflow.
-
The PWM signal is the information for the percentage of programmed airflow.
Or to say that another way, it represents the desired motor output.
OEM charts are used to select demand airflow, delays, de-humidification option and
continuous fan option.
There are no climate profiles in PWM mode. The OEM can provide fixed and
adjustable on and off delays
A de-humidification call simply reduces the airflow percentage of demand to the
motor.
OEM Zoning systems can control airflow per zone. The manufacturer can set up the
motor to provide different levels of airflow depending on the demand and the size of
the zone.
Since this is strictly OEM specific, the manufacturer’s literature must be consulted for
set-up options and troubleshooting.
Pin number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Connected to PWM common
NC*
Connected to PWM common
NC*
NC*
NC*
NC*
NC*
NC*
PWM signal
NC*
NC*
NC*
NC*
Start/Stop signal: 9 - 23VDC
NC*
* Not Connected
Pin number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Connected to PWM common
NC*
Connected to PWM common
NC*
NC*
NC*
NC*
NC*
NC*
PWM signal
NC*
NC*
NC*
NC*
Start/Stop signal: 9 - 23VDC
NC*
* Not Connected
ECM 2.3
Motor Control
PWM (Duty Cycle)
D
T
+23 V
+9 V
0 V