Labconco Logic+ A2 Technical Manual page 147

2. To verify the PWM measured in step 1 c (above) is correct, access the
submenu from the display. Follow the steps in Figure 13-8 to identify the PWM
signal the microprocessor is sending to the blower motor.
Info
3. Divide the PWM voltage measured in step 1 c (above) by the DC voltage
measured in step 1 b (above). For example, 13.7 volts measured across pins 1
& 10 (PWM line), and 23.7 volts measured across pins 1 & 15. [13.7] / [23.7] =
0.58. This means the PWM signal is 0.58 = 58%. The
displayed under the
[OK/MUTE]
Info screen (above) should match this calculated value.
147
Figure 13-8
C1 - A MODE
10 INCH
AFS
UV LIGHT
CANOPY
REV. D
[UP] [DOWN]
58
SUPPLY
CURRENT / AVG = 1217 / 1219
NEW FILTER / MAX = 1074 / 1450
REV. D
Blower PWM
Tools
Blower
PWM
value