Appendix F: Motor curves
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Appendix F: Motor curves
Motor curves provide a way to proportionally increase or decrease speed, regardless of motor
manufacturer. For example, a Multifan motor might require 130 VAC to run at 50% RPM, while a
Marathon motor might need 100 VAC to run at 50% RPM. Without a motor curve, the Multifan
motor would run at a slower RPM than the Marathon motor at the same settings.
Selecting the correct motor curve allows you to set, for example, 50 on the control, and get much
closer to 50% RPM on the motor then you would otherwise.
Use manual override or test mode to test and evaluate the operation and
performance of your fan motors. For more information, read
If your fan motors are not running at approximately the correct RPM for the control settings,
find your fan in the following table, and then select the motor curve for your fan manufacturer
and model/specification.
If your fan motor is not listed, use the default motor curve (curve 1). If the default motor curve
does not operate your fan motor correctly, test the motor using manual override or test mode
while selecting the different curves.
Manufacturer
Diameter
(inches)
Model
Specifications
Recommended curve
Aerotech
09
AT09Z2
3350 RPM
2
36
AT36Z1
4
Airstream
12
APP12F
1/4 HP, 1765 RPM
3
36
APP36
4
Baldor
14
1/4 HP, 1700 RPM
4
18
1/3 HP, 1700 RPM
4
24
1/3 HP, 1140 RPM
4
Canarm
09
PLF9
1/5 HP
4
12
PLF12
2
14
PLF14
2
16
PLF16
1/4 HP
2
18
2
Choretime (GE)
12
1/3 HP, 1140 RPM
1
Emerson
12
1/6 HP, 3400 RPM
2
Exafan
10
1/4 HP, 1700 RPM
2
14
1/4 HP, 1700 RPM
2
16
1/3 HP, 1700 RPM
2
18
1/3 HP, 1700 RPM
2
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