Programming instructions

Appendix B: 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.

Motor curves are available only for variable AC cooling stages on PBx Power

Blocks.

Choosing the correct motor curve

Use the following to determine the correct motor curve for your fan motor.

 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