HVAC custom control system

A fan control system suitable for use in air moving applications comprising:

• a pressure sensor responsive to an air pressure in an air duct for supplying a static pressure signal representative of the air pressure;
• a supply air flow sensor responsive to an air flow in a supply air duct for supplying a supply air flow signal representative of the air flow in the supply air duct;
• a return air flow sensor responsive to an air flow in a return air duct for supplying a return air flow signal representative of the air flow in the return air duct;
• a supply fan for moving air in the supply air duct, said supply fan being driven by a supply fan motor;
• a return fan for moving air in the return air duct, said return fan being driven by a return fan motor;
• and
• a volumetric air flow controller connected to the supply fan and connected to the return fan, said air flow controller for selectively applying a supply drive power signal to the supply fan motor for energizing the supply fan motor and for selectively applying a return drive signal to the return fan motor for energizing the return fan motor, said power drive signals being responsive to the static pressure signal, supply air flow signal, and return air flow signal, and said air flow controller further comprising an anti-windmilling controller for applying a braking signal to the supply fan motor.

A fan control system suitable for use in air moving applications comprising:

• a pressure sensor responsive to an air pressure in an air duct for supplying a static pressure signal representative of the air pressure;
• a supply air flow sensor responsive to an air flow in a supply air duct for supplying a supply air flow signal representative of the air flow in the supply air duct;
• a return air flow sensor responsive to an air flow in a return air duct for supplying a return air flow signal representative of the air flow in the return air duct;
• a supply fan for moving air in the supply air duct, said supply fan being driven by a supply fan motor;
• a return fan for moving air in the return air duct, said return fan being driven by a return fan motor;
• and
• a volumetric air flow controller connected to the supply fan and connected to the return fan, said air flow controller for selectively applying a supply drive power signal to the supply fan motor for energizing the supply fan motor and for selectively applying a return drive signal to the return fan motor for energizing the return fan motor, said power drive signals being responsive to the static pressure signal, supply air flow signal, and return air flow signal, and said air flow controller further comprising an anti-windmilling controller for applying a braking signal to the return fan motor.

A fan control system suitable for use in air moving applications comprising:

• a pressure sensor responsive to an air pressure in an air duct for supplying a static pressure signal representative of the air pressure;
• a supply air flow sensor responsive to an air flow in a supply air duct for supplying a supply air flow signal representative of the air flow in the supply air duct;
• a return air flow sensor responsive to an air flow in a return air duct for supplying a return air flow signal representative of the air flow in the return air duct;
• a supply fan for moving air in the supply air duct, said supply fan being driven by a supply fan motor;
• a return fan for moving air in the return air duct, said return fan being driven by a return fan motor;
• and
• a volumetric air flow controller connected to the supply fan and connected to the return fan, said air flow controller for selectively applying a supply drive power signal to the supply fan motor for energizing the supply fan motor and for selectively applying a return drive signal to the return fan motor for energizing the return fan motor, said power drive signals being responsive to the static pressure signal, supply air flow signal, and return air flow signal, and the volumetric air flow controller being responsive to an adjustable potentiometer for controlling injection braking of the fans to minimize windmilling.

A fan control system suitable for use in air moving applications comprising:

• a pressure sensor responsive to an air pressure in an air duct for supplying a static pressure signal representative of the air pressure;
• a supply air flow sensor responsive to an air flow in a supply air duct for supplying a supply air flow signal representative of the air flow in the supply air duct;
• a return air flow sensor responsive to an air flow in a return air duct for supplying a return air flow signal representative of the air flow in the return air duct;
• a supply fan for moving air in the supply air duct, said supply fan being driven by a supply fan motor;
• a return fan for moving air in the return air duct, said return fan being driven by a return fan motor;
• and
• a volumetric air flow controller connected to the supply fan and connected to the return fan, said air flow controller for selectively applying a supply drive power signal to the supply fan motor for energizing the supply fan motor and for selectively applying a return drive signal to the return fan motor for energizing the return fan motor, said power drive signals being responsive to the static pressure signal, supply air flow signal, and return air flow signal, and said volumetric air flow controller including an open loop motor control for controlling injection braking of the fans to minimize windmilling.