摘要:
The outer case of the display module 10 is constructed of static dissipative polypropylene components that house a circuit board 16 and display 14. When the display module 10 utilizes the hand held pendant option a front cover 18 is used. This front cover 18 provides a viewing window 20 to the display 14 and a flat surface to attach the membrane 22. When the display module 10 is to be mounted inside of an enclosure, the front cover is replaced by a flat plate 28 that then provides the viewing window 30 and flat surface membrane 32 requirements. The rear portion 12 of the display module 10 is used with either option and contains the necessary features to allow for either the front cover 18 or the flat plate 28 to be attached.
摘要:
A damper unit for an air handling system. The damper unit includes a damper vane to regulate air flow, and a position indicator coupled to the vane. The damper also includes a sensing device that senses when the position indicator passes in close proximity thereto. A controller receives an index signal from the sensing device when the device detects the position indicator, and the controller resets a home position for the vane upon receipt of the index signal. The home position for the vane can be reset upon initialization of the damper and periodically thereafter, such as after each complete revolution of the vane.
摘要:
Off-the-shelf electronic packages eliminate the much of the need for hardware redesign for each product. The base unit has a base plastic housing and a power/communication board. The component module is comprised of a mid-section plastic housing, a common board, a component board, panels with connectors and a housing cover. The component board is unique board to each platform and could be, for example, a fluid control module, a low power temperature control module, a gateway module, a USB module, etc.
摘要:
A damper unit for an air circulation system. The damper unit includes a frame defining an air flow opening, a damper vane for opening and closing the air flow opening, and a stepper motor for turning the damper vane between the open and closed positions. The stepper motor is directly coupled to the damper vane to move the vane between the open and closed positions. A shaft of the stepper motor extends through a frame of the damper unit and is coupled to the damper vane by a hub. A controller is coupled to the stepper motor to control the stepper motor.
摘要:
An actuator is provided having an electric motor that generates a back emf. The actuator also includes a control system for controlling the speed of the electric motor. The control system includes a controller and circuitry for allowing the controller to sample the back emf of the motor. The controller uses the sampled back emf as feedback representative of motor speed for use in controlling the speed of the motor.
摘要:
A damper unit for an air circulation system. The damper unit includes an air flow opening, a damper vane for opening and closing the air flow opening, and a motor for moving the damper vane between the open and closed positions. The damper also includes at least two ports, each port being operable in an input and an output mode. When a control signal is received on one port, the signal is sent out on the other port, and vice versa. The ports can be identical in shape to receive the same shaped plug.
摘要:
A drive circuit including a motor for positioning a damper from a rest position to a stalled position and protect the drive mechanism from damage due to increased current to the drive motor when the damper stalls by including a current limiter to prevent the current in the motor from exceeding a predetermined value.
摘要:
A linear voltage-to-duty cycle converter is disclosed in which an input voltage to be converted is transformed to a triangle wave signal which has up and down ramps whose slopes are variable with the input voltage. A hysteresis comparator receives the triangle wave signal and produces a resulting output signal that has either a high value or a low value depending on the triangle wave signal condition. The time the resultant output signal is high or low compared to the overall time constitutes a duty cycle that is linear with respect to changes in the input voltage.
摘要:
A fluid handling control/monitoring system is divided into a network of modular, intelligent components. These individual components are generally specific to a certain function within the system and contain all the intelligence necessary to perform that function without external guidance. Examples of the different types of components include but are not limited to: human-machine interface (HMI), fluid control, heater control, motor control, field-bus communications and the like. While each type of board is specialized in function, it may control several items of the same nature. For instance, a heater control may be able to control several heaters on one system. Similarly, a fluid board may have the ability to receive input from more than one flow meter and then control fluid flow of more than one point. An example might be a plural component metering and dispensing system where two fluid components have to be combined in a precise mix ratio.