HVAC Actuator Running Time Control via Remote Bus Adjustment
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Solution Overview
Problem
Existing actuator systems in HVAC applications face challenges with adjustable auxiliary switch setpoints, fixed hysteresis, and non-programmable running times, making it difficult to adapt to changing application requirements and requiring physical intervention for settings, especially in hard-to-reach locations.
Innovation Solution
The actuator system allows for remote configuration of auxiliary switch setpoints and programmable running times via a communications bus, using a Sylk bus for two-wire, polarity-insensitive communication, enabling real-time adjustments and onboard diagnostics, and accessible address selection through a potentiometer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If physical adjustment of running time is made at the actuator location, then the running time can be set, but it requires physical intervention which is difficult when the actuator is in hard-to-reach locations
Solution Approach 1:
The patent replaces the mechanical/physical adjustment system with an electronic communication system. A processor in the actuator receives communication signals from an external device via a communication bus, allowing running time parameters to be adjusted remotely without physical access to the actuator's adjustment mechanisms.
Solution Approach 2:
The patent introduces a communication bus as an intermediary between the external control device and the actuator's processor. This intermediary enables parameter adjustment without requiring direct physical access to the actuator, solving the problem of hard-to-reach locations.
2Adaptability or versatility
If fixed hysteresis is used in the actuator system, then the system is simpler to manufacture, but it cannot adapt to changing application requirements
Solution Approach 1:
The patent makes the actuator's parameters dynamic and programmable rather than fixed. The processor can be programmed with different running time parameters and hysteresis values to adapt to various application requirements, transforming a static system into a flexible, adaptable one.
Solution Approach 2:
The patent enables changes in system parameters (running time, hysteresis) through programming the processor. Different parameter sets can be loaded to match different application requirements, allowing the same actuator hardware to serve multiple purposes with varying performance characteristics.
3Ease of operation
If remote configuration via communication bus is implemented, then adjustments can be made remotely without physical access, but the device complexity increases
Solution Approach 1:
The patent integrates a communication bus interface into the actuator's processor, enabling the same processing unit to handle both control functions and configuration functions. This multi-functionality reduces the need for separate dedicated hardware for remote configuration, mitigating the increase in device complexity.
Data Source
AI summary
An actuator system having an actuator with a rotatable shaft. The shaft may have a first running time to rotate from a first position to a second position in one direction. The shaft may have a second running time to rotate from a first position to a second position in another direction. The first and second running times may be separately adjustable. A motor may be connected through a gear train to the rotatable shaft. A processor may control a rotation of the motor and thus the running times of the shaft. The running times may be adjusted with signals to the processor from a remote controller connected to the processor via a communications bus.