Image Forming Apparatus Miswired Outlet Detection
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Solution Overview
Problem
Image forming apparatuses connected to three-phase four-wire alternating current power supplies can fail due to erroneous wiring in other outlets within a building, causing frame ground potential differences that lead to overheating and failure of interface circuits, as existing testers cannot detect miswired outlets not directly connected to the image forming apparatus.
Innovation Solution
An image forming apparatus equipped with a power supply, communication interface unit, determination circuit, and control unit that identifies miswired outlets by measuring voltage fluctuations in the frame ground and outputs a determination signal to display a warning message when a miswired outlet is detected, preventing potential failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wiring check tester is used to detect miswired outlets, then the detection capability for directly connected outlets is improved, but the tester cannot detect miswired outlets in other locations within the building
Solution Approach 1:
The image forming apparatus performs self-diagnosis by detecting frame ground potential differences caused by miswired outlets anywhere in the building. The apparatus uses its own operational state (communication between PC and apparatus) to sense voltage fluctuations induced by erroneous wiring, eliminating the need for separate testing equipment and expanding detection scope beyond direct connections.
Solution Approach 2:
The invention uses the frame ground voltage as an intermediary signal to detect miswired outlets. Instead of directly measuring outlet wiring conditions, the system measures voltage fluctuations in the shared ground reference, which serve as indirect but reliable indicators of wiring errors anywhere in the building's electrical system.
2Productivity
If the image forming apparatus operates with a miswired outlet in the building, then the apparatus can function normally, but frame ground potential differences cause interface circuit overheating and failure
Solution Approach 1:
The system performs preliminary detection of frame ground potential differences before they can cause interface circuit failure. By continuously monitoring voltage fluctuations during normal operation, the system identifies miswired outlets in advance and can alert users to correct the wiring issue before overheating and failure occur.
Solution Approach 2:
The invention implements a feedback mechanism where the apparatus monitors its own operational environment for voltage fluctuations indicative of miswiring. When potential differences are detected, the system provides feedback through warnings or alerts, enabling users to take corrective action and prevent interface circuit damage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively identifies and warns users of miswired outlets, reducing the risk of interface circuit failures and allowing for corrective action to prevent equipment damage and ensure stable operation.
Implementation Method 1
determine whether or not there is a miswired wall outlet... based on voltage fluctuation of a frame ground
Data Source
AI summary
An image forming apparatus includes a power supply connected to any one of L conductors of a three-phase four-wire alternating current power supply and to a neutral conductor of the three-phase four-wire alternating current power supply, a communication I/F unit connected to another apparatus via a cable, a determination circuit configured to output a determination signal indicating whether or not there is a miswired wall outlet, which includes the neutral conductor and a grounding conductor erroneously connected, in a building, and a control unit configured to display, on a display panel, a message on miswiring when it is identified that the miswired wall outlet is present based on the determination signal.