Modular Safety Relay Circuit Wear Distribution
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Solution Overview
Problem
Existing safety relay circuits in automation systems face challenges in extending the service life of relay modules due to uneven wear of relay contacts, which affects the reliability and safety of machine switching operations.
Innovation Solution
A modular safety relay circuit design featuring at least two relay contacts connected in series, with one contact switching in advance of the other due to a controlled delay, managed by a control unit with a logic module, ensuring uniform wear and adjustable delay settings to optimize switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If one relay contact is used for switching operations, then the switching function is achieved, but the service life is limited due to uneven wear
Solution Approach 1:
The patent combines multiple relay contacts (at least two) in parallel within a single relay module to share the switching load. This merging of contacts allows the wear to be distributed across multiple components rather than concentrated on a single contact, thereby extending the overall service life of the relay module while maintaining reliable switching functionality.
Solution Approach 2:
The patent introduces a delay parameter (switching delay time) that can be adjusted to optimize the switching behavior of relay contacts. By controlling the timing parameters of contact activation and deactivation, the system achieves more uniform wear distribution across contacts while maintaining the required safety response behavior. The delay parameter allows flexible adjustment between response time and service life optimization.
2Speed
If relay contacts are switched simultaneously, then the response time is fast, but the wear is unevenly distributed
Solution Approach 1:
The patent implements dynamic control of relay contact switching through a delay mechanism that can be adjusted based on operational requirements. The switching delay allows flexible timing control where contacts can be activated or deactivated in a controlled sequence rather than simultaneously. This dynamic adjustment enables optimization of both response time and wear distribution by adapting the switching timing to specific operational conditions.
Solution Approach 2:
The patent employs periodic switching of relay contacts with controlled delays between activation and deactivation phases. By implementing periodic action with adjustable delay intervals, the system distributes mechanical stress and wear more evenly across multiple contacts over time, while maintaining the required response speed for safety-critical operations through optimized delay timing.
3Duration of action of stationary object
If delay is introduced for uniform wear, then service life increases, but response time may be affected
Solution Approach 1:
The patent utilizes adjustable delay parameters that can be optimized to achieve the desired balance between service life extension and response time maintenance. By carefully tuning the delay parameter within specific ranges, the system minimizes the time loss while still achieving uniform wear distribution across relay contacts. The parameter adjustment allows optimization for different operational scenarios where either service life or response time may be prioritized.
Data Source
AI summary
To enable an increase in a service life of a modular safety relay circuit, a modular safety relay circuit is provided for the safe switching on and/or off of at least one machine comprising at least one relay module to which the at least one machine is connected, wherein the relay module comprises at least two relay contacts that are connected in series and that can be brought from a first position into a second position and vice versa; and wherein one relay contact switches in advance by a delay of the other relay contact; and a control unit controlling the relay contacts that alternatingly controls the relay contacts in accordance with a state detection of the relay contacts with the delay.