Configurable Safety Relay Input Current Adjustment
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Solution Overview
Problem
Conventional safety relays have a fixed rated input current, which can lead to reliability issues when monitoring a large number of safety input devices due to increased load, causing intermittent disconnection of machine power even if all devices are in a safe state, and result in excessive power consumption when fewer devices are present, thus compromising between reliability and energy efficiency.
Innovation Solution
A configurable safety relay with an interface component that allows users to set programmable input current levels for each safety input, enabling customization of input current to match specific safety circuits or applications, ensuring reliable monitoring while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed rated input current is used in conventional safety relays, then the device structure is simple, but the reliability deteriorates when monitoring a large number of safety input devices due to increased load causing intermittent disconnection
Solution Approach 1:
The patent applies dynamics by making the input current configurable rather than fixed. The safety relay allows users to program different input current levels (e.g., 2mA, 5mA, 10mA, 20mA) based on the number of safety input devices connected. This dynamic adjustment capability ensures reliable operation whether monitoring a few or many devices, resolving the reliability issue without requiring multiple different relay models.
Solution Approach 2:
The patent changes the electrical parameter of input current from a fixed value to a configurable parameter. By allowing users to select and program appropriate current levels based on their specific application requirements (number of devices, wiring configuration), the system adapts to different load conditions and maintains reliability across various operating scenarios.
2Loss of energy
If a fixed rated input current is used in conventional safety relays, then the device complexity is low, but the power consumption increases excessively when fewer safety devices are present
Solution Approach 1:
The configurable input current feature allows the relay to dynamically adapt its power consumption characteristics to match the actual number of connected safety devices. Users can program lower current values when fewer devices are connected, thereby reducing unnecessary power consumption while maintaining adequate monitoring capability for the actual load.
Solution Approach 2:
By changing the input current parameter from fixed to variable, users can optimize power consumption based on their specific application. When monitoring fewer safety devices, lower current settings reduce energy waste, while still providing sufficient signal strength for reliable detection, thus improving energy efficiency without adding complex hardware.
3Reliability
If a fixed rated input current is used in conventional safety relays, then the device is easy to manufacture, but it causes intermittent disconnection of machine power when monitoring a large number of safety input devices
Solution Approach 1:
The patent resolves the manufacturing complexity issue by implementing a software-based configuration approach rather than requiring multiple hardware variants. A single relay model can be programmed with different input current settings to suit various application scales, from monitoring a few to many safety devices. This eliminates the need to manufacture and stock multiple different relay models, simplifying the manufacturing process while ensuring reliable operation across all scenarios.
Data Source
AI summary
A configurable industrial safety relay device allows individual adjustment of rated input currents for each safety input. The safety relay device can support a number of programmable configuration settings or parameters, including parameters that allow a desired input current to be individually selected for each safety input. In this way, an input current can be selected for each safety input that is appropriate for the safety circuit being monitored by the safety input. In particular, an input current can be selected that ensures reliable detection of the safety signal by the safety input while substantially minimizing power consumption by the safety relay device.