Control System with Detachable Pendant Emergency Stop Circuit
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Solution Overview
Problem
Existing control systems with detachable pendants require turning off power or putting the control apparatus in an emergency stop condition to safely disconnect or connect the pendant, which is time-consuming and labor-intensive, and may result in the emergency stop switch on the pendant being disabled even when power is on, preventing necessary stops.
Innovation Solution
A control system with an emergency stop circuit, a detach-ready setting switch, and a connection state monitoring unit that enables safe connection and disconnection of the pendant by disabling the emergency stop circuit when in detach mode and monitoring the connection state to prevent accidental disabling of the emergency stop switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pendant is made detachable for flexible connection to multiple control apparatus, then adaptability is improved, but the emergency stop function may be disabled when power is on, reducing reliability
Solution Approach 1:
The emergency stop circuit's operational state is dynamically changed based on the connection status of the pendant. When the pendant is disconnected, the system automatically transitions the emergency stop circuit to an inactive state, preventing false activation. This dynamic adaptation resolves the contradiction by making the system's safety function responsive to the actual operational context.
Solution Approach 2:
The connection state monitoring unit continuously monitors whether the pendant is connected or disconnected and provides feedback to the emergency stop circuit. This feedback mechanism enables the system to automatically adjust the emergency stop function's status, ensuring it remains reliable only when the pendant is properly connected, thus resolving the reliability issue while maintaining detachable flexibility.
2Reliability
If the emergency stop circuit is kept active during pendant connection/disconnection operations, then safety is improved, but accidental activation or false stops occur, reducing ease of operation
Solution Approach 1:
The emergency stop circuit's state is dynamically adjusted based on real-time connection monitoring. During pendant connection or disconnection operations, when no pendant is detected, the circuit automatically becomes inactive, preventing false activation. This dynamic behavior eliminates the need for operators to manually switch modes, greatly improving ease of operation while maintaining safety when the pendant is properly connected.
Solution Approach 2:
The system automatically monitors its own connection state and self-adjusts the emergency stop circuit's operational status without requiring manual intervention from the operator. This self-service mechanism prevents accidental activation during connection operations while maintaining safety during normal operation, resolving the contradiction between safety and ease of operation.
3Reliability
If power must be turned off or emergency stop activated before disconnecting the pendant, then safety is improved, but time and labor are increased, reducing productivity
Solution Approach 1:
The system automatically monitors the pendant's connection state and self-manages the emergency stop circuit's status. When the pendant is disconnected, the system automatically deactivates the emergency stop function without requiring the operator to manually turn off power or activate emergency stop. This self-service capability eliminates time-consuming manual operations while ensuring safety, directly improving productivity.
Solution Approach 2:
The connection state monitoring unit provides continuous feedback about pendant connection status to the emergency stop circuit. This feedback enables automatic deactivation of the emergency stop function when the pendant is disconnected, eliminating the need for manual power switching operations. The result is safe automatic operation that significantly improves the efficiency of pendant connection and disconnection operations.
Data Source
AI summary
A control system (100) comprises a control apparatus (2) for controlling a driven body, and a pendant (1) having an emergency stop switch (11), wherein the control apparatus (2) includes an emergency stop circuit (21) which causes the operation of the driven body to stop when the emergency stop switch (11) is operated, a detach-ready setting switch (23) which switches detach-ready setting information to “detach mode” when connecting or disconnecting the pendant (1) to or from the control apparatus (2) and otherwise to “normal mode”, and a connection state monitoring unit (24) which sends information concerning the connection state of the pendant (1) to the emergency stop circuit (21), and wherein the control apparatus (2) disables the operation of the emergency stop circuit (21) when the detach-ready setting information is set to “detach mode” and when the pendant (1) is disconnected from the control apparatus (2).