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2000
Volume 18, Issue 9
  • ISSN: 2352-0965
  • E-ISSN: 2352-0973

Abstract

Background

The stable, safe, and reliable operation of the electric actuator valve system is crucial in industrial production. However, its faults can lead to production interruptions, equipment damage, and increased costs. Therefore, detecting and analyzing the causes of fault modes is crucial for exploring methods to reduce their occurrence and ensuring the normal operation of electric actuators.

Methods

Taking the IQ20-F14-A electric actuator from Rotork, UK, as a reference, this paper analyzes the causes of the phase loss fault mode from three aspects: software, circuitry, and external conditions. By analyzing and experimentally testing the power supply information extraction circuit, identifying the extraction signal related to phase information, and further comprehensively listing the factors that lead to phase loss faults, the scope is narrowed down through analysis and practical verification.

Results

After investigating potential factors related to component design, circuit design, and connection issues within the circuit, causing a decay of a certain phase voltage on the power line to below the threshold leads to the optocoupler and information-extracting transistors entering a cutoff state, resulting in a phase loss alarm. Additionally, the continuous superposition of typical interference pulse trains on the input voltage for 9 seconds or more also triggers a phase loss alarm.

Conclusion

The fault mode mainly revolves around software, the decay of external supply phase voltage, and the interference of external phase voltage.

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2026-01-07

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Cause Analysis of Rotork Electric Actuator Phase Loss Fault Mode
Recent Advances in Electrical & Electronic Engineering 18, 1559 (2025); https://doi.org/10.2174/0123520965311878241008054235
/content/journals/raeeng/10.2174/0123520965311878241008054235
/content/journals/raeeng/10.2174/0123520965311878241008054235
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  • Article Type:     Research Article
Keyword(s): Electric actuator; fault analysis; information extraction; interference; phase loss; voltage decay

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