<Toc> <4. Troubleshooting and Maintenance>
4-3
IM 05D01D02-41E 4th Edition: May 31, 2006-00
■ If a Power Failure Occurs during Operation
● Momentary Power Failures shorter than 20 ms
The controller is not affected at all and continues normal operation.
● Power Failures of 20 ms or longer
• The alarm function of the controller continues to work normally. (Alarms with the
stand-by feature temporarily return to their stand-by state, however.)
• Setting parameters that have already been configured retain their settings.
• Auto-tuning is cancelled.
• After recovery from a power failure, control action resumes in the same mode as the
one before the occurrence of the power failure. The control output begins with the
preset output value.
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