Fire Mode 9-1
AC30 series Variable Speed Drive
Chapter 9: Fire Mode
Caution
When Fire Mode is active the Drive and Motor protection trips are disabled. The use of Fire Mode itself increases the risk of causing a fire by
overloading the drive or motor, so it must only be used after assessing the risks.
Intended Use
Fire mode is intended for use in critical situations where it is imperative for the motor to be kept running if at all possible. In such a situation it may
be reasonable to override the drive’s normal protective functions. An example of a critical situation may be a ventilation fan in a stairwell, where
continued operation in the event of a fire may assist the safe evacuation of personnel.
Summary
When Fire Mode is enabled the drive firmware attempts to keep the drive running wherever possible. If the drive was running when Fire Mode
was activated it will continue to run. If the drive was stopped when Fire Mode was activated then the Fire Mode firmware will attempt to start it.
While Fire Mode is enabled the majority of trips will be ignored, (possibly leading to damage to the drive, motor or attached equipment). If one of
the remaining enabled trips does occur then the Fire Mode firmware will wait until the trip source has become inactive and will then restart the
drive.
When Fire Mode is deactivated the drive will return to its previous sequencing mode. If the drive was running in Local mode the motor will be
stopped. If the drive was running in remote terminals or remote communications mode the drive will continue running according to the relevant
control word, (refer to Appendix B).
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