Toshiba Q9+ Installation & Operation Manual page 138

Time Limit For Lower-Limit Frequency Operation
Program Fundamental  Frequency Settings
This parameter sets the time that the ASD is allowed to operate
below the Lower-Limit setting before an alarm and subsequent
fault is incurred.
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Direct Access Parameter Information
Q9 Plus ASD Install/Op Manual
F260
Direct Access Number —
Parameter Type — Numerical
Factory Default — 0.0
Changeable During Run — Yes
Minimum — 0.0
Maximum — 600.0
Units — Seconds
https://www.toshiba.com/tic/
F256