Toshiba E3 Manual page 23

Note that the actual internal frequency command will be limited by the upper
limit frequency (parameter UL in Gr.F). If the EIII was running at the time of
the communications loss, it will then accelerate to and continuously run at
the upper limit frequency; otherwise it will remain stopped even though the
value of AO #1 has been modified. Similar to the stop command issued to
the EIII by the N2 interface with setting 2 (see above), the value of AO #1 will
not automatically return to its pre-timeout value once proper network
communications are re-established. The NCU must specifically modify the
value of AO #1 once communications are re-established to cause the EIII to
run at the desired frequency once again. Note that in order for this setting to
actually affect the EIII's operating frequency, AO #6 or parameter FMOd in
Gr. U t must be set to 3 (communication interface input valid).
USE EXTREME CAUTION WHEN SELECTING THIS SETTING!
Thoroughly verify that there is no possibility of personal injury or equipment
damage due to the inverter running at the upper limit frequency setting,
especially with the possibly that network communications may not be able to
be re-established in a timely fashion (depending on what network condition
caused the communications timeout in the first place).
Note that the values of AO #12 and AO #13 are non-volatile (stored in the
EIII's EEPROM). Therefore, do not write to these objects more than 10,000
times. In addition, although these values may be changed via the N2
network, the N2 interface uses the values read upon initialization until the EIII
is reset again. Therefore, the EIII must be reset after either of these values
has been changed in order for them to take effect and provide the desired
operation.
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