6
-26
Setting Example
An example of stall prevention during deceleration when L3-04 is set to 1 as shown below.
Fig 6.25 Stall Prevention During Deceleration Operation
Setting Precautions
• The stall prevention level during deceleration differs depending on the Inverter capacity. Refer to the fol-
lowing table for details.
• When using the braking option (braking resistor, Braking Resistor Units, and Braking Units), be sure to set
constant L3-04 to 0 or 3.
• When an OV (main circuit overvoltage) is detected by setting L3-04 to 0 (invalid) with the braking option
enabled, set L3-04 to 3.
• The setting of L3-04 is ignored for flux vector control or open-loop vector 2 control.
Preventing Overvoltage by Automatically Reducing the Regenerative
Torque Limit (Overvoltage Inhibit Function, PRG 102 only)
The overvoltage inhibit function is a function that, by reducing the regenerative torque limit to a value less
than its set value according to the main circuit voltage level, suppresses voltage rises with regenerative torque.
Using this function means that if, for example, the main circuit voltage rises during deceleration, the regener-
ative torque limit will be reduced and so the deceleration rate will be reduced automatically, suppressing rises
in the main circuit voltage.
This function is effective for suppressing overvoltages that occur during stabilization after an overshoot fol-
lowing sudden acceleration. This function differs from the stall prevention during deceleration function in this
respect.
This function is enabled during vector control.
Inverter Capacity Stall Prevention Level during Deceleration (V)
200 V Class 380
400 V Class
E1-01 ≥ 400 V 760
E1-01 < 400 V 660
Deceleration time controlled to
prevent overvoltage
Deceleration time
(set value)
Time
Output frequency
TOE-S616-60.1.book 26 ページ ２０１７年８月４日 金曜日 午後３時４１分
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