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6 Vector Control
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
6-5 Torque Limit Function
6
6-5-2 Torque LADSTOP Function Settings
• The following figure shows the Torque Limit 1 to 4 (b041 to b044) when the Torque Limit Selection
(b040) is set to 00 (Four-quadrant separate setting).
• When the Torque Limit Selection (b040) is set to 01 (Terminal switching), the Torque Limit 1 to 4
(b041 to b044) switched by the torque limit switching 1 and 2 functions allocated to two of the
multi-function input terminals are defined as follows.
Example. When TRQ1 (torque limit switching 1) and TRQ2 (torque limit switching 2) are allocated
to multi-function input terminals S7 and S8, respectively (C007 =41, C008 =42)
• To use the torque limit function in a low speed range, also use the overload limit function.
• Use this function to stop temporarily the frequency acceleration/deceleration function (LAD) when the
torque limit function is activated.
The torque limit function is enabled when the 1st/2nd Control Method (A044/A244) is set to 03
(Sensorless vector control), 04 (0-Hz sensorless vector control, or 05 (Sensor vector control).
LAD functions to calculate transient frequency reference value to enable the motor to reach the
reference frequency in the set acceleration/deceleration time.
• This function stops temporarily the frequency reference at the transient value calculated by LAD
when it reaches the torque limit and restarts at that frequency when the torque limit is reset.
This enables the motor to run smoothly after the reset of the torque limit, which prevents overloading.
6-5-2 Torque LADSTOP Function Settings
Parameter No. Function name Data Default data Unit
b045
Torque LADSTOP
Selection
00: Disabled
01: Enabled
00 –
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